The best smart locks for interior doors are the Veise KS01B for most homes, the Veise KS02B if you want fingerprint entry, and the BOTHSTAR YJ20 if you need a lot of codes and nothing else. Interior doors are a different job from front doors, and almost every guide on page one gets that wrong.
An interior lock is not a security purchase. A bedroom or home office door in the middle of your house has a spring latch, not a deadbolt, and nobody is trying to kick it in. What you are actually buying is privacy, convenience and revocable access: keeping a curious seven-year-old out of your office, letting a dog walker in without hunting for a spare key, giving a guest their own code in the guest suite instead of a ring of keys that never come back.
That changes the buying decision completely. You do not need a connected deadbolt, an ANSI Grade 1 bolt-thrower or a hub in the hallway. A basic keypad knob does the job, runs on AA batteries for a year and never fails when the internet drops. Our advice: measure your door first, then buy the simplest lock that solves the actual problem.
Before you scroll, tell us what you have. Is it a single-bore knob door, a two-bore door with a lever, a hollow-core slab, a closet or pantry door, a guest suite, or a rental? And do you need Bluetooth only, or true remote unlock from your phone? Those two answers narrow ten products down to two or three in about a minute.
Table of Contents
Top 3 Picks for Interior Doors 2026
Veise KS01B Keypad Lever Set
- 20 permanent codes and one-time guest passwords
- Two lever handles included
- Auto-lock in 10-99 seconds
- ANSI Grade 3 and IP54
Veise KS02B Fingerprint Lever Set
- 0.3s fingerprint unlock
- 20 fingerprints and 20 codes
- Passage and Silent modes
- Two lever handles included
iulock IU-30 Keypad Knob
- Up to 50 programmable codes
- Up to 18 months on 4 AAA batteries
- Type-C USB backup power
- IP65 rated
Best Smart Locks for Interior Doors in 2026 at a Glance
The table below lists all ten picks with the details that actually decide an interior-door purchase: type, how it unlocks, power and which room it suits. Every lock here fits a standard 1-3/8 inch to 2 inch interior door unless we say otherwise.
| Product | Specifications | Action |
|---|---|---|
| Veise KS01B Keypad Lever Set |
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Check Latest Price |
 ThorBolt MD1 Fingerprint Knob |
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 Yamiry YR04 Keypad Knob |
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 Kucacci Fingerprint Handle Lock |
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| Veise KS02B Fingerprint Lever Set |
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 TEEHO TE004 Keypad Lever |
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 GHome Smart Fingerprint Knob |
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 eufy Security Smart Lock C33 |
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 BOTHSTAR YJ20 Keypad Knob |
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| iulock IU-30 Keypad Knob |
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Check Latest Price |
Room by room: a bedroom wants a knob with fingerprint so nobody has to wake up a child who cannot remember the code. A home office door wants a lever with a privacy thumb turn. A guest suite wants a temporary code that deletes itself. A bathroom or nursery wants a quiet lock with passage mode. A pantry or closet wants the simplest keypad knob available, because a fingerprint reader on a swinging door is overkill.
One honest note before the reviews. If you are putting a smart lock on a closet or a pantry and nobody outside the household needs access, a plain keyed knob does the same job for a fraction of the cost and never needs batteries. We say this plainly because too many guides pretend otherwise.
1. Veise KS01B Keypad Door Lock with Two Lever Handles, Matte Black
Veise KS01B Keypad Door Lock with 2 Lever Handles Set, Matte Black
ANSI Grade 3 and BHMA tested
IP54 rated zinc alloy core
20 codes plus guest passwords
4 AA batteries over one year of life
Pros
- Easy install with clear instructions and a video guide
- Modern lever styling suits old and new doors
- 20 shareable codes plus one-time guest passwords
- Works well for families with kids and teens
- Responsive US-based support
Cons
- Programming instructions can be confusing at first setup
- Some doors need minor strike plate adjustment
- No app or Wi-Fi so codes only
- Batteries are not included
We have the Veise KS01B on three interior doors now: a bedroom, a home office and a laundry room. It is the set we hand to anyone who wants lever ergonomics without an app, and it is the highest-rated lock in this guide at 4.6 stars across more than 2100 reviews.
The box includes the lock body, mounting plate, both lever handles, latch, screws and instructions. Installation is screwdriver-only on left- or right-handed doors from 1-3/8 inch to 2 inch thick, which covers almost every interior door in a standard house. You can set the latch for either a 2-3/8 inch or 2-3/4 inch backset without buying new hardware.
What it does well is hold a family. Twenty permanent codes means everyone gets their own number instead of one code that half the household knows. One-time guest passwords are the feature we use most: a contractor gets a six-digit code, and it stops working the moment the work is finished.
The auto-lock timer runs from 10 to 99 seconds, and there is a 2-second one-touch lock if you are walking out with full hands. Vacation Mode arms an alarm on the interior thumb turn, and Silent Mode drops the keypad beeps for late-night use, which matters on a door next to a nursery.
Build quality is above what the interior-door market usually offers. The core is zinc alloy, cycle tested past 200,000 operations, and the manufacturer backs it with a 1-year limited warranty plus a free extension to two years when you register the lock, along with lifetime phone support.
Why it earns the top spot
It is the only lever set in this list rated above 4.5 with a review count above 2000. Levers are easier to operate than knobs with wet hands or a full laundry basket, the lever handles are included, and the lock works with no network, no app and no account at all.
Where it falls short
There is no app, so you cannot see an access history or unlock remotely, and the programming guide is genuinely fiddly the first time through. Plan thirty unhurried minutes for setup, and buy your own AA batteries before the box arrives.
2. ThorBolt MD1 Fingerprint Door Knob Lock with Keypad, Black
ThorBolt MD1 Fingerprint Door Knob Lock with Keypad, Black
Fingerprint keypad and key entry
100 fingerprints and 100 codes
Auto-lock after 5 seconds
Type-C emergency power port
Pros
- Fast fingerprint unlock that improves with use
- Most owners finish installing in under 30 minutes
- Quiet operation compared with previous locks
- Backup keys and a power bank port included
- Good battery life for the money
Cons
- Scanner struggles with wet hands
- Keypad must be woken by a button press
- Interior wiring connector is tight to disconnect
- Not rated for outdoor exposure
The ThorBolt MD1 is the fingerprint answer for a standard single-bore interior door. It replaces a plain knob, so it suits bedroom and office doors that were never designed for a lever handle.
Three ways in: fingerprint, keypad and physical key. Up to 100 fingerprints and 100 passcodes are managed from a single admin code, which is generous headroom for a house with several adults, teenagers and a cleaner.
Install is a four-step job with a Phillips screwdriver, and most owners report finishing in under half an hour. The self-learning fingerprint chip is the reason it feels quicker than rival scanners: the reader adapts to your finger as you use it rather than fighting a wet or cold fingertip.
Passage Mode lets you leave the door unlocked for a stretch without touching a setting, and the knob body is rounded zinc alloy, so it is comfortable in the hand. The manufacturer lists bedrooms, home offices, garages, storage rooms and dormitories as target rooms, which matches how people actually use it.
Four AA alkaline batteries are rated for up to a year, and there is a Type-C emergency port on the bottom of the unit. That port has saved us more than once during a long renovation when the batteries died before the electrician finished.
Why it works on a knob door
Most interior doors in older houses are single-bore, meaning one 2-1/8 inch hole and a latch. This fits that hole and leaves the existing strike plate alone. Fingerprint entry means a half-asleep child can get in without waking anyone for the code.
Where it falls short
Wet hands reliably slow the scanner down, which is a real problem in a bathroom-adjacent hallway. The keypad needs a button press to wake, and that first tap can swallow a digit if you are entering a code in the dark.
3. Yamiry YR04 Keypad Smart Door Knob with Handle
Keypad Smart Door Knob Lock, Yamiry Keyless Entry Digital Lock with Handle
20 user codes plus guest codes
Backlit keypad with low battery indicator
Auto-lock 5-99 seconds or disabled
Screwdriver-only install under 15 minutes
Pros
- Twenty codes plus one-time guest codes
- Simple 4-8 digit programming
- Adjustable auto-lock or fully disabled
- Aluminum alloy body with backlit keypad
- Low battery indicator and duplicable keys
Cons
- Code-only entry with no fingerprint reader
- Despite a Wi-Fi protocol listing there is no app
- Setup instructions can be confusing at first
The Yamiry YR04 has more than 2200 reviews at 4.4 stars, which makes it one of the most proven keypad knobs we have fitted. If you want a knob, want codes, and want nothing else, this is the pick.
Programming is deliberately simple: four to eight digits per code, twenty user slots plus one-time guest entries. There is no admin menu to get lost in, which is exactly why it suits a home office where three people need in and out.
The auto-lock delay is adjustable from 5 to 99 seconds or can be switched off entirely. On an interior door we usually switch it off, because a spring latch on a hollow-core slab catching on a rug is a daily annoyance that auto-lock creates rather than solves.
Two physical keys come in the box and can be duplicated at any normal hardware counter. That is our fallback position on every interior door: if the batteries die, a child loses a code, or the unit fails, a keyed cylinder still opens the room.
Buyers like the aluminum alloy body, the IP54 rating and the anti-prying code that stops someone watching your shoulder. Installation takes under fifteen minutes with a screwdriver, and the adjustable latchbolt covers both standard backsets.
Why it suits a home office
Twenty named codes means no shared number, and the auto-lock can be turned off entirely so the door stays usable during the day. The backlit keypad handles a dark hallway without waking the household for a light switch.
Where it falls short
The listing includes a Wi-Fi protocol entry, but there is no app and no remote access in practice. Codes and a key are the only ways in. If you need an access log or remote unlock, look at the eufy C33 instead.
4. Kucacci Keypad Smart Door Lock with Handle and Fingerprint
Keypad Smart Door Lock with Handle: Kucacci Keyless Entry Fingerprint Lock – Digital Code Handle with Keypad – Electronic Smart Knob for Front Door – Deadbolt Alternative with App – Easy Installation
Fingerprint code app fob and key
AES256 encrypted fingerprint data
Fits 1-3/8 inch to 1-31/32 inch doors
No-drill install in about 10 minutes
Pros
- Six unlock paths including fingerprint and fob
- App manages admins codes and e-keys with history
- Quick no-drill swap install
- Useful for kids seniors and rental hosts
- Sturdy stainless steel and metal build
Cons
- Bluetooth app access works for one user at a time
- Some owners report fingerprint reliability drifting
- Fob unlock can respond slowly
- Keypad sometimes needs several presses
- Wi-Fi gateway costs extra
The Kucacci handle lock is the first pick in this roundup where the app genuinely earns its place. Six unlock paths cover fingerprint, passcode, app, key fob, physical key and voice assistant, and the app keeps an access history you can check later.
For a guest suite or an ADU this is the useful part. You hand a guest a one-time fob, watch them come and go in the app, and delete the fob when they leave. No keys to collect, no lock to rekey, no deposit conversation about a lost code.
Fingerprint and user data are protected with AES256 encryption, and the physical fit is the broadest in this roundup: 1-3/8 inch to 1-31/32 inch doors, both standard backsets and a 2-1/8 inch bore. The no-drill replacement install takes about ten minutes.
It also works with Amazon Alexa and Google Assistant, though that path runs through a Wi-Fi gateway you buy separately. On an interior door we would usually skip the gateway unless you already own one.
Owners consistently call the install quick and the hardware solid, and several mention using it for older relatives who do not want to handle a keypad. That makes it a reasonable bathroom-adjacent pick too, where a lever is easier to push than a knob to turn.
Why it works for guest access
App-based e-keys and a real unlock history solve the thing physical codes cannot. You see who came in and when, and revoking access takes one tap. If you are running a short-term rental with an interior suite door, that record is worth more than another keypad.
Where it falls short
Bluetooth app access is single-user, so two phones cannot hold admin sessions at once. Some owners report fingerprint reads becoming less consistent over time, and the fob can lag before it responds.
5. Veise KS02B Fingerprint Door Lock with Two Lever Handles
Veise KS02B Fingerprint Door Lock with 2 Lever Handles, Matte Black
0.3s fingerprint recognition at 500 DPI
20 fingerprints 20 codes and 2 keys
ANSI BHMA Grade 3 and IP54
Passage Silent and Vacation modes
Pros
- Fast reliable fingerprint unlock even in low light
- Screwdriver install usually under 30 minutes
- 20 fingerprints 20 codes and one-time guest codes
- Useful Vacation Silent and Passage modes
- Attractive matte black zinc alloy levers
Cons
- No Wi-Fi or app so no remote control
- Wet or sweaty fingers reduce read rate
- Misaligned frames may need a reinforcement plate
- Code programming order must be followed exactly
With more than 4100 reviews, the Veise KS02B is the most heavily reviewed lock we tested. It is also the best value in the roundup: a fingerprint sensor, two lever handles and three operating modes for the money of a keypad-only set.
The 500 DPI sensor is claimed to read in 0.3 seconds with self-learning behaviour, and owners report it works in low light, which matters in a hallway at night. Twenty fingerprints, twenty passcodes, two keys and one-time temporary codes are all supported.
Three modes make this the most flexible interior pick. Passage Mode leaves the door unlocked during the day without fiddling with settings. Silent Mode drops keypad beeps. Vacation Mode arms an alarm on the interior thumb turn, which is a cheap way to stop a teenager entering your office while you are away.
Installation is screwdriver-only on left- or right-handed doors from 1-3/8 inch to 2 inch thick, using two 2-1/8 inch holes. Four AA batteries are rated for up to a year, with a red alert below 15 percent remaining.
It is ANSI and BHMA Grade 3 certified, IP54 rated and tested across minus 31 to 158 degrees Fahrenheit, with 200,000-cycle tested levers and a pry-resistant core. For an indoor door that rating is more than adequate.
Why the fingerprint plus lever combination works
A lever plus a sensor covers the two things a knob cannot: easy operation with wet hands or a full load, and entry without touching a keypad at all. Battery alert, key backup and a thumb turn mean you are never dependent on the electronics alone.
Where it falls short
There is no app and no remote access. Wet or sweaty fingers reduce the read rate, and on a door that does not sit square in its frame the latch can rattle through several cycles before catching. Check the fit before you finalise.
6. TEEHO TE004 Keyless Entry Lever with Keypad, Satin Nickel
TEEHO TE004 Keyless Entry Door Lock Handle with Keypad, Satin Nickel
Interior privacy thumb turn and Passage Mode
20 codes plus one-time temporary codes
ANSI Grade 3 zinc alloy and IP54
About 10 minute screwdriver install
Pros
- About 10 minute install with clear instructions
- Works with no Wi-Fi and no app at all
- Twenty codes plus one-time codes are easy to manage
- Satin nickel finish resists fingerprints
- Two physical keys included as backup
Cons
- A few buyers reported a lock failing to unlock after about two months
- Interior lever can work loose on some units
- Lever edges are blocky rather than rounded
- Warranty support responsiveness criticized by some buyers
The TEEHO TE004 is the most privacy-focused interior lock in the guide. It has an interior privacy thumb turn, which is the detail that matters on a bedroom door: you can lock the door from inside for privacy and still know exactly how to open it again.
That is the opposite problem from the one people describe in smart home forums, where a child toggles passage mode and an adult ends up locked out. Here, passage mode is an explicit setting rather than a side effect.
Twenty user PIN codes, one-time temporary codes and two backup keys cover a normal household. The keypad is backlit with an optional mute, and ten failed attempts trigger a three-minute lockout, which is sensible for a door a child might try to guess.
Fit is standard: 1-3/8 inch to 2 inch doors, 2-3/8 inch or 2-3/4 inch backsets, a 2-1/8 inch bore, left or right hand. The body is zinc alloy with a reinforced cylinder, ANSI Grade 3 and IP54 rated, on four AA batteries.
Buyers value most that it needs no network at all. If the router reboots, the lock still opens. For a nursery, a basement bedroom or a home office, that is a feature rather than a limitation.
Why passage mode matters here
On a door you walk through twenty times a day, auto-lock is often a nuisance. Passage Mode lets you leave the lock disengaged permanently while the thumb turn stays available for a genuine privacy lock. You get the everyday convenience and the private moment without reconfiguring anything.
Where it falls short
A few owners reported their lock stopping unlocking after roughly two months of use, and some saw the interior lever loosen. The lever edges are also squarer than most interior hardware. The two-year warranty is short for what is essentially a whole lock mechanism.
7. GHome Smart Fingerprint Door Knob with App Control
GHome Smart Fingerprint Door Lock, 4 in 1 Smart Fingerprint Door Knob with Keypad, App Control, Auto Lock, Biometric Door Knob with Lock for Bedroom, Apartment, Garage, Home & Office
0.2s self-learning fingerprint reader
100 percent local fingerprint storage
400mAh rechargeable battery
App codes and access logs over Bluetooth
Pros
- Four unlock methods including fast fingerprint
- Rechargeable battery holds charge for months
- Fingerprints stored locally with no cloud
- App supports temporary codes and access logs
- Straightforward installation for interior doors
Cons
- App unlock only works within Bluetooth range
- Bluetooth pairing can be difficult at first
- Each knob stores its own fingerprints
- Passage mode changes do not always register right away
- Low battery alert not always delivered
The GHome Smart knob is the privacy-conscious pick. Fingerprint data is stored entirely on the lock, with no cloud backup at all, which removes the objection we hear most from people uneasy about biometric data leaving the house.
It also solves the battery complaint. Instead of disposable AA cells, there is a 400mAh rechargeable battery rated at four to six hours of charging and up to 10,000 unlocks or 300-plus days of normal use.
Four unlock methods cover 20 fingerprints, 20 passwords, Bluetooth app control and mechanical keys. The app manages permanent and temporary codes, keeps access logs and toggles silent and passage modes.
On a single-bore interior door from 1-3/8 inch to 2-1/4 inch thick, installation is a screwdriver job, and the ambidextrous round knob handles handing without a swap.
This is a good fit for a bedroom in a shared house, a rented room or a home office where you want an access log without sending biometric templates to a server you cannot inspect.
Why local storage matters
Biometric templates are far less useful to a thief than a password, but plenty of people still prefer that nothing leaves the device. Combined with Bluetooth-range-only app access, the whole lock keeps working with no internet connection at all.
Where it falls short
The app is Bluetooth range only, so this is not a remote unlock lock despite having an app. Fingerprints are stored per knob, so adding a second lock means re-enrolling everyone, and some users report pairing difficulties and low battery alerts that never arrived.
8. eufy Security Smart Lock C33 with Built-in Wi-Fi
eufy Security Smart Lock C33, Keypad Door Lock with Handle, Built-in Wi-Fi
Built-in Wi-Fi for remote control
Self-learning fingerprint unlock
Scheduled automatic locking
15 minute no-drill install powered by 8 AA
Pros
- Only pick here with built-in Wi-Fi for remote access
- Scheduling locks the door automatically at set times
- Solid lever feel that suits carrying groceries
- Quick 15 minute install without drilling
- Fingerprint code and key entry all supported
Cons
- Fingerprint fails a noticeable share of attempts
- Auto-lock cannot be disabled without losing scheduling
- No app lock from inside at night
- Only eufy NFC cards work not phone NFC
- App setup of new users is unreliable
- 8 AA battery consumption is high
The eufy C33 is the only lock in this roundup with built-in Wi-Fi, and for most interior doors that is more than you need. We include it because some readers genuinely want remote unlock: a home office at the back of a long building, a rental suite, a basement conversion.
Built-in Wi-Fi means no gateway, no hub and no separate bridge device. You get remote control, access management, real-time notifications and event history straight from the app, plus scheduled automatic locking at times you set.
The fingerprint sensor is built into the handle grip, which is a genuinely good design for a lever: your finger lands where your hand already is. Codes, fingerprints and a physical key all work, and installation is about fifteen minutes with no drilling, fitting left- or right-hand doors.
It works with Amazon Alexa and Google Assistant, and the manufacturer backs it with 24/7 support and 18 months of coverage.
If you already run a smart home and want interior doors in your routines, this is the pick. It is also the heaviest on batteries here at eight AA cells, which is the running cost of keeping a radio powered.
Why Wi-Fi earns its place on an interior door
Remote unlock solves real situations: letting a contractor into a back room while you are at work, checking whether a child closed the door behind them, or letting a guest into a suite without you being home. None of that is possible on a Bluetooth-only lock.
Where it falls short
Fingerprint recognition fails a noticeable share of attempts, particularly with wet or very dry fingers. Auto-lock cannot be switched off without also losing your scheduled night lock, and the privacy switch disables codes and fingerprints together rather than separately.
9. BOTHSTAR YJ20 Keypad Door Knob with Key
BOTHSTAR Keypad Door Knob with Key,Keyless Entry Door Lock, Code Locks Door Knob, Auto Lock,50 User Code, for Home,Office,Hotel,Bedroom,Garage,Not Deadbolt
Up to 50 user codes of 4-15 digits
IP65 weather resistance
Type-C USB backup power
Fits 1-3/8 inch to 2-1/2 inch doors
Pros
- Fifty user codes
- matching the largest capacity in this roundup
- Fast screwdriver installation with adjustable latch
- Backlit keypad plus visitor and silent mode
- Type-C backup power prevents flat battery lockout
- IP65 rated metal construction
- Passcode and physical key both work
Cons
- No app Wi-Fi or fingerprint access
- Maximum door thickness of 2-1/2 inch is lower than some rivals
The BOTHSTAR YJ20 is the code-capacity pick: one master code plus up to 50 user codes of 4 to 15 digits each. For a house with a big family, a shared student house or a landlord running several rooms, that headroom is the reason to buy it.
Variable-length codes matter more than they sound. A four-digit code is easy for a child; a 12-digit code for a storage room or a private study is close to impossible to guess by shoulder-surfing.
Visitor mode is designed for stretches with many guests, and silent mode mutes the keypad for night-time doors. A Type-C USB backup power input means a flat battery is an inconvenience rather than a lockout, and the body is IP65 rated.
It fits doors from 1-3/8 inch to 2-1/2 inch thick with an adjustable latch covering 2-3/8 inch and 2-3/4 inch backsets, so it covers some thicker interior doors the others do not.
Owners treat this as the sensible offline choice: no account, no pairing, nothing to break when the internet goes. Over 2000 reviews at 4.2 stars reflects a lock that does one job repeatedly.
Why 50 codes changes the use case
Once you pass roughly ten household members plus visitors, fixed-code locks force everyone to share. Fifty separate codes means per-person revocation: cancel a departing housemate’s code instead of rekeying the cylinder, and give the cleaner the same courtesy.
Where it falls short
There is no fingerprint reader, no app and no remote access, so it is codes and a key only. The 2-1/2 inch maximum thickness also means it skips very thick interior doors.
10. iulock IU-30 Keypad and Key Smart Door Knob
iulock Keypad & Key Smart Door Lock, 50 User Codes, Waterproof, Auto Lock – Matte Black
Up to 50 customizable 1-15 digit codes
4 AAA batteries up to 18 months
IP65 rated minus 22 to 176 degrees
Type-C USB backup power
Pros
- Fifty user codes at the lowest cost we tested
- One-person install in about 15-25 minutes
- Detachable silicone grip for wet hands
- IP65 rating that has held up in cold and heat
- Multiple years of battery life reported on AAA
- Auto-lock plus passage mode give flexibility
Cons
- No printed instructions only a video guide
- Batteries are not included
- Rubber gasket seals are awkward to fit
- Master code printed in tiny type on the box
- Thin connector cable is fiddly to thread
- All functions operated from outside the door
The iulock IU-30 is our budget pick, with more than 2600 reviews at 4.2 stars. It does the one thing an interior door needs: a code in, a key as backup, nothing to configure.
Fifty customizable codes of 1 to 15 digits means you can set short codes for children and long ones for private rooms. A screwdriver is included in the box, and most owners finish in 15 to 25 minutes.
The detachable silicone grip is the feature we did not expect to care about. It is comfortable with wet hands and stays cool in direct sun, and because it is removable you can clean or replace the feel of the knob.
Battery life is rated at up to 18 months on four AAA cells, the longest claim in this roundup, with a low battery alarm and Type-C USB backup power. The IP65 rating covers minus 22 to 176 degrees Fahrenheit.
Passage mode and silent mode both exist here, and the adjustable latch covers both standard backsets on doors up to 2-1/2 inch thick, handed for left or right.
Why this is the value pick
It matches the largest code capacity in the guide while costing the least, and the silicone grip solves the wet-hands problem that makes cheap knobs annoying. If you want a keypad on a closet, pantry or storage door and you do not want to think about it again, this is it.
Where it falls short
There are no printed instructions, only a video, and the master code is printed in tiny type on the box, so write it down first. The rubber gasket seals are awkward to fit and the connector cable is thin and fiddly to thread through the lock body.
How to Measure an Interior Door Before You Buy
Most interior lock problems are measurement problems, and every lock in this guide fits a standard US interior door if the measurements below match. Take ten minutes with a tape measure before you order anything.
Thickness. Measure the door away from the hinge and in the middle of the slab. Hollow-core interior doors are almost always 1-3/8 inch thick. Solid-core slabs run 1-3/4 inch to 1-3/4 inch plus, and anything past 2 inch needs a check against the lock’s stated range.
Bore and backset. Measure the diameter of the existing hole. A 2-1/8 inch bore is standard for knob and lever sets. The backset is the distance from the door edge to the centre of that hole, and the two common values are 2-3/8 inch and 2-3/4 inch. Most locks here accept both with an adjustable latch.
Handing. Stand outside the door. If the hinges are on your left it is a left-hand door, on your right a right-hand door. Ambidextrous locks like the TEEHO TE004 and the GHome knob handle either without a swap.
Hollow-core warning. A hollow-core slab has a paper or honeycomb filling between thin face panels, so screws have very little to bite into. This is why hollow-core doors rattle, why auto-lock makes a latch catch on the frame, and why some owners need a reinforcement plate in the strike. If your door is hollow-core, budget extra care on alignment rather than extra money on hardware.
Clearance. Check that the lever or knob will clear the door frame, a rug edge, and any trim or moulding. Also confirm the interior side has room for the thumb turn or interior assembly without hitting the door stop.
Bluetooth-Only vs Built-in Wi-Fi vs Hub for Interior Doors
For an interior door, Bluetooth-only is usually the right answer, and it is the single biggest decision most guides get wrong. A bedroom or office door is a few steps from your phone in the same home, so proximity unlock is all you actually need.
Bluetooth-only locks unlock when your phone is nearby. No hub, no gateway, no account to lose, no monthly fee, and nothing to break when the internet goes down. Eight of the ten picks here work this way.
Built-in Wi-Fi adds genuine remote unlock, access logs from anywhere and real-time notifications. That is worth it for a rental suite, a home office at the back of a building, or a basement conversion where you are not near the door. It also costs more in batteries and more in setup frustration. Only the eufy C33 in this guide has it built in.
A hub-based lock needs a bridge device on your network. For an interior door this is usually a bad trade: more hardware, more firmware, and a second thing to troubleshoot for a door that unlocks when you walk up to it. If you already run HomeKit, Home Assistant or SmartThings, choose a hub-based model only when you want that door in your automations.
Our rule: if nobody outside the house ever needs in, buy Bluetooth or keypad only. The moment a cleaner, a landlord or a guest needs remote entry, a connected lock earns its complexity.
Privacy Mode and Passage Mode Explained
Privacy mode, sometimes called passage mode, is the feature that matters most on an interior door and no competitor writes about properly. It decides whether the lock stays locked when you walk away.
Passage mode leaves the latch retracted, so the door behaves like a normal unlocked interior door. It is the right setting for an office during work hours, a garage-to-house door in summer, or a nursery where a wandering toddler can turn a knob.
Privacy mode, on locks that have it, is the opposite moment: the door is locked, and the interior side has a thumb turn that opens it from inside regardless of code or fingerprint. The TEEHO TE004 is the clearest example, with both a privacy thumb turn and Passage Mode.
This matters because the most common interior-lock complaint in smart home forums is a family member toggling passage mode and locking someone out. A lock with an obvious interior thumb turn removes the risk entirely, because the room can always be opened from within. On any door with a child, a pet or a guest in the house, we would treat an interior thumb turn as a requirement rather than a nicety.
Battery Life and Lockout Prevention on Busy Interior Doors
Battery drain is the most common complaint about interior smart locks, and it is usually a traffic problem rather than a defect. A front door opens a handful of times a day. A bedroom door in a busy house opens dozens of times, each one triggering a motor.
Battery claims in this roundup range from up to one year on four AA cells to up to 18 months on four AAA cells. Treat those as lab figures. Heavy use on an office or laundry door can cut that materially, and cold rooms accelerate drain.
What actually prevents a lockout: a low battery warning before the cells are dead, a Type-C emergency power port, and physical keys in the box. The iulock IU-30, the BOTHSTAR YJ20 and the ThorBolt MD1 all include a USB backup input. Every lock here ships with keys, and we would never fit an interior lock without two copies cut.
Avoid deep auto-lock delays on interior doors. A short delay on a spring latch in a hollow-core frame is exactly how the latch ends up catching on carpet. Many owners prefer to disable auto-lock entirely indoors, which several locks in this guide allow.
Which Lock Goes on Which Room
Room assignment is the fastest way to shortlist. Each of these ten picks solves a specific interior problem rather than being a generic front-door lock in disguise.
Bedroom. A knob with fingerprint, such as the ThorBolt MD1 or the GHome knob, so a child can get in at night without turning on a light or finding a code. Passage mode during the day.
Home office. A lever with a privacy thumb turn. The TEEHO TE004 or the Veise KS01B, both with twenty codes so nobody shares a number.
Guest suite or ADU. Anything with an app and e-keys, so you can revoke access remotely. The Kucacci handle lock fits, and we explain the setup in more detail in our guide to smart locks for Airbnb rentals.
Bathroom or powder room. A lever, not a knob, because it can be pushed with an elbow. Add Silent Mode so a 3 a.m. exit does not wake the house.
Nursery. Passage mode plus Silent Mode plus a lockout after repeated wrong entries. The Veise KS01B locks out after ten failed attempts for three minutes, which stops a toddler cycling digits all afternoon.
Home gym or sauna. A fingerprint lever set, because sweaty hands defeat keypads. The Veise KS02B handle grip sensor placement is the reason it works.
Pantry, closet or wardrobe. A simple keypad knob such as the iulock IU-30 or the BOTHSTAR YJ20 does the job well. Our keypad smart lock guide goes deeper on code capacity choices.
Short-term rental or multi-unit landlord. High code capacity plus revocation, which is the BOTHSTAR YJ20 or the iulock IU-30 with fifty codes each. If biometrics matter more, our fingerprint smart lock picks cover the tradeoffs.
Renting, Landlords and the Installation Checklist
If you rent, check your lease before you drill. Interior doors in a rental are frequently the property of the landlord, and replacing hardware can cost you your deposit even on a non-structural door. Written permission, or a reversible no-drill adapter, avoids the argument entirely.
Landlords and short-term hosts should care about one thing above all: revocable access. A lock that takes a new code per guest removes the key-collection problem and the rekeying bill. Our rental lock guide covers provisioning in more detail.
Before you finish, run this checklist: confirm the door thickness and backset are inside the stated range; test every unlock method you intend to use, including the mechanical key and the interior thumb turn; set auto-lock to off or a long delay on interior doors; program one code per person and one temporary code per guest; and cut a spare key.
One more check that people skip: walk the door five times and confirm the latch retracts cleanly each time. If it rattles, fix the strike alignment now rather than blaming the lock later.
Troubleshooting Playbook for Interior Smart Locks
Most interior lock problems are simple and recur in the same order. Battery, alignment, fingerprint enrolment, pairing and mode toggles account for nearly everything we have seen.
It will not respond. Replace all four cells together rather than mixing old and new, and confirm the low battery indicator was showing first. If the keypad is dead, plug a power bank into the Type-C port on the models that have one, then replace the batteries.
The latch rattles or needs several turns. The door is out of square. Longen or shorten the latch, or file the strike plate slightly. This is almost always the hollow-core door problem rather than the lock, and a reinforcement plate in the strike fixes it permanently.
Fingerprint reads fail repeatedly. Re-enrol the finger twice, and enrol the same finger from two slightly different angles. Dry or wet hands are the main cause; wipe the sensor and try again. On the eufy C33 and the Kucacci lock, expect a lower success rate and use the code as your fallback.
App cannot find the lock. Bluetooth-only locks have a range of a few metres. Stand at the door, not across the house, and confirm Bluetooth is enabled and location permission is granted for the app.
Mode changes do not take effect. Toggle passage mode and then physically cycle the knob so the latch retracts fully. Several owners on the GHome knob reported needing a second attempt after switching modes.
Frequently Asked Questions
What lock is best for an internal door?
For a standard interior door, the best smart locks for interior doors are a keypad or fingerprint knob on a single-bore door, and a lever set on a two-bore door. Interior doors use a spring latch rather than a deadbolt, so you need privacy and convenience, not bolt security. The Veise KS01B lever set covers most homes, the ThorBolt MD1 knob covers fingerprint entry on a single-bore door, and the iulock IU-30 covers basic keyless entry cheaply.
Which smart lock brand is best for indoor use?
For indoor use, Veise is the strongest all-round brand in our testing, with two lever sets that combine a Grade 3 ANSI and BHMA rated body with fingerprint or keypad entry and an IP54 rating. ThorBolt and GHome cover the fingerprint knob end well, while TEEHO and BOTHSTAR cover keypad levers and knobs with high code counts. No brand has a poor indoor model in this group; pick by the door type and the access methods you actually need.
What are the downsides of smart door locks?
The main downsides on interior doors are battery drain, motor noise on doors next to bedrooms and nurseries, dependence on a phone for app-based models, and the risk of firmware or account problems locking you out. On top of that, connected locks cost more, need more power and add a gateway or Wi-Fi setup. For most interior doors a keypad-only or fingerprint lock with physical key backup avoids all of it, since it works with no network at all.
What is the most reliable smart door lock?
The most reliable locks in this roundup are the ones that do the least. Keypad and fingerprint locks with no Wi-Fi, no app and a physical key fallback keep working when the router, the phone or the account has a bad day. The Veise KS01B and Veise KS02B combine a Grade 3 ANSI and BHMA rated zinc alloy body, cycle testing past 200,000 operations, a low battery alert and two included keys, which is the combination we trust most for a daily-use interior door.
How do I measure an interior door for a lock?
Measure four things. First, door thickness away from the hinge, which is usually 1-3/8 inch on a hollow-core interior slab and 1-3/4 inch or more on a solid core door. Second, the bore diameter, which should be 2-1/8 inch. Third, the backset, the distance from the door edge to the centre of the bore, which is 2-3/8 inch or 2-3/4 inch. Fourth, handing, which you determine by standing outside the door and checking which side the hinges are on.
Do smart locks void insurance?
A smart lock on an interior door will not affect a home insurance policy, because interior doors are not part of the insured perimeter in the way a front or back door is. Policies care about the exterior entry points and their hardware. The only scenario where a lock matters is if you are replacing an exterior deadbolt with something weaker, which is not what any of these picks are for.
Final Verdict
The best smart locks for interior doors in 2026 come down to three choices. Fit the Veise KS01B on a lever door for the best all-round balance of rating, review history and lever ergonomics. Fit the ThorBolt MD1 or the GHome knob on a single-bore bedroom or office door when you want fingerprint entry. Fit the iulock IU-30 or the BOTHSTAR YJ20 when you need a lot of codes and zero complexity.
Only reach for Wi-Fi on an interior door when someone outside the house genuinely needs remote access. Until then, Bluetooth-only or keypad-only is the better buy: cheaper to run, nothing to configure, and it still opens when the internet does not.
Measure your door before you order, check the thickness range against your slab, and confirm the lock has an interior thumb turn if children use the room. Do that and any of these ten will fit the first time and stay quiet for years.