Installing a smart lock is a manageable DIY project for many homeowners. Most smart deadbolts are designed to fit standard door preparations and install with a screwdriver. Taking time to measure and check alignment helps avoid frustration.
This guide covers general steps for installing a replacement smart deadbolt and a retrofit smart lock. Always follow your lock’s specific instructions, since designs differ. Renters should get landlord permission first. See smart locks for renters.
Before You Buy: Measure Your Door
Door Thickness
Many residential smart locks fit doors around 1-3/8 to 1-3/4 inches thick. Check the lock’s specifications.
Backset
The backset is the distance from the edge of the door to the center of the deadbolt hole. Common backsets are 2-3/8 inches and 2-3/4 inches. Many locks include adjustable latches.
Bore Hole Diameter
The main hole through the door face is often 2-1/8 inches for standard deadbolts.
Latch Hole
The hole in the door edge is often 1 inch in diameter.
Clearance
Check space around the lock for the interior assembly, especially near door handles, trim or storm doors.
Many manufacturers offer printable templates or online compatibility checkers.
Tools You May Need
- Phillips screwdriver
- Tape measure
- Pencil
- Drill and bits (only if modifying the door)
- Chisel (if adjusting the strike plate)
- Level
Check Door Alignment First
Smart locks with motors can struggle if the deadbolt does not move freely.
- Close the door and lock the existing deadbolt by hand.
- The bolt should slide smoothly without pushing or pulling the door.
- If it sticks, adjust the strike plate or hinges before installing the smart lock.
Misalignment is a common cause of jamming and battery drain.
Installing a Replacement Smart Deadbolt
Step 1: Remove the Existing Deadbolt
- Unlock the door.
- Unscrew the interior thumbturn assembly.
- Remove the exterior cylinder.
- Unscrew and remove the latch from the door edge.
Keep all parts in a labeled bag, especially if you might restore them later.
Step 2: Install the New Latch
- Adjust the latch to the correct backset if needed.
- Insert the latch into the door edge, oriented according to the instructions.
- Secure it with screws.
Step 3: Install the Exterior Assembly
- Feed any cable through the bore hole.
- Align the tailpiece with the latch.
- Hold it in place.
Step 4: Install the Mounting Plate and Interior Assembly
- Attach the mounting plate on the interior side.
- Connect any cables.
- Attach the interior assembly and secure it.
Step 5: Install the Strike Plate
Replace the strike plate if the new lock includes one. Use long screws that reach into the door frame stud if the instructions recommend it, which can improve resistance to forced entry.
Step 6: Install Batteries
Use the battery type recommended by the manufacturer.
Installing a Retrofit Smart Lock
Retrofit locks replace only the interior thumbturn.
- Remove the interior thumbturn while keeping the exterior cylinder in place.
- Attach the mounting plate with the original screws or included screws.
- Install the adapter that fits your deadbolt’s tailpiece.
- Attach the smart lock to the mounting plate.
- Install batteries.
App Setup
- Download the manufacturer’s app or use your smart home platform’s app.
- Create or sign in to your account with a strong password and two-factor authentication. See how to secure your smart home.
- Add the lock following on-screen instructions. Matter locks can often be added by scanning a Matter code. See Matter explained.
- Calibrate the lock so it learns locked and unlocked positions and door handedness.
- Update the firmware.
Configure Features
- Auto-lock: Set a delay that suits your household.
- Auto-unlock: Consider security trade-offs.
- User codes: Create codes for household members and temporary codes for guests.
- Notifications: Choose alerts for lock and unlock events.
- Door sensor: Install and calibrate if included.
- Voice control: Require a PIN for voice unlocking.
Testing
- Lock and unlock many times with the door open and closed.
- Test the keypad, app, physical key and voice control.
- Test auto-lock.
- Confirm notifications.
Troubleshooting
Lock Jams or Stalls
Check door alignment and strike plate. Make sure the bolt moves freely.
Connection Issues
Move your hub or router closer, add a Wi-Fi bridge or Thread border router, or check for interference.
Fast Battery Drain
Often caused by misalignment, weak connections or frequent use. Check alignment and connectivity.
Wrong Lock Direction
Recalibrate in the app.
When to Call a Professional
Consider a locksmith or handyperson if:
- Your door needs new holes or significant modifications
- The door or frame is damaged
- You have a nonstandard door
- You are not comfortable with the installation
Questions to Ask Before You Start
- Do your door’s thickness, backset and bore hole match the lock’s specifications?
- Does your existing deadbolt slide freely with the door closed?
- Will you need a bridge, hub or border router for remote access?
- Do you have the original key and parts stored safely?
Caring for Your Smart Lock
- Clean the keypad with a soft, dry or slightly damp cloth. Avoid harsh chemicals.
- Check the bolt periodically for smooth movement, especially when seasons change and doors swell or shrink.
- Replace batteries promptly when the app warns you.
- Review user codes every few months and delete ones that are no longer needed.
- Lubricate only with products the manufacturer recommends, since some lubricants attract dirt.
Weather Considerations
Exterior keypads face rain, sun and cold. Check the lock’s weather rating, and note that very cold temperatures can shorten battery life. A storm door or overhang offers some protection.
Choosing Between Replacement and Retrofit
Replacement locks often add a keypad and fully replace the deadbolt, while retrofit locks keep your existing keys and exterior hardware. Retrofit models are usually simpler for renters, while replacement models suit homeowners who want keypad entry.
Sharing Access Safely
Give each person their own code rather than sharing one code across the household. This makes activity logs meaningful and lets you remove one person’s access without changing everyone else’s. For cleaners, dog walkers or contractors, use scheduled or temporary codes that only work during set times.
Frequently Asked Questions
Can I install a smart lock myself?
Many people can, especially on standard doors. Follow the instructions closely.
How long does installation take?
It varies by lock and experience. Allow extra time for alignment adjustments.
Do I need to drill holes?
Usually not for standard door preparations. Nonstandard doors may require modifications.
What if the lock jams?
Check door alignment and strike plate, and recalibrate.
Should I keep my old lock?
Yes, especially renters who need to restore the original hardware.
The Bottom Line
Measure your door, check alignment and follow the manufacturer’s instructions carefully when installing a smart lock. Secure your account, calibrate and test thoroughly, and call a professional for nonstandard doors or modifications.
Editorial note: Gadget Nestly is independent and reader-supported. This guide is based on research into manufacturer documentation, published specifications and widely accepted best practices; we have not been paid to mention any product. If we add affiliate links in the future, they will be clearly disclosed per our Affiliate Disclosure.