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How to Install a Smart Lock on Your Front Door

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Black keypad smart lock installed on a wooden front door with a screwdriver on the doorstep

Installing a smart lock is one of the easier upgrades you can make to your front door. Most models replace your existing deadbolt using a screwdriver, and the job usually takes less than an hour. This guide shows how to check that a lock fits your door, install it step by step, and set it up so it works reliably.

Before you buy: check your door

Most smart locks fit standard doors, but measure first. Look for these specs on the lock's product page and compare them with your door:

  • Door thickness: typically 1-3/8 inches to 2 inches (35 to 51 mm).
  • Backset: the distance from the door's edge to the center of the main hole. 2-3/8 inches and 2-3/4 inches are the two common sizes, and many locks adjust to either.
  • Face hole: usually 2-1/8 inches, with 1-1/2 inches also seen on older doors.
  • Edge (latch) hole: usually 1 inch.

If your door already has a deadbolt, these holes exist. If not, you will need to drill them, which is a bigger job.

Choose a connection type

  • Bluetooth only: works when you are nearby. Simple and battery-friendly.
  • Wi-Fi: lets you control it from anywhere without a hub, but uses more battery.
  • Z-Wave or Zigbee: needs a compatible hub and works well with smart home systems.
  • Thread or Matter: newer standards that aim to work across brands.

Pick the one that fits your existing setup. Our guide to Alexa, Google Home and HomeKit security can help you choose.

Tools you need

  • A Phillips-head screwdriver (a flat-head helps for prying).
  • Batteries for the lock, often 4 AA.
  • Your phone with the lock's app installed.
  • A tape measure.

Step-by-step installation

1. Remove the old deadbolt

Unscrew the interior thumb-turn and the exterior cylinder, then pull the old latch out of the edge of the door. Keep the door open the whole time you work.

2. Install the latch

Slide the new latch into the edge hole. Make sure the slanted side of the bolt faces the door frame, and adjust the backset if your lock supports both sizes. Screw it in.

3. Fit the strike plate

Mount the strike plate on the door frame. Use the longer screws that go into the frame stud for strength. A weak strike plate undermines any lock, smart or not. Our guide to physical home security explains how to reinforce doors and frames.

4. Mount the exterior part

Feed the connecting cable through the door, route it under the latch, and attach the exterior keypad or cylinder. If your door has a 2-1/8 inch hole and the lock needs an adapter, fit it first.

5. Mount the interior part

Pass the cable through the interior mounting plate, secure the plate, and connect the cable. Tuck any extra cable flat so it does not get pinched, then attach the interior housing.

6. Insert batteries and test

With the door open, insert the batteries. Many locks run a short self-test where the bolt extends and retracts to learn the door's orientation. A status light usually shows whether it succeeded.

7. Pair with the app

Follow the manufacturer's app instructions. Add the lock to your hub or smart home app if you use one, and set up user codes.

Test it before you rely on it

  • Lock and unlock several times with the door open, then closed.
  • Check that the bolt fully extends into the strike plate.
  • Try each access method: app, keypad, key and voice assistant, if used.
  • Confirm you still have a physical key somewhere safe.

Common mistakes

  • Installing the latch with the slant facing the wrong way.
  • Pinching the cable between the door and the lock.
  • Misaligning the strike plate, so the bolt does not reach.
  • Inserting batteries while the door is closed, which can lock you out if setup fails.
  • Leaving the default access code active.

Keep it secure

  • Use a strong, unique password for the lock's account, and turn on two-factor authentication if it is offered.
  • Set unique codes for family members, and delete codes for guests when they leave.
  • Update the lock's firmware when updates are available.
  • Replace batteries when the low-battery warning appears.

See our guide to keyless entry systems for more on how these locks work, and the home security setup guide for a wider checklist.

Recommended gear

These are the types of product that fit this guide. The links open Amazon search results so you can compare current options. Prices and availability can change.

Frequently asked questions

Can I install a smart lock myself?

Yes. Most models replace an existing deadbolt and need only a screwdriver. If your door has no pre-drilled holes, consider hiring a locksmith.

How long does installation take?

Typically 30 to 60 minutes for a first-time installer.

Will a smart lock fit any door?

It fits most standard doors. Check the door thickness, backset and hole sizes against the lock's specs.

What happens if the batteries die?

Most locks warn you well in advance. Many also have a backup power option, such as a 9V battery contact, or a physical key.

Do smart locks work without Wi-Fi?

Many do. Bluetooth, keypad and key access work without Wi-Fi. Remote control and alerts usually need Wi-Fi or a hub.

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