How to Install a Deadbolt Lock
Add a new deadbolt to a door for improved security
What You'll Need
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Tools
Drill
Hole saw kit
2-1/8 inch for face, 1 inch for edge
Chisel
Hammer
Screwdriver
Tape measure
Pencil
Materials
Step-by-Step Instructions
Mark hole locations
5 minutes
Use the template included with your deadbolt. Standard height is 6-12 inches above the existing door knob. Mark the center of the 2-1/8 inch face hole and the 1-inch edge hole.
Pro Tip
Most deadbolts include a paper template that folds over the door edge for accurate marking.
Drill the face hole
10 minutes
Using the 2-1/8 inch hole saw, drill from the INSIDE of the door until the pilot bit just pokes through. Then complete the hole from the OUTSIDE. This prevents splintering.
Warning
Drilling from one side only will cause the wood to splinter on the exit side.
Drill the edge hole
5 minutes
Use the 1-inch hole saw or spade bit to drill through the door edge into the face hole. Keep the drill level and perpendicular to the edge. This is for the bolt mechanism.
Chisel the mortise for latch plate
10-15 minutes
Insert the bolt mechanism and trace around the latch plate with a pencil. Remove the bolt and chisel out a shallow mortise so the plate sits flush with the door edge.
Pro Tip
Score the outline with a utility knife first for cleaner edges.
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Track This Project FreeInstall the bolt mechanism
3 minutes
Insert the bolt through the edge hole, position the latch plate in the mortise, and secure with the provided screws.
Install exterior and interior cylinders
5 minutes
Insert the exterior cylinder through the face hole, making sure the tailpiece engages the bolt mechanism. Attach the interior thumb turn and secure with the connecting screws.
Mark and install strike plate
15 minutes
Close the door and mark where the bolt hits the frame. Drill a 1-inch hole, 1 inch deep into the frame for the bolt. Chisel a mortise for the strike plate. Install with the provided screws PLUS at least one 3-inch screw that reaches the wall framing.
Warning
Using short screws in the strike plate is a major security weakness - the door can be kicked in easily.
Test operation
3 minutes
Test the deadbolt from both sides. It should extend and retract smoothly. Test with the key from outside. The door should close and the bolt should engage the strike without forcing.
Common Mistakes to Avoid
- Drilling from one side only (causes splintering)
- Misaligned strike plate (bolt doesn't engage properly)
- Using short screws in strike plate (security risk)
- Not using the template (holes in wrong position)
Safety Warnings
- Wear safety glasses when drilling and chiseling
- Secure the door to prevent movement while drilling
- Be careful with the chisel - always cut away from your body
When to Call a Professional
For smart locks with complex wiring, if you're uncomfortable with the drilling, for metal doors, or if the door is fire-rated (requires special hardware).
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Frequently Asked Questions
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Project Overview
- Difficulty
- Intermediate
- Time
- 30-60 minutes
- Est. Cost
- $25–$100
- Tools
- 7 items
- Materials
- 2 items
- Steps
- 8
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