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Installing a Security Lock

Project Overview

Installing a Security Lock

Deadbolt locks provide extra security for entry doors. There are two types -- single-cylinder and double-cylinder. Single-cylinder types feature a finger latch that can be opened from the inside. Double-cylinder deadbolts must be opened with a key from either side of the door. Both types are available in a variety of styles and finishes to match existing hardware.

9 Steps

  1. Measure to Find Lock Location
  2. Bore a Cylinder Hole
  3. Bore the Latch Bolt Hole
  4. Insert the Latch Bolt
  5. Mark Outline of the Mortise
  1. Cut the Outline of the Mortise
  2. Make Cuts Across the Mortise
  3. Pry out Waste Chips
  4. Bore Bolt Hole & Install Strike Plate
Show all steps »
Measure to Find Lock Location

Step 1

Measure to Find Lock Location

Measure to find the lock location. Tape the cardboard template supplied with the lockset onto the door. Use a nail or awl to mark the centrepoints of the cylinder and the latch bolt on the door.

Bore a Cylinder Hole

Step 2

Bore a Cylinder Hole

Bore a cylinder hole with a hole saw and drill. To avoid splintering the door, drill through one side until the hole-saw pilot (mandrel) just starts to come out the other side. Remove the hole saw and then complete the hole from the opposite side of the door.

Bore the Latch Bolt Hole

Step 3

Bore the Latch Bolt Hole

Use a spade bit and drill to bore the latch bolt hole from the edge of the door into the cylinder hole. Make sure to keep the drill perpendicular to the door edge while drilling.

Insert the Latch Bolt

Step 4

Insert the Latch Bolt

Insert the latch bolt into the edge hole. Insert the lock tailpiece and connecting screws through the latch-bolt mechanism, and screw the cylinders together. Mark the edge of the latch with chalk and close the door. The chalk will mark the door jamb, indicating where to properly place the strike plate.

Mark Outline of the Mortise

Step 5

Mark Outline of the Mortise

Mark the outline of the mortise with a pencil. Use the hardware as a marking template when drawing the outline for strike plate mortises and hinge mortises.

Cut the Outline of the Mortise

Step 6

Cut the Outline of the Mortise

Cut the outline of the mortise by holding a chisel with the bevel-side in and tap the butt end lightly with a mallet or hammer until the cut is at the proper depth.

Make Cuts Across the Mortise

Step 7

Make Cuts Across the Mortise

Make a series of parallel depth cuts 1/4 inch apart across the mortise with the chisel held at a 45-degree angle. Drive the chisel with light mallet blows to the butt end of the chisel.

Pry out Waste Chips

Step 8

Pry out Waste Chips

Pry out the waste chips by holding the chisel at a low angle with the bevel-side toward the work surface. Drive the chisel by light hand pressure.

Bore Bolt Hole & Install Strike Plate

Step 9

Bore Bolt Hole & Install Strike Plate

Bore the latch bolt hole in the centre of the mortise with a spade bit. Install the strike plate using the retaining screws provided with the lockset.

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Project Details

Skill Level: Beginner

Time: 1 hour

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.


  • Installation Template (furnished with lock)
  • Deadbolt

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