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How to install a door lock

A partially opened white door with a modern black handle and latch.

Overview

Installing a door lock is a straightforward D.I.Y. project that can add privacy and security to areas in your home. Whether it’s for a bedroom, bathroom, or entry door, this step-by-step guide will walk you through the process of fitting a door handle with a lock. 

Safety tip: Always wear the appropriate safety equipment (safety glasses, gloves, ear muffs and a mask, for example) and always follow the instructions for the product or equipment. 

Steps

1Mark the height for the new handle

Since this is a new door, start by marking the height for the new handle. A handy tip is to measure the height of other door handles in your home and match it for consistency. If you’re not sure, 1050 mm from the floor is a good standard height.
Mark the measurement on a wall using measuring tape

2Mark the backset distance

The backset is the distance from the door edge to the centre of the handle hole. This is typically 60 mm or 70 mm, but it’s best to refer to the product instructions for accuracy. Use a square to carefully mark this measurement on both sides of the door.
Marks a straight line on wood with a combination square and pencil.

3Drill the hole for the handle

Attach a hole saw to your drill and line it up with the backset mark. Drill halfway through the door from one side, then switch to the other side to complete the hole. This will prevent the timber from splintering.
Drill a hole in the wall using a drill with a hole saw attachment

4Drill the hole for the latch

door edge. Use a spade drill bit that matches the width of the latch and drill to the required depth so the latch fits snugly.
Drill a hole in the door edge

5Install the latch mechanism

Insert the latch mechanism into the hole, making sure the curved side of the latch faces the door jamb. Use a pencil to mark the screw holes, then remove the latch and pre-drill the holes. Place the latch back into the door and secure it with screws. 
Install the latch mechanism on a green door with a drill

6Create the recess

Next, trace around the outside of the latch face with a pencil or utility knife, then chisel out the marked area so the latch sits flush with the door. Be careful not to chisel too deep. Insert the latch back into the door and secure it with screws.
Create a recess in a wooden door

7Fit the door handle

Align the outside handle with the spindle and insert it through the hole. Attach the inside handle, ensuring everything is lined up correctly. Tighten the screws to secure the handle into place. Test the handle and the key to make sure they operate smoothly.
Fit the door handle on a wooden door

8Fit the striker plate

Close the door and mark the latch height onto the door jamb. Then, measure the width from the inside of the door to the edge of the flat side of the latch. Transfer this measurement onto the door jamb by measuring outward from the door stop.
Mark the latch height on the door jamb

9Secure the striker plate

Align the striker plate with your marks, pre-drill the holes, and secure it with screws. Trace around the striker plate, remove it, and use a spade bit to drill out the hole. Chisel out the rest so the striker plate sits flush with the jamb.

Finally, test the door handle with lock to ensure everything is working properly. Check that the door opens, closes, and locks smoothly. If you’re planning to paint the door, a good tip is to remove the handle first to avoid getting paint on it. 

10Now that you’ve installed a lock...

Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.