How to install a deadlock

James, Team member
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How to install a deadlock

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Project Overview

When it comes to home security, your front door is the front line. That’s why it’s important to have a deadlock on it, to give you peace of mind that your home is secure. Continue to step-by-step instructions
predetermined drill depth
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How to drill to a certain depth

If you want to match the length of a fixing or avoid drilling through to the other side, here’s an easy way to get the hole depth right every time. Take your fixing and line it up with your drill bit. Wrap masking tape around the bit to mark the length of the fixing. Then drill until your masking tape marker is flush with the surface.

Step by Step Instructions

1 Handy hints
2 Measure and mark for the deadlock
3 Use the template
4 Drill a hole in the door
5 Cut the cylinder bar to length
6 Attach the mounting plate
7 Insert the second retaining screw
8 Checkout for the striker plate
9 Hammer and chisel the checkout
10 Attach the door frame strengthener
11 Attach the striker plate
12 Test the lock
  • Step 1. Handy hints

    Before you buy a deadlock work out whether you have a left- or right-handed door. To do this step outside and look at the door, if the hinges are on the left, it’s a left-handed door and vice versa. Also, check the backset, the distance between the outside of the door and the centre of the doorknob, that is, how far the handle is set back from the door edge. The most common backset measures in Australia are either 60mm or 70mm. But check your door just to be sure. And don’t forget to read the instructions before you start.
  • Step 2. Measure and mark for the deadlock

    Work out what height you want the deadlock to be on your door, making sure it won’t interfere with the door handle. Once you have marked the height on the door jamb, transfer it to the door. Square off the marks on the door, so you know where to put your template.
  • Step 3. Use the template

    Place the template on the door and use a combination square to ensure the template is square with the door. Most latches come with double-sided templates. Use whichever is relevant to the side you are putting your latch on. Drill four holes for the latch mounting. Mark the drill bit to ensure the hole is not too deep. Be sure to keep the drill level. Then drill a hole all the way through the door in the centre of the template. Now remove the template.
  • Step 4. Drill a hole in the door

    Use a spade bit or a hole saw to drill a hole in the door. To achieve a neat cut, drill through one side of the door. When the bit comes through to the opposite side of the door, finish the cut from the other side of the door.
  • Step 5. Cut the cylinder bar to length

    Put the cylinder bar through the cylinder ring and put the unit through the hole. Use the template to measure and mark where to make the cut on the cylinder bar. Cut the bar using pliers.
  • Step 6. Attach the mounting plate

    Use a screwdriver to remove the mounting plate from the lock. Screw the mounting plate onto the door. Align the notch on the hub with the “V” on the mounting plate. Assemble the cylinder assembly in the door, making sure the connecting bar engages in the slot. Now attach the rear retaining screw to secure the cylinder assembly to the door, making sure the lock hole is straight.
  • Step 7. Insert the second retaining screw

    Insert the key into the lock, rotate the hub enough to expose the hole for the second retaining screw. Insert the screw and tighten it. Now refit the latch to the mounting plate.
  • Step 8. Checkout for the striker plate

    Place the striker plate on the door lock and close the door. Mark out where to put the checkout on the jamb. Transfer the marks around the door jamb. Once on the frame, trace around the striker plate for the checkout and mark for the depth as well.
  • Step 9. Hammer and chisel the checkout

    Use a hammer and chisel to remove the wood for the checkout. Don’t forget to wear your safety gear.
  • Step 10. Attach the door frame strengthener

    Place the template for the door frame strengthener on the door frame, where the striker plate will go. Drill the two holes then attach the door frame strengthener with the extra-long screws.
  • Step 11. Attach the striker plate

    Place the striker plate over the door frame strengthener, pre-drill and screw it into place.
  • Step 12. Test the lock

    Test the lock works by going outside and making sure you can unlock it with your key.

Tools and Materials


  • Chisel
  • Combination square
  • Ear muffs
  • Hammer
  • Impact driver
  • Mallet
  • Measuring tape
  • Pencil
  • Power drill
  • Ruler
  • Safety goggles
  • Screw driver
  • Spade bit
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