How to install sash window locks

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How to install sash window locks

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Project Overview

Installing a lock on a double hung sash window is easy and a great way to protect your home. You can open the window from the inside but would-be intruders can’t open it from the outside. We’ll show you how to centre and fit the lock in just a couple of steps. We have used a swivel lock for this demonstration, but you can also use a key lock.
Continue to step-by-step instructions
This D.I.Y. Advice is part of a series How to install a sash window

Step by Step Instructions

1 Position the lock on the sash window
2 Drill in pilot holes for the screws in sash window frame
3 Screw the sash window lock in place
  • Step 1. Position the lock on the sash window

    Before you start, close the window. Take your ruler and measure the width of your window. Mark the centre of the window frame with your pencil where the upper and lower windows meet. Centre the lock/fastener over the mark. The lock comes in two parts, so place the back piece on the top sash and the front piece on the bottom sash.
  • Step 2. Drill in pilot holes for the screws in sash window frame

    Take your pencil and mark out the screw points through the holes of the lock. Next, take away the lock and drill some pilot holes into those marks, using your power drill. Make sure that you choose a drill bit that is the size same size as your screws.
  • Step 3. Screw the sash window lock in place

    Place the fastener back over the holes and screw it into position. To protect the glass, use a screwdriver for the back piece of the fastener. And finally, use your drill with the screw bit for the front piece. When you’re done, open and close the window to make sure the fastener is working properly.

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