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How to Install a Double Glazed Window

Posted by Barry on
How to Install a Double Glazed Window

How to Install a Double Glazed Window

Are you thinking of installing a double glazed window yourself? You don’t want the workmen to make a mess in your home? You can save some money by fitting the window yourself. It is not a challenging task but there are certain factors the professionals know, which make it easier to install your double glazed window safely.

Follow the steps to fit a double glazed window:

Things you will need:

  • Drill
  • Chisel
  • Screwdriver
  • Spirit Level
  • Frame Fixings
  • Silicone Sealant
  • Gloves

Make Sure the Frame is Clean

You should remove all the traces of the silicone, you can use a chisel to remove the silicone along the edges.

Check and Clean the Window Unit

Usually, there will be some amounts of sealant on the window. It can be removed using a razor blade in a window scraper. There may be chunks of adhesive on the edge of the unit. It can be removed using a chisel.

Check the Window Fits

Put on gloves to prevent the chance of cutting yourself. Place the new window into the frame at the top, placing it on the edge of window sill. You need to place 4 rubber setting pads, then use a suction cup to lift the unit and place it in the frame. In case, it does not fit you might need a chisel to enlarge the window frame.


It is difficult to handle window unit by yourself, it is advised that 2 people can ease it in. Use the sealing tape on all the sides of the frame. It is recommended to not stretch the tape, you should hold the tape in position with one hand and use your finger to line it with the frame. When you are finished with all the sides, remove the white tape.

Add the Setting Blocks

You need to add 4 setting blocks on the sill. They will make sure the base does not sit in moisture and that each sheet of glass is supported. Usually, the window frame is sloped to allow water to run off.

Insert the Window

Place a bead of silicon along the base for the glass to sit on. Insert the window and add a stop so that it does not fall out.

Add External Beading

Hammer small nails into the wood, ensure that they come out on the side of the wood. Push firmly on the glass when hammering in the nails and be careful not to hit the glass. It is recommended that to wrap a piece of rubber around the hammer. It will minimize the risk and use as a nail punch.

Paint the Frame

Now you just have to paint the frame, you can also paint the frame before attaching if you are a good painter. Then you will just have to do a touch-up.

An important tip is to always wear gloves to ensure the safety of your hands. Try these steps and let us know in the comments below.

For a more advanced guide of how to install double glazing click the link to a company i highly recommend called complete glazing.