In a word, yes! 

Installing your own windows may seem like an intimidating DIY task, but it’s not nearly as complicated as often assumed. And uPVC windows are considerably easier to install than other varieties.

With the amount of money you could save on what can be a costly home improvement, learning how to install uPVC windows is certainly a skill worth acquiring – and with this handy guide, you’ll be ready to get started in no time. 

Why install your own uPVC windows?

Whether you’re replacing a broken window or upgrading your property to improve its energy efficiency, knowing how to install new uPVC windows can bring a couple of key benefits.

Firstly, you can save on the cost of installation — no need to pay for labour. Secondly, you can work to your own schedule and sort out your replacement windows at whatever pace works for you. But where to start?

Purchase the right size uPVC frames

Before you can start preparing your space, it’s important to choose the right uPVC window frames. First, measure your wall opening — you’ll then need to buy a window 10 millimetres narrower than the width of the space where it will go. This is because once it’s installed, there needs to be a 5-millimetre gap between the wall and the frame on either side, giving the window room to expand and contract. The height, however, should be exactly the same.

It can be helpful to look for a window supplier that offers a custom sizing service — that way, you can ensure your new uPVC windows will be the perfect fit.

How to install your uPVC windows

Now let’s take a look at the steps you’ll need to follow to install your uPVC windows.

Please note that this guide assumes you have an empty opening ready, and doesn’t explain how to remove an existing window. While this is also relatively straightforward, you’ll need some further instructions if you’re not yet at this stage.

Fit the sill endcaps 

Superglue the outer edges of the sill endcaps and then insert them into the corner openings. It’s important to fix these properly — if water enters and freezes after installation, it could break open the frame. If in doubt, a guide should have come with your windows.

Screw the sill into the frame

Place the PVC screws that came with the window into the pre-made holes in the sill, and line the sill up with the window frame. Use an electric screwdriver to tighten the screws. The sill should then be fully attached to the frame.

Seal the window sill

Fill the gaps around the frame with silicone caulk, so any openings are fully sealed.

Place the frame in the opening

It’s helpful to have someone to assist you with this stage. One of you will need to hoist the frame into the opening while the other sets a level around the sides. If you struggle to get the frame into the opening, use a flat pry bar to slide it in.

Measure and drill fixing holes

On the sides, mark points 15cm up from the bottom of the frame and down from the top. Then mark 60cm in from the right and left on the top and bottom. Drill pilot holes on these spots.

Seal and drill the fixing screws 

Add a small amount of silicone gel to the holes at the bottom of the frame. Then put the fixing screws that came with the window into the 8 holes you made, attaching it to the wall.

Insert the glazing platforms and glass panels

These go in before the glass on the same panels and should snap into place at the top and bottom. 

Next, match the pane of glass with the right frame opening. Seat it at the bottom of the frame first, then push it snuggly into place at the top with a glazing shovel. 

Hammer in the glazing beads

Put each bead where the frame and edge of the sash meet at the corners and gently hammer them in.

Fill the gap between the frame and the wall

This should only be a tiny gap, but it’s vital to close it entirely. Run the silicone around the full edge of the interior window frame, then do the same with the external surface. Again, any gaps could cause serious damage, so don’t cut corners with this.

Admire your handiwork

Just like that, the job’s done! All you’ll need to do is repeat it for however many other windows you’ve challenged yourself to. Keep your eyes on the prize, and know how rewarding it’ll be when you finish the full project.

uPVC windows from Flying Doors

Remember, the best way to give your home the refresh it deserves is by selecting premium uPVC windows from a reputable supplier. That way, you can get top-quality results while saving on installation costs.