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A guide to window frames for your home

4 min read
Oct '25 • by Heather

Quick summary

Window frames in the UK vary in cost from about £5,000 to £25,000 depending on material and size, with uPVC being the cheapest and composite the most expensive. The price also depends on the type of opening mechanism and the size of your windows, but repair might be an option for wooden frames if they aren’t rotten.

If you’re in the process of an extension or perhaps a renovation, you might be considering what to do with your windows.

While many mull over the size of the windows and what glass to fit, you can’t forget that most important element - your window frames.

In this guide, we’ll cover everything you could ever want to know on frames. From materials, ventilation, all the way how they open. Let’s dive on in...

Choosing the right material

Picking a material is one of the biggest decisions you’ll make when it comes to your frames. There are plenty of options available, so here are some things to consider.

uPVC (Plastic)

Cost: £5,000 - £15,000

Plastic frames have been a popular home option for years and it’s easy to see why. UPVC is a very cost effective option, probably the cheapest out of all of them, depending on the quality you opt for. What’s more, they’re incredibly durable, requiring little to no maintenance from the homeowner.

However, be careful about how cheap you go with these frames. Super cheap uPVC tends to look very unappealing, and if it ends up breaking it’s difficult to make repairs.

Metal

Cost: £8,000 - £20,000

The most common metals found on frames are steel and aluminium. You also get something known as GRP, which is technically fibreglass, but has many of the similar properties as the other metals listed above.

Metal has been gaining in popularity in recent years, as it helps create a stylish modern look to the property. Most people agree they’re a more visually appealing option, next to uPVC. They also have many practical benefits too. It’s a very strong, load bearing material, and can be crafted into thin frames. What’s more, they’re incredibly low maintenance.

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