No two homes in the UK are the same, and the same goes for their windows. From period properties to contemporary builds, window dimensions can differ significantly depending on the design, location and age of the house.
Even though there’s no universal window size, knowing the most common measurements can help you get a better idea of what to expect when planning your replacement windows, especially when it comes to pricing.
It’s worth keeping in mind that professional installers will always take exact measurements on-site to ensure a perfect, draught-free fit.
UPVC Windows
Favoured for their durability, affordability, and minimal upkeep. These are some of the most common sizes:
- Heights: 600mm, 1050mm, 1200mm, 1350mm, 1500mm
- Widths: 488mm, 630mm, 915mm, 1200mm, 1770mm

Casement Windows
A timeless and practical option that suits all kinds of homes. Average sizes include:
- 635 x 890mm
- 736 x 1194mm
- 736 x 1498mm

Tilt & Turn Windows
Great for modern homes, combining ventilation and easy cleaning. These are the usual size ranges:
- Single: 600 x 500mm (min), 1900 x 1300mm (max)
- Double: 600 x 1200mm (min), 1700 x 2400mm (max)
- Triple: 600 x 1600mm (min), 1900 x 3000mm (max)

Room-by-Room Window Tips
Bathroom – Typically compact with privacy in mind, often using obscure or frosted glass.
Living Room – Expect larger windows here to flood the space with daylight.
Kitchen – Windows are usually placed higher up, often above the sink and slightly shorter.
Bedroom – Sizes and styles vary depending on the feel you want – from bright and open to more intimate.

How Materials Can Influence Window Size
The material you choose isn’t just about looks – it also impacts sizing options and flexibility.
UPVC: Comes in standard sizes, offering an easy and budget-friendly solution.
Timber: Frequently bespoke, ideal for homes where tradition and detail are key.
Aluminium: Known for strength and sleek frames, perfect for maximising glazing and creating contemporary looks.

While standard sizing gives you a helpful baseline, it’s only part of the picture. At Mid Wales, we provide bespoke solutions and take care of all the measuring, so your windows fit like a glove and suit your home beautifully.
Ready to take the next step? Speak to our friendly team today for expert advice and a tailored quote.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
REQUEST YOUR FREE QUOTE
Simply fill in your details for your free, no obligation quotation, and click "Get Quote"