When it comes to properties in the UK, there’s a variety of styles in every town and city. This means that the windows can vary also, and there’s no set size. Their dimensions depend on their window design, and the age and size of the house.
However, there are common window sizes which we will talk you through. This will help you get an idea of what price you will pay when getting quotes.
While an idea of size is useful at this initial stage, professional installers will be able to take exact measurements to make sure the windows fit perfectly.
UPVC Windows
UPVC windows are often chosen for their low maintenance qualities and reasonable price. Here are a few average sizes:
- Heights: 600mm, 1050mm, 1200mm, 1350mm, 1500mm
- Widths: 488mm, 630mm, 915mm, 1200mm, 1770mm

Casement Windows
Widely used throughout the UK thanks to its versatility. Typical dimensions are:
- 635 x 890mm
- 736 x 1194mm
- 736 x 1498mm

Tilt and Turn Windows
Offering both versatility and straightforward maintenance, tilt and turn windows typically come in the following sizes:
- 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 Guidance
Bathroom – These windows are usually relatively small as privacy is important, with frosted glass often used.
Living Room – Probably the largest windows in the house are in the living room, so there’s the benefit of lots of light.
Kitchen – In kitchens, windows tend to sit higher and are usually shorter, perfect for above the sink.
Bedroom – There’s no one-size-fits-all for bedroom windows. They can be wide and light-filled or small and cosy, depending on the look you’re after.

Materials & Their Impact on Size
The material you choose for your window and their characteristics will likely influence the size. Common window materials and things to consider about their size are:
UPVC: They tend to follow standardised sizes, making it a cost-effective and straightforward (and fast) option for professionals to install.
Timber: Commonly bespoke, particularly suited to traditional homes or listed buildings where character and detail are key.
Aluminium: Known for its slim sightlines and ability to support large panes of glass, perfect for contemporary designs and maximising natural light.

Understanding standard window sizes is a helpful starting point, but no two homes are exactly the same. That’s why, at Amber Home Improvements, we take precise on-site measurements to ensure your new windows not only fit perfectly but also complement the unique character of your home.
Considering replacing your windows? Our expert team is here to support you. Get in touch for a quote today.
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.
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