Clear Guide to Standard Window Sizes in the UK
Standard window sizes vary from house to house as properties in the UK are so mixed, differing in size and shape. A property’s style and age will often dictate window dimensions.
A professional window installer will be able to ascertain what sizes are required for window openings to ensure a seamless fit with the absence of any gaps.
To guide you through it, Eden is going to outline the size charts for several types of windows. But we’ll start by delving into this question: What are standard window sizes?
Standard UPVC Window Sizes
UPVC windows are present in a significant number of UK homes, recognised for their impressive durability and very reasonable pricing.
The average height and width of standard double glazed window sizes are split into the following two lists:
Average UPVC window height:
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59 inches / 1500 millimetres
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53.1 inches / 1350 millimetres
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47.2 inches / 1200 millimetres
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41.3 inches / 1050 millimetres
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23.6 inches / 600 millimetres
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17.7 inches / 450 millimetres
Average UPVC window width:
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69.7 inches / 1770 millimetres
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47.2 inches / 1200 millimetres
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36 inches / 915 millimetres
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24.8 inches / 630 millimetres
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19.2 inches / 488 millimetres
Standard Casement Window Sizes
The casement window has certainly earned its classic status if only for its supreme versatility. It enjoys incredible popularity in this country and can be configured into countless arrangements to suit openings.
These are common casement window sizes:
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635 mm × 890 mm (25 × 36 in)
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736 mm × 1194 mm (29 × 74 in)
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736 mm × 1498 mm (29 × 59 in)
Standard Tilt and Turn Window Sizes
Tilt and turn windows are very distinct from other window styles – they have an opening facility that lets you access the outer pane from inside the house for cleaning and enjoy controlled ventilation.
Here are the typical sizes of single, double and triple glazed tilt and turn windows:
Single Tilt and Turn:
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Min: 600 mm × 500 mm (23.6 × 19.7 in)
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Max: 1900 mm × 1300 mm (74.8 × 51.2 in)
Double Tilt and Turn:
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Min: 600 mm × 1200 mm (23.6 × 47.2 in)
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Max: 1700 mm × 2400 mm (66.9 × 94.5 in)
Triple Tilt and Turn:
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Min: 600 mm × 1600 mm (23.6 × 62.3 in)
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Max: 1900 mm × 3000 mm (74.8 × 118.1 in)
Standard Sash Window Sizes
Sash windows have the look of a traditional timber window from decades past, which sees them often selected as a window replacement for older cottages and country retreats. Owners of contemporary dwellings also regularly opt for sash windows to inject them with vintage character.
The standard widths of sash windows are:
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914 mm (36 in)
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1219 mm (48 in)
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1524 mm (60 in)
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1829 mm (72 in)
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2134 mm (84 in)
The standard heights of sash windows are:
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609 mm (24 in)
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914 mm (36 in)
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1219 mm (48 in)
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1524 mm (60 in)
Standard Bay Window Sizes
A bay window is always a centrepiece of a home frontage as it extends out from a property, and with it, attracts a profuse amount of natural sunlight to leave a room bursting with radiance. Sun-lit spaces feel bigger than they are and you can fashion a window seat in a bay.
Below is the standard window sizes in cm for bay windows:
Bay Window Standard Width:
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Min: 1016 mm (3 ft 6 in)
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Max: 3200 mm (10 ft 6 in)
Bay Window Standard Height:
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Min: 914 mm (3 ft)
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Max: 1981 mm (6 ft 6 in)
Window Sizes
Room-by-Room
Bathroom
Bathroom windows tend to be on the smaller side, retaining the privacy of users while letting in light.
Living Room
You generally find the largest windows in living rooms to maximise light capture and convert them into beautifully open and inviting locations.
Kitchen
Kitchen windows usually get installed higher, such as above a sink, and have a shorter height. If you have an open-plan kitchen-diner, attracting abundant light is vital.
Bedroom
A home’s layout and style will govern bedroom window sizes. Employ a large feature window in your bedroom to wake up to a bright space or keep openings to minimum if you want a more restful resting chamber.
Standard Sizes By Window Material
The chosen window material will be a factor in standard window sizes and also determine the level of design flexibility.
UPVC – Replacement windows crafted from UPVC mostly conform to standard sizes, a reasoning for their popularity, as is the affordability of UPVC frames. Standard UPVC window sizes and the dimensions of them generally align with window openings, ensuring seamless installation.
Timber – Occupants of period homes and in conservation areas will often look to bespoke-made timber windows as replacements. When tailored design is involved, standard sizing may not be applicable.
Aluminium – Despite being one of earth’s most robust materials, aluminium is extremely malleable, which is how ultra-slim aluminium windows can be fashioned. For particularly wide or tall windows, prioritise aluminium openings.
How To Correctly Measure Windows
If replacing your windows is something you’re thinking about at the moment, it’s useful for you to know how to measure up for your windows and get the right sizes. Adhere to our step-by-step instructions.
Measure from the outside
Head outside of the house with your tape measure as that’s how you will get more precise measurements than you would if you did it from inside.
Take three measurements
Glean the width of the window by measuring across in three separate places – the top, middle and bottom. Do similar to get the height – from the left side, centre and right side. You’re then unlikely to miss any irregularities in the wall or framework.
Check for squareness
You need window openings to be square. Figuring that out requires you to measure diagonally from corner to corner in both directions. Near-matching measurements indicate that an opening is square. If they’re very different, you’re advised to bring it up with your installer.
Allow for fitting tolerance
You must account for some fitting tolerance when you are measuring up for the best coloured UPVC windows. Take 5-10mm off the width and height measurements so that there’s space for an installer to adjust and fit the replacement frames.
Summary: Standard UK Window Sizes Summarised
Knowledge of the average window size in the UK is helpful if you’ve got one window crying out to be replaced or a group of openings that need updating.
Employ Eden Windows and we’ll see to all the measuring up for window replacements and also help you uncover a window style that matches your property’s aesthetic.
Don’t be shy to speak to us if anything in this piece needs clarifying further. You can read other informative pieces that we’ve drafted, including one on what is u value in windows.
Looking for new replacement windows?
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