What is a standard external front door size?
If you’re replacing an external door in the UK, there isn’t fixed standard door sizes, it’s more like a handful of popular dimensions used across the industry. In England and Wales, the go-to width for external replacement doors tends to be 762 mm, while Scottish homes often feature slightly narrower styles, around 726 mm wide.
It’s worth knowing that every installer and manufacturer might have a slightly different take on what counts as standard sizes depending on the age of the property and what products they supply.
At Bon Accord Glass, every door is made to measure, so whether your home needs something classic or a little more custom, we’ll make sure the fit is spot on.
Why Understanding UK Standard Door Sizes Makes a Difference
Even if you’re not choosing an off-the-shelf product, it helps to understand the most common UK standard door sizes before you dive into a home improvement project.
It’ll give you a head start when chatting through designs and can help ensure accessibility and building regulations are properly factored in, especially when planning wide openings or entrance upgrades.
And if you’re working with a builder or architect, knowing your 762s from your 838s (or your mm from your inches!) means you’ll be speaking the same language from day one.
Metric or Imperial? Standard Door Sizes Conversions Explained
Across the UK, internal and external doors are still described using both imperial and metric systems, depending on the age of the building or who you’re talking to. So a 2’6” wide door? That’s 762 mm.
Generally, imperial sizes like 2’3” and 2’9” are common in older English and Welsh homes, while modern builds, particularly right here in Scotland, lean towards metric sizes like 2040 mm high. Here’s a quick reference:
Imperial Size
Metric Equivalent(mm)
Common Width(mm)
Common Height(mm)
Imperial Size
2'3" x 6'6"
Metric Equivalent (mm)
686 x 1981
Common Width (mm)
686
Common Height (mm)
1981
Imperial Size
2'4" x 6'6"
Metric Equivalent (mm)
711 x 1981
Common Width (mm)
711
Common Height (mm)
1981
Imperial Size
2'5" x 6'6"
Metric Equivalent (mm)
762 x 1981
Common Width (mm)
762
Common Height (mm)
1981
Imperial Size
2'6" x 6'6"
Metric Equivalent (mm)
838 x 1981
Common Width (mm)
838
Common Height (mm)
1981
Imperial Size
-
Metric Equivalent (mm)
726 x 2040
Common Width (mm)
726
Common Height (mm)
2040(Common in Scotland)
Imperial Size
-
Metric Equivalent (mm)
826 x 2040
Common Width (mm)
826
Common Height (mm)
2040
UK Internal Door Sizes at a Glance
One of the most popular standard interior door sizes in the UK is 762 mm × 1981 mm, commonly known as 2’6” × 6’6”. It’s a practical option, wide enough for comfortable everyday access without taking up too much wall space.
New-build homes, particularly in Scotland, tend to favour a taller 2040 mm height for a more modern, spacious feel. These types of doors are often found in widths of 726 mm, 826 mm or even 926 mm for greater accessibility.
For a side by side comparison of standard internal door sizes, read this table:
Imperial Size
Metric Equivalent(mm)
Region Commonly Found
Notes
Imperial Size
2'0" x 6'6"
Metric Equivalent (mm)
1981 x 610
Region Commonly Found
England & Wales
Notes
Slimmer door, often for cupboards
Imperial Size
2'3" x 6'6"
Metric Equivalent (mm)
1981 x 686
Region Commonly Found
England & Wales
Notes
Common in older homes
Imperial Size
2'6" x 6'6"
Metric Equivalent (mm)
1981 x 762
Region Commonly Found
England & Wales
Notes
Standard internal door size
Imperial Size
2'9" x 6'6"
Metric Equivalent (mm)
1981 x 838
Region Commonly Found
England & Wales
Notes
For wider access needs
Imperial Size
-
Metric Equivalent (mm)
1981 x 864
Region Commonly Found
England & Wales(Less Common)
Notes
Occasionally used for accessibility
Imperial Size
-
Metric Equivalent (mm)
1981 x 913
Region Commonly Found
England & Wales(Rare)
Notes
Very wide internal door
Imperial Size
-
Metric Equivalent (mm)
2040 x 726
Region Commonly Found
Scotland(New Builds)
Notes
Standard Scottish spec
Imperial Size
-
Metric Equivalent (mm)
2040 x 826
Region Commonly Found
Scotland / modern builds
Notes
More spacious feel
Imperial Size
-
Metric Equivalent (mm)
2040 x 926
Region Commonly Found
Scotland / accessible homes
Notes
Often used for wheelchair access
External Door Sizes & Popular Materials
For front and back doors, 1981 mm is the most typical height, with standard door width UK ranging from 762 mm to 915 mm.
Our advisors frequently get asked how tall are doors in UK homes but it is difficult to answer because doors are getting taller and wider. Larger measurements like 2010 mm × 900 mm are increasingly popular in modern designs, offering better proportions and a grander feel.
It’s also worth thinking about material thickness. Composite doors usually fall between 44 mm and 70 mm thick, while UPVC tends to be on the slimmer side.
Not just a design choice, thickness affects insulation, durability, and even your choice of locks and handles. Thicker doors also tend to be the best front doors for security UK wide.
Height(mm)
Width(mm)
Common Materials
Typical Thickness
Height (mm)
1981
Width (mm)
762 - 915
Common Materials
Timber, Composite, uPVC
Typical Thickness
44 - 70mm
Height (mm)
2040
Width (mm)
826 - 926
Common Materials
Timber, Composite
Typical Thickness
44 - 70mm
Height (mm)
2083
Width (mm)
864 - 915
Common Materials
Timber, Composite
Typical Thickness
44 - 70mm
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Standard Door Sizes and Their Styles
Different doors call for different measurements. Whether you’re installing French doors, sliding doors, or even a garage door, knowing what the standard door sizes range from can help you plan ahead.
Pair / Double Doors
Double doors typically range from 915 mm up to 1512 mm in width, with a standard height of 1981 mm. Ideal for creating a wider, more open feel inside or out.
French Doors
French doors usually start at around 914 mm (36 in) wide and go up to 1524 mm (60 in). External versions are typically thicker for better insulation.
Sliding & Bi-Fold Systems
Their standard door sizes depend on configuration. Two-panel sliders start around 1800 mm wide, while bi-folds can run up to 6400 mm for expansive openings.
Garage Doors
Standard garage door sizes include 1981 × 2134 mm and 2134 × 2134 mm. If you have a side access door, make sure it complies with fire escape regulations.
Fire Doors
Usually 2040 mm high, with widths of 626 mm, 726 mm, or 926 mm. Always check fire ratings (e.g., FD30 or FD60) and use approved hardware.
Measuring Up: The Right Way
To avoid future headaches, it’s essential to measure correctly. If you’re replacing a door, take three measurements across the width (top, middle, bottom) and three down the height (left, centre, right), using the smallest ones for accuracy.
If the old door’s already out, measure the brickwork opening or internal reveal, but remember, this may not give you the full picture.
A precise start saves time and money later, and fortunately for Bon Accord customers, we will come and measure up before work starts.
We like to think of ourselves as door experts at Bon Accord, so if we have a collection of door-focused blogs you may want to read before embarking on your home improvement project. We recommend you start with our recent blog detailing how to pick a front door colour.
Looking for a new replacement door?
From French and patio to bi-folding, we offer an incredible variety of doors inlcuding the latest front and back door designs, all of which are made to measure for the perfect fit to your home.
Want to speak with an Advisor? Give us a call on 01224 588944
Our friendly team will be pleased to help with any questions you may have.