Standard interior door sizes in the UK are heavily reliant on a 1981 mm x 762 mm slab. Alluded to as “2’6” × 6’6” in imperial, they manage an equal balance of width and accessibility, explaining their popularity in English and Welsh abodes.

We briefly touched upon the 2040 mm tall series, commonly employed at Scottish new-builds and in other areas. These are often stipulated by homeowners that seek a modern and lofty effect and typically come in widths such as 726 mm, 826 mm, and 926 mm.

If you want to compare sizes, check out the below chart, where imperial and metric labels are matched up with where each size is normally used.

If you think there’s an awful lot of types of window frames, you’re not going to believe the amount of replacement doors that exist in the world, with varied sizes. Logic tells you that bi-folding doors and a traditional front door will have contrasting sizes.

Each individual style has an individual purpose, whether that happens to be marrying home and garden or strengthening security.

Accordingly, it’s convenient to know UK standard door sizes by door type to avoid running into any installation issues and save time.

Paired doors is another term for double doors, which ordinarily span from 915 mm (3 ft) up to around 1512 mm (marginally under 5 ft), and have a typical standard height of 1981 mm (6ft 6in).

They’re often chosen to occupy large internal openings and lavish entryways, needing matching leaves for a balanced aesthetic.

French doors are rightly lauded as a classic and provide practical accessibility in and out of the house. The thickness of internal French doors is generally from 35-40mm, while external French doors are a bit thicker at around 44 mm.

The standard size of window in cm can differ, and the same goes for French doors, which vary from 36 in (approx. 914 mm) to 60 in (approx. 1524 mm) in standard door width UK. To increase the amount of glazed area, some homeowners will elect to have side panels included.

Overall door sizes for sliding and bi-folding doors rest on the number of panels they comprise and the width of the opening.

Something along the lines of 1800 mm wide is the usual size of a two-panel sliding door, increasing to about 6400 mm when seven panels are requested. Getting a suitable setup is vital in order for the door to fit into the aperture, also being mindful of stacking space.

One of two sizes is the norm for garage doors in the UK – 1981 mm × 2134 mm (6 ft 6 in × 7 ft) and 2134 mm × 2134 mm (7 ft × 7 ft). They conform to most single garages and are often specified for up-and-over and sectional designs.

For installation of a side garage door, building regulations could come into play, offering a fire exit or escape route in an emergency if it’s the only access point into a property.

Fire doors have stringent sizing requirements because of their importance. Imperial fire door widths are commonly 27 in, 30 in, and 32 in, with metric sizes normally following the 2040 mm height standard with widths of 626 mm, 726 mm, and 926 mm.

Frame setup is also influenced by fire ratings like FD30 (30 minutes) and FD60 (60 minutes). Compliance is also only achievable with intumescent seals, correct frame clearances and certified ironmongery.