838mm internal doors (78" x 33")
838mm is the widest standard imperial internal door, quoted as 78" x 33". It is specified for wide openings, main reception rooms, and routes that need more clear width than a 762mm door can give. A wider leaf is also a heavier one, which changes the hinges and the frame fixings.
Most people arriving at 838mm are here for one of two reasons: an opening that is genuinely wider than standard, or an accessibility requirement that a 762mm door will not satisfy.
They are different problems, and only one of them is solved by the door on its own.
Showing all 5 doors
Prices are guide prices including VAT, taken from the smallest size and plainest finish of each door. They are not an offer to sell — confirm the price for your size and finish before ordering.
White Flush Internal Door
A plain flat door with nothing to catch dust or argue with the architecture — the honest choice for a modern house, a utility room, or anywhere the door is not the point.
- Primed MDF
- 35mm
Guide price from£38.40inc VAT11 sizesWhite Primed Shaker Door
Clean two-panel shaker lines in a white primed finish — the most forgiving door in a mixed-age house, and the cheapest way to make a landing look deliberate.
- Primed MDF
- 35mm
Guide price from£50.40inc VAT11 sizesOak 4-Panel Internal Door
A traditional four-panel oak door with raised mouldings — the default choice for Victorian and Edwardian houses, and the one most people picture when they say "oak door".
- Engineered oak
- 35mm
Guide price from£106.80inc VAT11 sizesOak Glazed 3-Light Door
Three glazed lights in an oak frame — for borrowing daylight from a hallway into a room that has none of its own.
- Engineered oak
- 35mm
Guide price from£150inc VAT7 sizesOak Cottage Ledged Door
Vertical boards with ledges across the back — a genuine cottage door for period properties, where a moulded panel door would look wrong.
- Solid oak
- 35mm
Guide price from£198inc VAT4 sizes
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Accessibility and clear opening width
The measurement that governs whether someone can get through a doorway is the clear opening width: the usable gap with the door standing open. It is always less than the leaf width, because the frame, the stop and the thickness of the open leaf all take a share.
Approved Document M sets clear opening widths for dwellings, and the required figure depends on the width of the approach — a doorway off a narrow corridor needs a wider clear opening than the same doorway off a generous hall. [VERIFY: Approved Document M, current edition] and confirm the figure against your own layout before ordering.
Where clear width is critical, the frame and the hinges do as much work as the leaf. Rising butt hinges or wide-throw hinges let the door swing fully clear of the opening, which recovers width that a standard hinge gives away.
A wider door is a heavier door
Leaf weight scales with area, so an 838mm door is meaningfully heavier than the 762mm version of the same product. On a solid core or a solid oak leaf that weight starts to test a two-hinge hanging.
Fit three hinges rather than two on the wider sizes, and check what the existing frame is fixed to before you hang anything heavy on it. A lining that was pinned to a stud partition and has carried a hollow core door for 30 years is not automatically ready for a solid oak one.
If 838mm is still not wide enough
Beyond 838mm the imperial range stops, and the usual answer is a pair of doors rather than one very wide leaf. A pair of 610mm or 686mm doors on a wide opening gives you the width without a leaf so heavy it drops on its hinges, and it lets you open one side day to day and both when you need them.
Sliding and pocket doors are the other route where swing space is the constraint rather than width.