# 826mm metric internal doors — 2040 x 826mm | Threshen > Metric internal doors at 2040 x 826 x 40mm. How to tell a metric opening from an imperial one, and why the two families do not interchange. Source: https://example.co.uk/internal-doors/826mm --- # 826mm internal doors (2040 x 826mm metric) 826mm doors belong to the metric size family, normally 2040 x 826 x 40mm. They are fitted in newer UK housing and are the standard across Ireland. A metric door is taller, wider and thicker than the imperial size it looks closest to, so the two families cannot be swapped. **In this range** 34 doors **Guide price from** £38.40 inc VAT Metric doors are where a confident measurement goes wrong. Somebody measures a width of roughly 830mm, decides it is close enough to 838mm, orders the imperial door and finds it is 60mm too short in height. Height is the giveaway, not width, and it takes one measurement to settle. 34 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 Where the door is not meant to be the point, this one has nothing to catch dust or argue with the architecture. A plain flat face, honestly priced. Primed MDF - 35mm ### White 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 ### White Primed 4-Panel Door The Victorian four-panel arrangement in painted MDF: two short panels above the lock rail, two tall below, with moulding worked around each one. The period shape without oak. - Primed MDF - 35mm ### White Primed Ladder Door Horizontal panels in white primed MDF. The cheapest way to get the contemporary ladder shape, and the one most new-build refits end up buying. - Primed MDF - 35mm ### White Primed 6-Panel Door Six panels in the Victorian arrangement, moulded into a white primed face. Two short at the top, two in the middle, two long below. - Primed MDF - 35mm ### White Solid Core Flush Door The same flat painted face as a hollow core flush door, with a dense infill behind it: it sounds solid, takes a latch anywhere on the edge, and shuts with some weight to it. - Solid core primed MDF - 35mm ### White Solid Core Shaker Door Flat recessed panels, square edges, and a solid core underneath. The shaker shape specified properly, for the doors that get opened twenty times a day rather than twice. - Solid core primed MDF - 35mm ### Grey Painted Shaker Door The shaker shape in a painted mid grey rather than white. The quietest way to have coloured doors without committing the whole house to a colour. - Painted grey MDF - 35mm ### White Solid Core 4-Panel Door A moulded four-panel door with a solid core: the period shape in painted joinery, built heavy enough for a main reception room rather than a box room. - Solid core primed MDF - 35mm ### Oak Flush Internal Door In a house with no mouldings anywhere else, a panelled door looks staged. This is the timber alternative: an uninterrupted oak face, no panels. - Engineered oak - 35mm ### Grey Painted Ladder Door Horizontal ladder panels in a painted mid grey, supplied finished. For a house where the joinery is grey and the white version would be the odd one out. - Painted grey MDF - 35mm ### Grey Painted Flush Door A completely plain grey leaf. No panel, no moulding, no line on it, in the colour people choose when white feels stark. - Painted grey MDF - 35mm ### Oak Shaker Door Flat recessed panels with square edges in engineered oak. The quietest way to have timber doors in a house built after about 1930 without them reading as period. - Engineered oak - 35mm ### Oak 4-Panel Internal Door The traditional four-panel oak door, with raised mouldings. It is what most people are picturing when they say they want oak doors, and what Victorian and Edwardian houses were built with. - Engineered oak - 35mm ### White Solid Core Ladder Door For the bedroom or the home office, where a hollow leaf lets too much of the house through. Same ladder shape, solid core behind it. - Solid core primed MDF - 35mm ### Oak Ladder Door Four wide panels stacked one above the other with equal rails between them. Shaker detail turned on its side, and the door that makes a narrow opening look wider. - Engineered oak - 35mm ### Grey Painted 4-Panel Door The four-panel shape in a factory grey. A period outline without the period colour, which is the combination most Victorian terraces are being refitted with. - Painted grey MDF - 35mm ### Oak 6-Panel Internal Door The six-panel Victorian arrangement in engineered oak, for a period house with the ceiling height to carry it. - Engineered oak - 35mm ### Walnut Flush Internal Door An uninterrupted walnut face, no panels and no mouldings, on the plainest door shape there is. Darker and warmer than oak. - Engineered walnut - 35mm ### White Solid Core 6-Panel Door The six-panel outline on a solid core, primed. A period shape that closes with weight instead of sounding like a cupboard. - Solid core primed MDF - 35mm ### Oak Solid Core Flush Door A flat oak face over a dense core. The upgrade that is felt rather than seen: heavier in the hand, quieter through the wall, and it takes ironmongery anywhere on the edge. - Engineered oak, solid core - 35mm ### Grey Painted 6-Panel Door Six moulded panels in a factory grey. The most traditional outline in the least traditional colour, for a period house being brought forward rather than back. - Painted grey MDF - 35mm ### Oak Solid Core Shaker Door Square-edged shaker panels in oak with a solid core behind them. This is the specification people are describing when they say they want the doors to feel expensive. - Engineered oak, solid core - 35mm ### Oak Solid Core 4-Panel Door The four-panel Victorian arrangement in oak with a dense core, for the main rooms of a period house where the door is part of the room rather than a way out of it. - Engineered oak, solid core - 35mm ### White Primed Shaker Pair The cheapest way to make a knocked-through room feel like two rooms again when you want it to. Two plain shaker leaves in one opening, primed. - Primed MDF - 35mm ### Oak Solid Core Ladder Door The horizontal-panelled ladder shape on a solid core. Heavier to hang, quieter to live with, and the version to buy for a room you actually want to shut. - Engineered oak, solid core - 35mm ### Walnut Shaker Door Two square-edged panels in a dark walnut veneer. The plainest shape this catalogue offers, in the timber least likely to be described as plain. - Engineered walnut - 35mm ### Walnut Ladder Door Horizontal panels stacked up the leaf in dark walnut. The most contemporary shape in the darkest timber, and the pairing most often specified in a new-build refit. - Engineered walnut - 35mm ### Walnut 4-Panel Door The traditional four-panel shape with raised mouldings, in walnut rather than the oak it is usually cut from. - Engineered walnut - 35mm ### Oak Solid Core 6-Panel Door Six moulded oak panels on a solid core. The period shape, with the weight a period door would actually have had. - Engineered oak, solid core - 35mm ### Walnut 6-Panel Door The Victorian six-panel arrangement in walnut: two small panels over two long ones over two short. More line-work than any other shape here. - Engineered walnut - 35mm ### White Primed Glazed Pair Between a kitchen and a dining room, a single door makes the two rooms separate. Two glazed leaves meeting in the middle of one opening do not. - Primed MDF - 35mm ### Oak Shaker Pair For a dining room you want to shut properly rather than look through. Two solid shaker leaves fill one opening, unglazed. - Engineered oak - 35mm ### Oak Glazed Pair A glazed oak pair for a wide opening. The most timber and the most glass in one place that this catalogue offers, and the most expensive thing on it. - Engineered oak - 35mm No doors match these filters yet. Clear a filter to widen the search. ## How to tell metric from imperial in under a minute Measure the height of the opening. Imperial doors are 1981mm tall. Metric doors are 2040mm. That is a 59mm difference, which is far too much to trim and far too obvious to miss once you have the tape on it. Thickness is the second tell. Imperial internal doors are usually 35mm, metric ones 40mm. A 40mm leaf in a lining rebated for 35mm will not sit right against the stop. | | Imperial family | Metric family | | --- | --- | --- | | Height | 1981mm (78") | 2040mm | | Common widths | 610, 686, 762, 838mm | 526, 626, 726, 826, 926mm | | Typical thickness | 35mm | 40mm | | Usually found in | UK housing built before the 1990s | Newer UK housing, and standard across Ireland | ## Why you cannot substitute one for the other The height difference alone rules it out. You cannot add 59mm to a door, and taking 59mm off a metric door to fit an imperial opening removes far more than any manufacturer allows — on most doors it would cut straight through the bottom rail. If you have a mixed house, which happens after an extension, buy each opening the door it needs and accept that the two will differ slightly in height. That reads far better than a door that has been butchered to fit. ## The rest of the metric range 826mm is the most-fitted metric width, filling the role 762mm plays in the imperial family. The narrower sizes cover the same jobs 686mm and 610mm cover in an older house: bathrooms, box rooms and cupboards. - 2040 x 526mm — cupboards and very narrow openings. - 2040 x 626mm — box rooms, cloakrooms and store cupboards. - 2040 x 726mm — bathrooms, en-suites and smaller bedrooms. - 2040 x 826mm — the standard room door. - 2040 x 926mm — wide openings and accessible routes. ## More internal doors [Back to all internal doors](https://example.co.uk/internal-doors)