# Internal doors, external doors and ironmongery | Threshen > Internal doors, external doors, frames and ironmongery in every UK standard size, imperial and metric, with the guidance to order the right one first time. Source: https://example.co.uk --- Opening January 2027 · Internal doors, external doors and ironmongery # Get the door *right* the first time Most door orders go wrong on the size, the thickness, or the parts nobody mentions — the lining, the latch, the hinges. Every door here carries its real dimensions in inches and millimetres, and the guidance to check yours before you commit. **Sizes** Imperial and metric, both labelled **Advice** 7 guides to read before you order ## What you can expect - Delivery quoted, not guessed Doors are heavy and awkward, so what delivery costs depends on how many you order and where you are. Send us your list and your postcode and it comes back priced. - Every UK standard size 8 imperial widths and 5 metric ones, and every door is labelled in both millimetres and inches. - A confirmed price before you order Prices here are guides. Ask, and we come back with the confirmed figure in writing — nothing is ordered before you have it. - Sizing and fitting guidance, free 2 calculators and 7 guides, open to read. No account, no login, no email address first. Browse the range ## Start with the door you are picturing The ranges you can order from today, and the guidance to pick the right one before you measure. - [Internal doorsOak, white, panelled, shaker and flushBrowse](https://example.co.uk/internal-doors) - [Oak doorsEngineered and solid oak, unfinished, oiled or lacqueredBrowse](https://example.co.uk/internal-doors/oak) - [Glazed doorsClear, obscure and reeded safety glassBrowse](https://example.co.uk/internal-doors/glazed) - [External doorsFront and back doors, 44mm, oak and primedBrowse](https://example.co.uk/external-doors) ### The guidance is here before the range is These are not listed until we can show real stock at a real price. The advice for each of them is written and live now, and we will source any of them if you ask. - [Frames & liningsHow to size a lining against the wall you haveRead the guidance](https://example.co.uk/door-frames) - [IronmongeryChoosing levers, latches and how many hingesRead the guidance](https://example.co.uk/door-handles) Shop by size ## Size is where door orders go wrong Four widths cover almost every UK house. Pick yours, or measure first — the opening decides, not the door that is in it now. - [686mm78" x 27"Bathrooms, en-suites, box rooms and cupboards](https://example.co.uk/internal-doors/686mm) - [762mm78" x 30"The standard UK door — most bedrooms and reception rooms](https://example.co.uk/internal-doors/762mm) - [826mm2040 x 826mmThe metric family — newer houses, and standard in Ireland](https://example.co.uk/internal-doors/826mm) - [838mm78" x 33"The widest imperial size — wide openings and clear width](https://example.co.uk/internal-doors/838mm) **Measure the opening, not the old door.** Take the width at the top, the middle and the bottom, and work from the smallest — old openings are never square, and 3mm decides whether the door shuts. The timber ones ## Oak doors Engineered oak for stability, solid oak where the movement is the point. Both are sold unfinished to match existing joinery, or ready-finished to hang. - 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 ### Oak Glazed 3-Light Door For a room with no window of its own, three glazed lights in an oak frame will borrow daylight from the hallway. - Engineered oak - 35mm ### Oak 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 ### 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 ### 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 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 ### 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 ### Oak Solid Core Glazed Door Three lights in a solid-core oak frame. The heaviest glazed door in the range, and the one to specify where a glazed leaf is going onto an opening that gets used hard. - Engineered oak, solid core - 35mm ### Oak Boarded Cottage Door A boarded oak face built on an engineered core. You get the cottage look without the seasonal movement of a leaf cut from solid timber. - Engineered oak, solid core - 35mm ### Solid Oak Shaker Door Shaker panels cut from solid oak rather than veneered onto a core: grain that runs through the timber instead of over it, and a door that moves with the seasons. - Solid oak - 35mm ### Solid Oak 4-Panel Door The Victorian four-panel door made the way the original was: solid oak throughout, with the mouldings worked into the timber rather than applied over a veneer. - Solid oak - 35mm ### Solid Oak Glazed Door Three lights set into a solid oak frame. The most expensive way to move daylight from one room to another, and the one that looks right in a house with original joinery. - Solid oak - 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 ### 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 ### 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 ### Oak 10-Light Door When a through-room loses its window to an extension, this is the usual answer. Ten lights in an oak frame, the most glass this catalogue puts in an oak door. - Engineered oak - 35mm ### Oak 4-Light Door Four long lights down an oak leaf. The vertical alternative to the three-light, and the better one where the opening is tall and narrow. - Engineered oak - 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 ### 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 ### Oak Solid Core 10-Light Door For the opening between a hall and a room that gets used hard. Ten lights on a solid-core oak leaf, and the heaviest glazed door here. - Engineered oak, solid core - 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 ### Solid Oak 6-Panel Door Six panels cut from solid oak rather than veneered. This is the closest thing here to the door a Victorian house was built with, and it behaves like one. - Solid oak - 35mm ### Solid Oak Ladder Door A contemporary horizontal-panelled shape in solid oak. Modern lines, traditional construction, and the seasonal movement that comes with it. - Solid oak - 35mm The painted ones ## White and primed Primed if you want to match a white already in the house, fully finished if you would rather not spend a weekend per door. - 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 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 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 Glazed Door Three glazed lights in a painted frame, for pulling daylight into an internal hallway or a landing that goes dark by mid-afternoon, without paying oak prices to do it. - 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 ### 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 ### White Solid Core Glazed Door Three lights over a solid lower panel in a painted frame, with a dense core in the stiles and rails. A glazed door that still feels like a door in the hand. - Solid core primed MDF - 35mm ### White Primed Cottage Door A boarded door face in painted joinery, for a cottage or a barn conversion where the timber was always going to be painted and solid oak is more than the room needs. - Solid core 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 ### 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 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 Primed 10-Light Door Ten small lights, two across and five down, over the upper two-thirds of a painted leaf. The most glass this catalogue puts in a single internal door. - Primed MDF - 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 ### 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 ### 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 ### Grey Painted Glazed Door Getting daylight through a run of grey doors without breaking the scheme with a white one. Three lights, grey frame. - Painted grey MDF - 35mm ### Grey Painted 10-Light Door Ten panes in a grey grid, which is the industrial-window look done as an internal door. Painted timber, not bare metal. - Painted grey MDF - 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 ### Grey Painted 4-Light Door Four tall lights running most of the height of a grey leaf. More glass than the three-light, and a taller, narrower proportion than the ten. - Painted grey 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 4-Light Door Four tall lights in a white primed leaf. The most daylight for the least money in this catalogue. - Primed MDF - 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 ### 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 ### White Solid Core 10-Light Door Built for an opening that gets used constantly, where a lighter glazed door would eventually rattle. Ten lights on a solid-core primed leaf. - Solid core primed MDF - 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 Why the drawings ## Drawn from the door's own millimetres Every leaf on this site is drawn straight from its real height, width and thickness, so a 686mm door is visibly narrower than an 838mm one and a 44mm external door is visibly thicker than a 35mm internal. Nothing is scaled to fill a box. That is the language this trade has always used. An architect’s door schedule, a joiner’s spec sheet and a manufacturer’s catalogue all show a door as a flat elevation, because it is the view that tells you what you need to know before it arrives on a pallet. - Width in millimetres and in inches on every door — a 762mm door is a 78" x 30" door, and you should never have to work that out yourself. - The panel layout is the style you are buying, not a generic outline. - No stock photograph of somebody else’s door standing in for ours. Choose a finish ## Timber, paint, or already done Once the size is settled, the finish is the decision that is left — and the one that decides whether you spend a weekend per door. - [AI illustrationOakEngineered for stability, solid where the movement is the point](https://example.co.uk/internal-doors/oak) - [AI illustrationWhitePrimed to match an existing white, or fully finished ready to hang](https://example.co.uk/internal-doors/white) - [AI illustrationWalnutDarker and browner than oak, where the timber is meant to be the feature](https://example.co.uk/internal-doors/walnut) - [AI illustrationGreyFactory-painted rather than primed, because the colour is the finish](https://example.co.uk/internal-doors/grey) - [AI illustrationPre-finishedOiled, lacquered or painted in the factory — hang it and walk away](https://example.co.uk/internal-doors/pre-finished) - [Everything elseUnfinished, oiled and lacquered — filter the full range](https://example.co.uk/internal-doors) The swatch faces are generated material illustrations, not photographs of stock, and they are indicative only. Oak varies leaf to leaf and no two whites are the same, so order a set together and finish them together — that is the difference between a landing that looks deliberate and one that looks collected. The part nobody mentions ## A door is more than a leaf Most door orders that go wrong do not go wrong on the door. They go wrong on the lining that was the wrong depth for the wall, the latch that would not fit where a hollow core door’s lock block sits, or the two hinges carrying a solid oak leaf that needed three. - Frames and linings sized against the wall you actually have. - What the ironmongery has to be, and how many hinges the leaf needs. - Where a requirement depends on your building, we send you to building control rather than inventing an answer. Why buy your doors here ## Six things this site does that a door catalogue does not Every one of them is a page you can open right now, not a claim about the business. - [The size finder does the arithmeticGive it the height and width of the opening and it returns the standard sizes that fit, the gap left on each edge, and whether the lining needs adjusting.Find my size](https://example.co.uk/tools/door-size-finder) - [Know the trimming allowance firstAlmost every door needs a little off somewhere, and taking too much voids the guarantee. The calculator shows what the manufacturer permits before you buy, not after.Trimming calculator](https://example.co.uk/tools/trimming-calculator) - [Every door drawn from its own dimensionsNo stock photograph of someone else's door. Each leaf is drawn at its real height, width and thickness, so a 686mm door is visibly narrower than an 838mm one.See the drawings](https://example.co.uk/internal-doors) - [7 guides that show their workingsMeasuring, trimming, linings, finishes and safety glass. Where the answer depends on your building we say so and send you to building control instead of inventing one.Read the guides](https://example.co.uk/advice) - [Build a list, then ask for the priceThere is no checkout to be pushed through. You assemble what the job needs, we come back with a confirmed price, and nothing is ordered until you say so.See how it works](https://example.co.uk/quote) - [4 widths with a page of their ownEach standard width has its own guidance — where it belongs, the clear opening it really gives, and what to do when your opening falls between two sizes.Start at 686mm (27")](https://example.co.uk/internal-doors/686mm) Before you order ## The questions that decide the order Written to be checked rather than skimmed, and honest about where a building control officer has the final say. - [Getting the size rightHow much can you trim off a door?What a door trimming allowance is, why it varies by door, how lippings and hollow cores set the limit, and what to do when the opening needs more than that.Read the guide](https://example.co.uk/advice/how-much-can-you-trim-a-door) - [Fitting and finishingWhat is the difference between a door frame, a door lining and a door casing?Door frame, lining, casing, stop and architrave explained, what each one is for, and how to work out which you need and what width to order.Read the guide](https://example.co.uk/advice/door-frames-linings-and-casings) - [Fitting and finishingWhat do I need to hang an internal door?Everything a door needs besides the leaf: hinges, latches, handles, spindles and stops, plus what a doorset actually includes and when it is worth the extra.Read the guide](https://example.co.uk/advice/hanging-a-door) - [Fitting and finishingWhat is the difference between an unfinished, primed and pre-finished door?Unfinished, primed and pre-finished compared, how to oil an oak door, and why sealing all six faces decides whether it stays straight.Read the guide](https://example.co.uk/advice/door-finishes) No small print ## What we can actually promise Four things you can check by clicking a link. Anything we cannot show you yet is not on this page. - Both size families, both labelled 8 imperial widths and 5 metric ones, and every door shows its width in millimetres and in inches. A 762mm door is a 78" x 30" door — you should never have to work that out yourself. - 7 guides that show their workings Measuring, trimming allowances, frames, finishes and safety glass. Where a requirement depends on your building, we say so and send you to building control instead of inventing an answer. - Guide prices, labelled as guide prices Nothing on this site is a quote yet. Prices are shown as guides until they are confirmed, and asking us for the real one costs nothing and commits you to nothing. You will not find review stars, delivery promises or certification badges on this site yet, because we have not earned them. They go up when they are real. Trade ## Buying by the landing, not by the leaf Trade accounts are not open yet — there is no application, no waiting list and nothing here you need to do. What is already built is the part a joiner actually uses: the numbers, on the page, without asking anyone. - Sizes, thicknesses and trimming allowances on the page, so a schedule can be priced without a phone call. - Ex-VAT figures alongside inc-VAT — every price is stored ex-VAT and the VAT class is on the product. ### Not decided yet Three things a trade buyer would ask first, and we do not have answers to any of them. They go on this page when they are real, and not before. - Trade pricing, and whether it is tiered by volume or by account - Credit terms, if any are offered at all - Delivery, which has no confirmed carrier or rate yet Not sure yet ## Tell us the opening. We will tell you the door. Measure the height and the width, and the size finder will show you the standard sizes that fit, the gap on each edge, and whether the lining needs adjusting. The trimming calculator then shows how much has to come off, and whether that is more than the door allows.