UK internal door sizes chart (imperial)
Most UK homes built before the 1990s have imperial door frames and most new doors are still sold in imperial sizes. Every size below is 1981mm (6'6") high, apart from the taller 6'8" door. The last column shows how many doors in our own range come in each size, which gives a good idea of how common each one is.
| Size (mm) | Feet and inches | Inches | Where it's used | In our range |
|---|---|---|---|---|
| 1981 x 457mm | 6'6" x 1'6" | 78" x 18" | Airing cupboards and small storage | 8 |
| 1981 x 533mm | 6'6" x 1'9" | 78" x 21" | Cupboards and narrow en suites | 17 |
| 1981 x 610mm | 6'6" x 2'0" | 78" x 24" | Cupboards, en suites and box rooms | 60 |
| 1981 x 686mm | 6'6" x 2'3" | 78" x 27" | Bathrooms and smaller bedrooms | 156 |
| 1981 x 711mm | 6'6" x 2'4" | 78" x 28" | Less common, found in some older homes | 7 |
| 1981 x 762mm | 6'6" x 2'6" | 78" x 30" | The UK standard: bedrooms, lounges and kitchens | 164 |
| 1981 x 838mm | 6'6" x 2'9" | 78" x 33" | Wider openings, main rooms and easier access | 164 |
| 2032 x 813mm | 6'8" x 2'8" | 80" x 32" | Taller openings | 25 |
If you're replacing doors in a typical semi or terrace, the chances are your bedrooms and living room take 1981 x 762mm doors, the bathroom takes 1981 x 686mm and any cupboards take 1981 x 610mm or narrower. Don't assume, though. Two doors that look the same can be 25mm apart, so measure every opening.
Metric internal door sizes
Metric doors are 2040mm high, about 59mm taller than an imperial door. You'll mostly find metric frames in newer builds and some extensions. The widths step up in 100mm jumps:
| Size (mm) | Where it's used | In our range |
|---|---|---|
| 2040 x 526mm | Cupboards and storage | 10 |
| 2040 x 626mm | Cupboards and en suites | 28 |
| 2040 x 726mm | Bathrooms and bedrooms | 77 |
| 2040 x 826mm | The metric standard for most rooms | 77 |
| 2040 x 926mm | Wide openings and step-free access | 16 |
A metric door is too tall for an imperial frame and an imperial door leaves a gap in a metric frame. That's far more than a door can safely be trimmed. If you want to change from one to the other, the frame or lining has to change too.
Internal door thickness
Thickness matters because the door has to sit flush against the stop in the frame. A 44mm fire door won't sit properly in a frame built for a 35mm door without the stop being moved. If you're unsure which doors in your home need to be fire doors, read our fire door regulations guide.
How to measure for an internal door
Measure the opening, not the old door. Old doors are often planed down over the years, so copying them can leave you with a door that's too small. Take the old door off if you can, then:
- Measure the width three timesInside the frame, from one side of the rebate to the other, at the top, middle and bottom. Write down the smallest.
- Measure the height three timesFrom the top of the frame to the floor, on the left, in the middle and on the right. Again, keep the smallest.
- Measure the rebate depthFrom the face of the frame to the door stop. That tells you which door thickness fits.
- Check it's squareMeasure corner to corner both ways. If the two numbers differ by more than a few millimetres, the frame is out of square and the door will need careful trimming.
- Note the floorNew carpet, tiles or underfloor heating can raise the floor. Allow for it now, not after the door is hung.
Then match your smallest measurements to the nearest size in the chart. Doors come in standard sizes and can be trimmed down a little to fit, but every door has a limit on how much can come off each edge. That limit is on the product page and in the maker's instructions. For step-by-step photos, see our blog post on how to measure for internal doors. If the frame is being replaced too, read how to measure for a door frame replacement.
Find your door size
Use your smallest width and height, in millimetres. (Inches work too.)
The finder allows for normal trimming. It's a guide, not a survey. If your numbers fall between sizes or the frame is out of square, a quick measuring visit saves a costly mistake.
Odd sizes and older homes
Victorian and Edwardian terraces across Leeds and Bradford often have openings that don't match any standard size or frames that have dropped over a hundred years. You've got three options:
- Trim a standard door if the opening is only a little smaller than a stock size and within the door's trimming limits.
- Fit a new frame or lining sized for a standard door. This is often the neatest fix and opens up the whole range.
- Order a bespoke door made to your opening. It costs more and bespoke doors can't be returned for a change of mind.
We cover this in more depth in door sizing issues in older Leeds homes. Once you know your sizes, see what door fitting costs or get our fitters to hang them.
