UK single garage dimensions: how to measure what yours will actually take
Updated 19 September 2026 · 7 min read
Published by CAVE4MAN — storage, workshop and man-cave kit for UK home garages. The shop is not open yet.
There is no official UK single garage size, and the ones built since the mid-twentieth century are tight enough that many will not hold a modern car with a door open. Measure your own: clear internal width at the narrowest point, with the door up, to the nearest obstruction. Subtract the car and what is left is your storage space.
Why nobody can tell you the standard size
Search for the size of a UK single garage and you get a different answer on every page, usually to the centimetre, usually with nothing behind it. That is because there is no published standard. Garages on British housing were built to whatever the developer drew at the time, across the best part of a century, and the drawings did not grow as the cars did. A garage from the sixties and one from a nineties estate can differ by the width of a car door.
Cars grew. A family hatchback today is wider and longer than the car the garage was drawn around, and mirrors stick out further. So the honest version of the question is not what a standard garage measures but what yours will take with your car in it. That is a tape measure job, and it takes twenty minutes. The rest of this guide is the twenty minutes.
Measure to the obstruction, not the wall
Running a tape across the bare walls and calling that the width is where the measuring goes wrong. A garage is full of things that are not walls. The up-and-over door has a track down each side and a mechanism that swings inward when the door goes up. The consumer unit and the meter box are on the wall by the door. The boiler, if the garage has one, is at head height with pipework below it. There may be a pier halfway down one side, a downpipe in a corner, a step up to the house door.
Every one of those reduces what a car or a shelf can occupy, and none of them show on a wall-to-wall tape. So measure to the thing that sticks out furthest at the height that matters. For the width, that height is where the car door and the car mirror are. For the depth, it is the lowest part of the open garage door at the front and the deepest obstruction at the back. Do it with the door up, because the door is the biggest obstruction of all and it only exists when it is open.
| Obstruction | Where it usually is | What it steals |
|---|---|---|
| Up-and-over door, open | Across the ceiling near the front | Height and the first stretch of depth |
| Door tracks and springs | Both side walls by the door | Width, at car-door height |
| Consumer unit and meter box | Side wall near the door | Width and a clear zone in front of it |
| Boiler and pipework | One side wall, head height | Width above bonnet level |
| Pier or buttress | Partway down a side wall | Width at one point, which sets the width |
| Step or door to the house | Back or side wall | Depth, plus room for it to open |
The order to take the measurements in
Take them in this order and write each one on a sketch as you go. The order matters because the later measurements depend on the earlier ones, and because the narrowest point is only obvious once you have walked the whole length with the tape. A garage that is fine at the front and pinched by a pier at the back is a garage that is pinched.
- 1Put the door fully upEvery measurement is taken with the garage door in the open position, because that is the state the garage is in when a car goes in or out. A closed door hides the track and the mechanism, and those are what you will hit.
- 2Find the narrowest clear widthWalk the length of the garage with the tape held at the height of your car door handle. Measure between whatever sticks out furthest on each side. The smallest number you get is the width of the garage. Ignore the larger ones.
- 3Measure the clear depthFrom the inside face of the open door, or the lowest part of its mechanism if that hangs lower, to the back wall or whatever is fixed to it. If there is a step or a door to the house at the back, measure to the arc it needs to open.
- 4Measure the height under the open doorThis is the lowest point in the front part of the garage and it is the number that decides whether anything tall can live near the door. Then measure to the lowest fixed thing further back, which is usually a light fitting or a joist.
- 5Measure the carLength from bumper to bumper. Width with the mirrors folded and again with them out. Then open the driver’s door to the point you actually get out through and measure from the car body to the door edge. That last one is the number people forget.
- 6Draw itA rough plan on paper with all six numbers on it. You will refer back to it every time you consider anything for the garage, and it stops you buying by eye.
Subtract the car and see what is left
Now the arithmetic. Take the narrowest clear width and subtract the car’s width with the mirrors folded. What is left is the total gap, and it has to be split between the two sides. The driver’s side needs enough of it for you to open the door and get out; compare the gap against the door-swing measurement you took. Whatever is left on the passenger side is the only floor-level storage width you have, and in a great many British single garages it is nothing at all.
Depth is the same sum. Clear depth minus car length gives you what is left at the back, and some of that is needed to walk past the boot to the back wall. If the answer is a gap you can only reach from the passenger side with the car in, then the back wall is not storage you can use daily. It is storage for things you fetch when the car is out.
| Gap | How it is worked out | What it decides |
|---|---|---|
| Driver’s side | Clear width minus car, minus passenger gap | Whether you can get out |
| Passenger side | Whatever the driver’s side leaves | Floor-level shelving or nothing |
| Behind the car | Clear depth minus car length | Back-wall storage and whether you can reach it |
| Above the bonnet | Height under joists minus bonnet height | Wall storage over the front of the car |
| Above the roof | Height to lowest fixed thing minus car roof | Ceiling storage and bike hooks |
What fits in a garage with no floor space to spare
When the sums come back with nothing either side of the car, the garage is not a lost cause; it is just a garage where storage goes up rather than out. The wall above bonnet height at the front, the back wall above the level of the boot, and the ceiling between the joists are all clear of the car. Wall-fixed hooks for the long awkward things, shallow wall shelving for the middling things, and a bike mount that swings flat against the wall when the car needs the space are what a tight single garage can actually take.
The floor still gets one upgrade, because interlocking tiles add nothing to the footprint. Freestanding shelving is the thing to be careful with: a five-tier unit is deep enough that it needs a real gap to stand in, so it belongs on the passenger side only if the passenger-side gap will take it with the car in. If it will not, it goes across the back wall, and only if you can reach the back wall.
The one thing not to do is buy the storage first and measure afterwards. The sketch you made is the specification. Anything you consider for the garage either fits the gaps on it or it does not, and that is a far better test than a photograph of somebody else’s double garage. It also settles arguments with yourself in the shop, which is where most garage kit that never fitted was bought.
Common questions
- What size is a standard UK single garage?
- There is no official standard. The figures quoted online vary widely between sources because garages were drawn to whatever the developer chose across decades of house building. Measure your own garage at its narrowest clear point with the door open, rather than relying on a quoted size that may not describe it.
- Will a modern car fit in a UK single garage?
- Often it will fit, but not with a door open. Many single garages built from the mid-twentieth century onward were drawn around smaller cars than are sold now. Measure your clear width at car-door height, subtract the car with mirrors folded, and check the driver’s side gap against the door swing you actually need to get out.
- Should I measure a garage with the door open or closed?
- Open. An up-and-over door swings inward and sits under the ceiling when it is up, and its track and mechanism sit on both side walls. Those are the biggest obstructions in the garage and they are only in position when the door is open, which is the state the garage is in whenever a car moves.
- How much room do I need beside a car in a garage?
- Enough to open the driver’s door to the point you can get out, which is a measurement of you and your car, not a fixed figure. Open the door as far as you need, measure from the car body to the door edge, and compare that with the gap left after subtracting the car from the garage’s narrowest clear width.