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Search for a single garage door and you get a wall of price lists, most of them for up and over doors in catalogue sizes. A roller door does not come in catalogue sizes; it is made to the opening, which is why the question is not which size to buy but which door fits your opening and how to measure it. This guide is the single door companion to our double garage roller doors post: what counts as a single in the UK, which of our three ranges suits which width, the headroom and side room to check, the six measurements, and, because it is published on Christmas Day, what ordering over the holidays means for a January fit.
What counts as a single garage door in the UK
The classic British single garage door is 7ft wide by 6ft 6in high, which is 2,134mm by 1,981mm, and a great many garages built from the 1960s onwards have an opening close to that. Later houses stretched it: openings of 2.3m to 2.5m wide and 2.1m to 2.2m high are common on homes built since the 1990s, because cars got wider. Anything much over 2.5m is heading into double territory, and anything under about 2.1m makes a modern car a tight fit, which is one reason people convert or widen. For a roller door none of these are catalogue sizes. The curtain is cut to your width and the guides to your height, so a 2,134mm opening and a 2,470mm opening are simply two different orders at two different prices.
Which TWF roller door fits a single opening
| Range | Width, including guide runners | Height, including top box | Slat | Top box | From, inc VAT |
|---|---|---|---|---|---|
| Standard 55 | 1,200mm to 2,500mm | Up to 2,400mm with a 205mm box | 55mm x 9mm insulated | 205mm, 250mm option | £505 |
| Premium 55 | 1,200mm to 2,650mm | Up to 2,550mm with a 250mm box | 55mm x 12.5mm insulated | 250mm | £605 |
| Classic 77 | 1,500mm to 4,950mm | Up to 2,600mm with a 300mm box | 77mm x 18mm insulated | 300mm | £815 |
For a typical single opening, Standard 55 is the value choice and covers everything up to 2,500mm. Premium 55 uses a deeper slat for a more solid feel and reaches 2,650mm, which takes in the wider modern single. Classic 77 is built for bigger spans; it fits a single from 1,500mm but earns its price on wide singles and doubles, and our 55mm versus 77mm slat guide explains the difference in the curtain. The from prices are the ones the Garage Door Builder showed on the day this guide was written; the builder prices your exact size and colour in a minute.
Headroom: where the top box goes
The curtain rolls up into a top box above the opening, and the box needs headroom: 205mm for Standard 55 (a 250mm box is available where extra height is needed and headroom allows), 250mm for Premium 55 and 300mm for Classic 77. The box can sit behind the lintel, inside the garage, when there is enough internal headroom, or below the lintel, inside the opening, when clearance is limited. Fitting it below costs you that much door height, so a 2,000mm opening with a 205mm box below the lintel leaves 1,795mm to drive under, which is why the sixth measurement, clearance above the lintel, matters more than people expect. The heights in the table above include the top box.
Side room and the guide runners
The width the builder asks for includes the guide runners, which fix to the face of the brickwork on either side of the opening when the door is face fitted, or inside the reveal when it is reveal fitted. So the question on each side is how much clear return there is from the edge of the opening back to the nearest wall, pipe or obstruction. Two measurements, left and right, taken from inside looking out, answer it. Where a garage has a downpipe, a meter box or a light right beside the opening, note it in the order; it is usually fine, but it is better known before the door is made. Our made to measure guide explains face fit and reveal fit in more detail.
Measuring a single opening in six steps
Our measuring guide uses six measurements, all in millimetres, taken from inside the garage looking out: the opening width at the top, brick to brick; the width at the bottom, brick to brick, at the tightest point if the floor is uneven; the height from the finished floor to the underside of the lintel, on the highest side if the floor slopes; the left side return; the right side return; and the clearance above the lintel for the top box. Measure to the brickwork, not to trims, write each figure down, and use the smallest where the opening is out of square. A roller door cannot be made larger once it is manufactured, so check the figures twice, and if anything looks odd, send them to us before you order. Our post on how to measure a garage door walks through the same steps with the mistakes people make.
Electric as standard: controls and the extras worth having
Every TWF roller door is electric, with key switch controls as standard and a winding handle for power cuts. The extras in the builder that most single door buyers add, at the prices shown on the day this guide was written: a safety edge kit, £135 hard wired or £180 wireless, which brings two remote controls with it; an extra remote at £20; the external manual override kit at £115 if the roller door is the only way into the garage; and delivery to mainland England and Wales at £65, or free collection from our Great Yarmouth workshop. Sixteen colours are chosen in the builder, and our colours by finish guide compares them.
One single door, two singles or one double
A garage with two single openings side by side has three options: two single roller doors, one in each opening; one wide door across both, which needs the pier between them removed and a new lintel; or one wide door on an opening that has already been converted. Two singles are the cheaper and simpler route, with no building work, and each door can be opened on its own. Our double garage roller doors guide covers the wide door, and our post on converting two garage doors to one covers the building work and what it involves.
DIY kit or fitted by TWF
The DIY kit arrives with the curtain, guides, top box, motor and controls, most installations take between 4 and 6 hours with two people and basic tools, and every DIY kit carries a 5-year warranty. In Norfolk and Suffolk we also fit: a fitted roller door starts from £949 inc VAT including remote controls, a safety edge and fitting, a roller door generally takes 3 to 5 hours to install, every installed door has a 5-year parts and labour warranty, and the survey is free. The honest difference is time and tools on your side against a fixed price and a warranty on ours, and our Norfolk page explains where we fit.
Ordering over the holidays for a January fit
This post goes live on Christmas Day, so a word on timing. The builder works whenever you do, and every door is made to measure in our Norfolk workshop after you order. Orders are usually delivered within 4 weeks, so a door priced and ordered over the holidays is, in the normal run of things, a January delivery and a January fit: measure once the garage is clear of the Christmas clutter, order when you are ready, and the kit follows. We do not promise a date here, because the lead time depends on the order book at the time, and our lead times guide explains what can lengthen it. If you would rather we measured and fitted the door in Norfolk or Suffolk, book a free survey and we will take the measurements ourselves in the new year.
FAQs
What size is a standard single garage door in the UK?
The classic British single garage door is 7ft wide by 6ft 6in high, which is 2,134mm by 1,981mm, and many houses built since the 1990s have wider openings of 2.3m to 2.5m and heights of 2.1m or more. A roller door is not made in standard sizes, though: the curtain and guides are cut to your opening, so the measurements matter more than the label.
Which TWF roller door fits a single garage opening?
Standard 55 covers openings from 1,200mm to 2,500mm wide and is the value choice for most singles. Premium 55 uses a deeper slat and reaches 2,650mm, which takes in the wider modern single. Classic 77 starts at 1,500mm and runs to 4,950mm, so it fits a single but is built for wide singles and doubles. All three are made to measure.
How much headroom does a single roller garage door need?
The top box needs 205mm for Standard 55, 250mm for Premium 55 and 300mm for Classic 77. It can sit behind the lintel inside the garage where there is enough internal headroom, or below the lintel inside the opening where clearance is limited, which reduces the drive through height by the depth of the box.
Can I fit a single roller garage door myself in a day?
Most people can. Our DIY kit arrives with the curtain, guides, top box, motor and controls, most installations take between 4 and 6 hours with two people and basic tools, and every DIY kit carries a 5-year warranty. In Norfolk and Suffolk we also fit, and a roller door generally takes our engineers 3 to 5 hours.
How long does a made to measure single roller door take to arrive?
Every door is made to measure in our Norfolk workshop after you order, and orders are usually delivered within 4 weeks. The lead time depends on the order book at the time, so we do not promise a date here; our lead times guide explains what can lengthen it and the builder shows the current position when you order.
Can I replace two single garage doors with one double door?
Yes, but it is building work as well as a door. The pier between the two openings has to come out and a new lintel has to go in before a wide Classic 77 door can span the opening. Two single roller doors, one in each opening, need no building work and can be opened independently, which is why many people keep two.
Key takeaways
- A UK single opening is usually 2.1m to 2.5m wide; a roller door is made to it, not bought in a size.
- Standard 55 to 2,500mm, Premium 55 to 2,650mm, Classic 77 from 1,500mm to 4,950mm.
- Allow 205mm, 250mm or 300mm of headroom for the top box, behind or below the lintel.
- Six measurements in millimetres, measured twice, are all the builder needs.
- Made in Norfolk after you order and usually delivered within 4 weeks: a holiday order is a January fit.
Conclusion
A single garage roller door is the simplest door we make and the one most people fit themselves in an afternoon. Measure the opening in millimetres, let the builder pick the range from the width, allow for the top box, and choose the extras that matter to you. Price it in the builder today and it will be made in Norfolk in the new year, or book a free survey and we will do the measuring. Either way, by the end of January the old door is gone.
Written by the TWF team, who have manufactured and fitted roller garage doors from Norfolk for over 25 years. Last updated: 25 December 2026.
