Barn door track length: opening, leaf and rail
Updated: 21 October 2026
You know the doorway width, and you are about to choose a 152 cm, 167 cm, 183 cm or 200 cm rail from the kits on amazon.co.uk. Barn door track length is three measurements, not one. The opening, the leaf and the rail are different numbers, and a rail the width of the hole leaves the door parked across the doorway. The [sliding door comparison](/hub/door-and-window-security/sliding-door) lists which of those lengths also print a maximum door width. Peter F. used Häfele’s published rule, Arborfield Joinery’s smaller overlap, and arithmetic on the eight listings, dated 19 October 2026. They are not a lab measurement of your wall. A qualifying purchase through an amazon.co.uk link can earn a commission at no extra cost to you.
You know the doorway width, and you are about to choose a 152 cm, 167 cm, 183 cm or 200 cm rail from the kits on amazon.co.uk. Barn door track length is three measurements, not one.
You know the doorway width, and you are about to choose a 152 cm, 167 cm, 183 cm or 200 cm rail from the kits on amazon.co.uk. Barn door track length is three measurements, not one. The opening, the leaf and the rail are different numbers, and a rail the width of the hole leaves the door parked across the doorway. The sliding door comparison lists which of those lengths also print a maximum door width. Peter F. used Häfele’s published rule, Arborfield Joinery’s smaller overlap, and arithmetic on the eight listings, dated 19 October 2026. They are not a lab measurement of your wall. A qualifying purchase through an amazon.co.uk link can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Track length | Door width | Stated load | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  WINSOON WINSOON 183 cm big-wheel kit | 2 × 92 cm | Under 92 cm | 105 kg | 9.4 | about £39.99 | View offer |
| Best value |  WOLFBIRD WOLFBIRD 183 cm black kit | 183 cm | 91.5 cm | n/a | 9.2 | about £28.99 | View offer |
 WOLFBIRD WOLFBIRD 200 cm black kit | 200 cm | 100 cm | n/a | 9.2 | about £29.99 | View offer |
On this page
Three widths, not one
People order the rail that matches the hole they can see. A 760 mm doorway then seems to need a 152 cm kit because 5 ft sounds close, or a 6 ft kit because 183 cm sounds like a standard opening. The leaf has to be wider than the opening so it covers the gap when it is shut, and the rail has to be long enough for that leaf to slide clear and park on the wall beside the frame. Häfele’s UK guide puts the track at least twice the door width. A rail equal to the opening fails that test before you look at the brand.
The wall beside the opening has to exist. The Sandwich Handyman describes a clear run about equal to the door width, which is the parking space. A socket, a switch or a return wall in that zone is a failed length, even when the steel is long enough on paper. If there is no wall to park on, a longer rail from this set will not invent one. You would be looking at a different arrangement, such as a pocket or a pair, and none of those is in this comparison.
Height is a second constraint, dealt with after the length is honest. The black WOLFBIRD bullets ask for at least 13 cm from the top of the door to the ceiling. A rail that is the right length still will not hang if the ceiling is tighter than the kit you bought. The drill sequence, once the length is chosen, is on the how to fit a sliding barn door page.
How much overlap to plan
Two UK guides publish different overlaps, and both should stay visible. Häfele asks for at least 50 mm each side, so the leaf is at least 100 mm wider than the opening. Arborfield Joinery’s 2026 guide uses about 25–30 mm each side, about 50–60 mm of extra leaf in total, and prefers a one-piece rail. Neither figure is a regulation. Häfele’s is the more cautious published overlap. Arborfield’s is the other published figure. If you plan the smaller overlap and the kit’s own maximum is tighter still, the kit maximum wins, because that is the door the seller says the hangers will take.
A worked caution, labelled as arithmetic and not a test: a 762 mm internal leaf plus 50 mm each side is 862 mm. Twice that leaf is about 1,724 mm of track. A 152 cm rail cannot do it. A 167 cm rail is still short of 1,724 mm. A 183 cm rail is only enough if the leaf stays at or under about 915 mm, which is exactly where the 91.5 cm and 92 cm titles in this set sit. Use your own leaf, not 762 mm, if the door in the room is a different width. The order of those checks, before you fall in love with a finish, is the sliding barn door kit buying guide.
What these rails can actually cover
Read the kit maximum after the sum, and throw the title out if that maximum is smaller than the leaf. The 152 cm WOLFBIRD stops at 76 cm. A 762 mm door plus Häfele’s 50 mm each side is already 862 mm, past that cap, and twice a 762 mm leaf is about 1,524 mm, which is the whole rail with nothing to spare. That kit is for a narrower leaf than a typical UK internal door plus overlap. It prints 150 kg, which does not lengthen it.
CCJH’s 167 cm rail stops at 83.5 cm. Twice 83.5 cm is 167 cm, so that maximum uses the whole rail, with no spare, and it is not the default for a wider leaf plus overlap.
The 183 cm titles that print a width sit on the same edge. The 183 cm WOLFBIRD allows up to 91.5 cm, TSMST allows up to 92 cm, and WINSOON is for a door under 92 cm on two 92 cm rails. Twice 91.5 cm is 183 cm. Signstek’s 183 cm file prints no door width, so the rail length alone does not tell you the leaf. The 200 cm WOLFBIRD allows a 100 cm leaf in the title. Twice 100 cm is 200 cm, so there is again no spare travel if you follow the minimum strictly. It also prints no load.
Height and the wall the door parks on
Buyers shortened WOLFBIRD rails with a hacksaw. Cutting removes steel you do not have room for. It never fixes a rail already shorter than twice the leaf, and it does not raise a 76 cm door cap.
The side wall has to stay clear. A towel rail or a light switch in the park zone is covered every time the door is open. Measure that zone as the door width. Above the leaf, the black WOLFBIRD kits state at least 13 cm from the door top to the ceiling. Häfele’s general note is at least 50 mm above the opening, and the larger figure on your kit is the one to obey.
If the opening has no side wall, or the leaf you need is wider than 100 cm, these eight rails have run out of length. A trade track around 2 m, such as the Henderson Rustic 100 listed by SD Hardware at about £213.13 including VAT, is the kind of product that prints a longer rail and a door range. It is not an Amazon row in this comparison. Measure twice, then order the title whose own maximum is still above your leaf.
Common questions
Is the track the same length as the doorway?
No. The track has to let the leaf slide clear of the opening. Häfele’s published rule is at least twice the door width. A rail the same width as the hole leaves the door covering the doorway when you try to park it. The opening, the leaf and the rail are three different numbers.
How much wider should the door be than the opening?
Häfele says at least 50 mm each side, so at least 100 mm overall. Arborfield Joinery says about 25–30 mm each side. They disagree, and neither is a law. Then check the kit’s own maximum, which can be tighter than either guide. If the kit maximum is the smaller number, that maximum wins.
Will a 152 cm kit run a standard internal door?
Not once you add overlap. The 152 cm WOLFBIRD stops at 76 cm. A 762 mm leaf plus 50 mm each side is 862 mm, which is already over that cap. It suits a narrower leaf that the listing actually allows. A printed 150 kg does not lengthen that rail.
Is 183 cm enough for a 92 cm leaf?
Only at the limit. Twice 91.5 cm is 183 cm, and twice 92 cm is 184 cm. The 183 cm titles that print a width stop at 91.5 cm or 92 cm, or under 92 cm. There is no spare travel if the leaf is already on that cap. Use the leaf you will hang, not the bare opening.
Can I cut a longer rail down?
Yes, if the rail is too long for the wall and the leaf is still inside the kit’s maximum door width. Reviews describe a hacksaw cut on WOLFBIRD rails. Cutting does not add length, and it does not change that printed cap. It also does not repair a rail that is already shorter than twice the leaf.
What if there is no wall beside the opening?
The leaf has nowhere to park. A longer barn rail in this set does not solve a return wall or a corner tight against the frame. You need a different door arrangement, and these eight kits are single top-hung rails, not pocket kits. A socket in the park zone disappears behind the leaf.
How much space do I need above the door?
The black WOLFBIRD bullets ask for at least 13 cm from the top of the door to the ceiling. Häfele’s general figure is at least 50 mm above the opening for track and brackets. Use the larger figure printed on the kit you are fitting. A rail of the right length still will not hang if the ceiling is tighter.
Related pages
Sources
Public UK sources for door hardware and security rules, plus the amazon.co.uk listings in this set. Last checked 21 October 2026.
- GOV.UK, Approved Document Q (2015) (retrieved 21 October 2026)
- BSI, PAS 24:2022+A1:2024 (retrieved 21 October 2026)
- NBS, BS EN 1527:2019+A1:2021 (retrieved 21 October 2026)
- Metropolitan Police, door security advice (retrieved 21 October 2026)
- Häfele UK, sliding barn door kits (retrieved 21 October 2026)
- Runners UK, how to choose sliding door gear (retrieved 21 October 2026)
- The Sandwich Handyman, fit a sliding barn door (retrieved 21 October 2026)
- TRADA, fire doors (retrieved 21 October 2026)