Pocket Door Size Guide: Standard UK Sizes & Dimensions

Pocket doors typically stand 1,981mm to 2,040mm tall, with single door leaves ranging from 610mm to 926mm wide and double (bi-parting) configurations combining two leaves for openings up to 1,850mm or more. Because a pocket door slides into a cavity inside the wall rather than swinging on hinges, the rough opening you need to build is roughly double the door's width — which is where most sizing mistakes happen. This guide covers standard sizes, how to calculate your rough opening, how to measure correctly, and what to check before you order.

What Is a Pocket Door, and When Should You Use One?

A pocket door is a sliding door that retracts fully into a cavity built inside the wall, rather than swinging open into the room on hinges. This makes it a genuinely space-saving option there's no swing radius to plan around, so it works well in bathrooms, hallways, and as a divider between open-plan spaces where a hinged door would eat into usable floor area.

The key difference from every other door type in terms of sizing is that a pocket door needs a rough opening roughly double its own width, since the wall cavity has to be wide enough to swallow the entire door leaf when it's open. This is the single biggest source of confusion when planning a pocket door installation, and it's the reason the sizing steps below go further than a standard door size guide.

What Are the Standard Pocket Door Sizes?

Standard single pocket door leaves range from 610mm to 926mm wide and 1,981mm to 2,040mm tall; double bi-parting configurations combine two matching leaves for a combined width of up to around 1,850mm. Always confirm exact figures against the specific kit system you're buying, since sizing conventions vary slightly between manufacturers.

What sizes do single pocket doors come in?

What sizes do double (bi-parting) pocket doors come in?

Bi-parting doors slide in opposite directions and meet in the centre when closed — a good option for a wide opening or a room-divider-style installation where you want a more symmetrical look than a single sliding leaf gives you.

What Size Rough Opening Do I Need for a Pocket Door?

As a general rule, the rough opening width needs to be roughly double the door leaf's width plus an allowance for the frame and running gear, and the rough opening height needs to be the door height plus an allowance for the track and header — always confirm the exact figures against your specific kit's installation manual before framing the wall. This is the step that catches people out most often, since it's easy to assume the rough opening only needs to match the door itself.

Worked rough opening sizes

These figures are illustrative, based on common kit-system allowances — every manufacturer publishes its own exact rough opening specification for each door size, and it's this figure (not the door size alone) you should build your stud wall to.

How Do I Measure for a Pocket Door?

Measure the rough opening width and height at the framing stage, confirm the wall cavity is deep enough for the door thickness, and always measure after any flooring has been installed so the finished floor height is accounted for.

Steps to measure correctly

1. Confirm your rough opening against the manufacturer's spec for your chosen door size,  don't rely on a generic doubling rule alone; use the published figure for that exact kit.
2. Measuring wall cavity depth the cavity needs to be at least the door's thickness plus clearance for the running gear typically a finished wall thickness of 130mm–150mm minimum, though this varies by system.
3. Account for finished floor height measure from the finished floor level, not the subfloor, and leave a small gap (commonly around 10mm–15mm) between the bottom of the door and the floor so it runs freely.
4. Check header space above the opening the track and header housing sit above the door height, so confirm there's enough ceiling clearance before committing to a taller door.

What Wall Type Do You Need for a Pocket Door?

Pocket doors are best suited to non-load-bearing stud walls, since the cavity needs to be built into the wall's structure; installing one in a load-bearing wall is possible but requires a structural engineer to specify the necessary support. 

A standard timber stud wall can usually accommodate a pocket door cavity, but the wall will end up noticeably thicker than a standard partition once the door, frame, track, and plasterboard lining are all accounted for plan for this early if you're altering a wall specifically to fit one.

If you're unsure whether a wall is load-bearing, get this confirmed before ordering a pocket door kit, since reinforcing a load-bearing wall to accept a cavity is a significant extra cost and won't always be practical.

What Size Pocket Door Do You Need for Each Room?

Recommended pocket door sizes vary by room based on typical traffic, privacy needs, and accessibility requirements — narrower doors suit closets and utility spaces, while bathrooms and bedrooms typically call for a wider leaf.