Single vs Double Pocket Doors: Which Opening Do You Need?

Choosing a pocket door is not only about whether it slides into the wall. You also need to decide how many leaves the opening should have. A single pocket door uses one leaf and one pocket. Double pocket doors use two leaves that meet in the middle and slide into pockets on opposite sides. Get that choice wrong and you either under-size a wide opening or spend wall space and money on a double system you did not need.

This guide compares the two options for UK homes, using the same measurements manufacturers ask for: door size, passage (clear opening) size and overall frame size.

How single and double systems differ

Single pocket doors

One door panel slides into a pocket on one side of the opening. It is the usual choice for bathrooms, ensuites, utilities, wardrobes, offices and standard room doorways. Manufacturer buyer guides point to singles wherever the priority is reclaiming swing space on a normal-width opening.

You only need clear wall on one side for the pocket — roughly the width of the door leaf, plus the frame. The overall frame is still much wider than the leaf alone, because the pocket has to contain the door when it is open. Our pocket door sizes guide and pocket door frame guide explain those three measurements in more detail.

Double pocket doors

Two door panels meet in the middle and each slides into its own pocket. Double systems suit wider openings between kitchen and dining, living and dining, bedroom and dressing room, or larger open-plan spaces. When both leaves are open you get a wide, uninterrupted passage that a single leaf cannot match without becoming very heavy or needing a different system such as telescopic.

You need clear wall on both sides of the opening. That is the main planning constraint. If one side holds a chimney breast, a run of kitchen units, a radiator or a stack of services, a double may not fit even if the clear opening you want looks right on paper.

Published size charts for common double kits show how quickly the overall frame grows. As an example from one widely used UK double kit range for a 100mm finished wall: two 762 × 1981mm leaves give a passage around 1474 × 1971mm and an overall frame around 3168 × 2061mm; two 914 × 1981mm leaves push the passage toward 1800mm and the overall frame toward 3700mm. Always check the chart for the exact kit and wall thickness you are buying — figures vary by brand and finish.

Which should you choose?

Use a single when:

• the clear opening you need is roughly a normal door width (or a modest bit wider)
• you only have pocket space on one side of the opening
• you want the simplest kit, hardware set and installation
• the doorway serves one room rather than joining two large spaces

Use a double when:

• you want a wide clear opening so two rooms can feel connected when the doors are open
• you have matching clear wall on both sides for two pockets
• a single leaf wide enough for the opening would be too heavy for a standard kit, or would look unbalanced
• you are dividing living and dining, kitchen and dining, or a bedroom and dressing room and want both leaves to park out of sight

If you need a wide opening but only have pocket space on one side, look at telescopic pocket doors instead of forcing a double. Telescopic systems stack two (or more) leaves into a single pocket so the clear opening can be wider without needing a second wall cavity.

For room-specific ideas, see pocket doors for living rooms, pocket doors for kitchens and pocket doors for walk-in wardrobes.

Wall space, thickness and services

Both singles and doubles need a stud pocket that matches the finished wall thickness. Common UK finished thicknesses are around 100mm, 115mm and 125mm depending on stud size and plasterboard. Match the kit to that finished thickness; our pocket door wall thickness guide walks through the sum.

Before you commit to a double:

• confirm both pocket walls are free of pipes, cables, switches and radiators
• check neither pocket sits in a load-bearing wall you cannot alter
• allow for the full overall frame width on the plan, not just the clear opening
• install at finished floor level, as most manufacturers specify, so the leaves do not drag once flooring is down

Nothing should sit in either pocket cavity. If only one side is clear, redesign the opening or choose a single or telescopic system. Our pocket door installation guide covers the typical sequence once the wall is ready.

Hardware, soft close and synchronised opening

A single door needs one set of flush pulls, an edge pull, and soft close if you want it. A double needs hardware on both leaves. Soft close is available on many single and double kits; some ranges offer bi-directional soft close that cushions opening as well as closing. See our soft-close pocket doors guide and pocket door hardware.

Some double systems offer a co-ordinator (sometimes called synchronised or linked opening): moving one leaf moves the other. That is useful on wide openings where you want both doors to open together. It is usually an accessory rather than standard, so check the kit sheet. Self-close options also exist on some ranges and typically need one mechanism per leaf on a double.

Locks are less common on room-divider doubles than on bathroom singles. If you do need privacy or a key lock on a sliding leaf, use a pocket-door lock set rather than a standard mortice latch — see our pocket door locks guide.

Cost, weight and glass

Doubles cost more than singles for the same brand and wall thickness: you are buying two pockets, two sets of hangers and usually two leaves. Weight limits apply per leaf. Published charts for popular UK kits commonly list maximum leaf weights in the region of 80–100kg for standard doubles (heavier options exist on request from some makers). Choose leaves that sit comfortably inside the kit rating, especially if you want solid-core timber or glass.

Glass doubles are popular where you want light between rooms while still being able to close off the space. Toughened or laminated safety glass is the normal route for internal glass doors; confirm the kit is rated for glass leaves and that the thickness and weight fit. Our glass pocket doors guide covers the main checks.

If the opening needs fire resistance, do not assume a standard double kit will do. Use a tested fire-rated system and follow FD30 pocket doors explained and FD30 door requirements. Browse fire doors when the doorway sits on an escape route or needs a rated set.

Single, double or something else?

A surface-mounted barn-style slider saves swing space without a pocket, but it needs clear wall face for the track and usually seals less well — see barn doors vs pocket doors. A bifold packs into a smaller plan depth but stacks in the opening rather than disappearing into the wall — see pocket door vs bifold door. For a flush, hinged look instead of a slider, compare pocket door vs concealed door.

Frequently asked questions

Do double pocket doors need wall space on both sides?

Yes. Each leaf needs its own pocket. If you only have clear wall on one side, choose a single or a telescopic system that stacks into one pocket.

Are double pocket doors harder to install?

The principles are the same as a single — stud pocket, frame at finished floor level, board, hang, adjust — but you are fitting two pockets and aligning two leaves so they meet cleanly. Allow more time and follow the kit drawings.

Can I convert a single opening to a double later?

Only if you rebuild the wall to take a second pocket and a wider overall frame. It is not a hardware swap. Plan the opening type before first fix if you can.

How wide can a double pocket door opening be?

It depends on the kit. Standard residential doubles often cover clear openings from roughly 1170mm up to around 2000mm; some ranges offer larger bespoke passage sizes. Check the manufacturer’s size chart for wall thickness and leaf weight limits.

Do I need soft close on both leaves?

It is strongly worth it on busy room dividers. Fit soft close (or bi-directional soft close where available) on each leaf so neither slams. Confirm accessory compatibility with your kit.

Choose the opening first, then the kit

Start with the clear opening you need and the wall space you actually have. If one pocket side is enough and the opening is a normal doorway, a single is usually the right answer. If you want a wide, connected feel between two rooms and both walls are clear, a double earns its keep. Browse our pocket door kits for single and double options, then measure both pocket walls before you order. If you are unsure which layout fits your plan, send the opening width and wall constraints and we will help you match a kit.