Pocket Door Locks: How They Work and How to Choose One

A pocket door saves a surprising amount of floor space, but the moment it goes on a bathroom, WC or bedroom, someone asks the obvious question: can you lock it? You can. You just can’t use the same lock you’d fit to a hinged door, because a sliding door doesn’t close the same way.

This guide explains how pocket door locks work, the main types you’ll come across, and the measurements to check before you order one. If you’re still choosing handles in general, our guide on how to choose pocket door handles covers flush pulls and edge pulls in more detail.

Why a pocket door needs a special lock

On a normal hinged door, the lock or latch throws a straight bolt sideways into a keep in the frame. That works because the door swings closed against the frame, and the bolt stops it swinging back open.

A pocket door slides sideways along a track instead. If you fitted a straight bolt, the door could simply slide back along it, so the bolt wouldn’t hold anything. Pocket door specialist Suffolk Pocket Door Company explains it neatly: instead of a straight bolt, a pocket door lock uses a hook-shaped latch. When you lock the door, the hook reaches out and catches on the strike plate in the frame, pulling the door and frame together and stopping the door sliding open.

That hook (often called a hook bolt or claw bolt) is the heart of almost every pocket door lock.

The main types of pocket door lock

Privacy locks (turn and release)

This is the lock most homes need. It’s the pocket door equivalent of a bathroom thumb turn. A typical privacy set includes:

• a hook lock that sits inside the edge of the door
• a strike plate for the frame
• a flush handle with a small thumb turn on the inside face
• a flush handle with an emergency release on the outside face
• an edge pull, so you can draw the door out of the pocket when it’s fully open

The thumb turn goes on the inside of the room, so whoever is in the bathroom can lock it. The emergency release goes on the outside. As UK ironmonger G Johns & Sons describes on one of its sets, the outside release lets the door be unlocked in an emergency using a coin or screwdriver. That matters if a child locks themselves in, or if someone is taken ill.

Privacy locks are the right choice for bathrooms, ensuites, cloakrooms and WCs, and they’re a sensible option for bedrooms too. Our guide to pocket doors for bathrooms goes into privacy, ventilation and moisture in more depth.

Passage sets (no lock)

Not every pocket door needs to lock. For a kitchen, utility room, cupboard or living room, a passage set with plain flush pulls and an edge pull is usually all you need. It’s simpler to fit, costs less and gives a cleaner look.

Combined handle and lock sets

Some ranges combine the lock and pull into one rectangular flush handle, so the thumb turn and the finger recess sit in the same plate. These suit modern, minimal interiors, and they mean one larger cut-out in the door face rather than separate holes. Our pocket door hardware range includes LPD pocket door sets in matt black and satin chrome, including the Virgo range with a locking handle.

Hook locks sold on their own

Higher-end hook locks are sometimes sold as the lock case only. For example, Joseph Giles notes that its Yellowlock privacy sliding door hook lock is supplied without the privacy snib or emergency release, which need to be specified separately. If you go down this route, check that the turn, release and lock all work together, including the spindle size.

How to choose a pocket door lock

1. Decide whether the door really needs to lock

Start with the room. Bathrooms, ensuites and WCs need privacy. Bedrooms are a matter of preference. Most other rooms don’t need a lock at all, and leaving it off keeps the door face cleaner.

2. Check the door thickness

Every pocket door lock is designed for a range of door thicknesses, and this is the first thing to check. Ranges vary between products. One G Johns set, for example, suits doors between 35mm and 44mm thick. Joseph Giles gives a minimum door thickness of 44mm for its Yellowlock. Some M Marcus privacy sets are listed for 35mm to 52mm doors, while another set in the same brochure needs at least 44mm.

So don’t assume. Measure your door leaf, then check the lock’s stated range. This also matters when you choose your pocket door kit, because kits are usually sized by door thickness. Our pocket door sizes guide explains how door and frame sizes fit together.

3. Check the backset

The backset is the distance from the edge of the door to the centre of the turn and release. Common pocket door lock backsets include 40mm, 50mm and 60mm, depending on the product. A larger backset puts the handles further from the door edge, which can make them easier to reach when the door is closed.

The backset also decides where the handles sit when the door is fully open. On a pocket door, the door slides into the wall until only the edge is showing. If your kit has an adjustable stop, you can set the door to stop slightly short of fully disappearing, which keeps the edge pull within reach. Check where your flush handles will end up relative to the frame, so they don’t disappear into the pocket.

4. Check the cut-outs

Pocket door locks need routing into the door edge for the lock body and bores through or into the door face for the handles. The sizes are set by the manufacturer. One M Marcus set, for instance, calls for a 48mm bore. Another manufacturer’s data sheet specifies a 54mm hole for its flush pulls and a 25mm hole for the edge pull. Always follow the template supplied with your lock.

If you’re ordering a pre-finished door, it’s worth knowing your lock before the door is machined, so the cut-outs can be planned properly.

5. Think about fire doors

If your pocket door is part of a fire-rated assembly, such as an FD30 pocket door system, the lock is part of that assembly. Government guidance on Approved Document B says a fire doorset should be regarded as a complete installed assembly, with the door, the frame and any ironmongery considered together. In practice, that means only using locks and hardware that the fire door system has been tested or assessed with. Our guide to FD30 pocket doors explains how these systems work.

6. Match your finishes

Pocket door locks come in the same finishes as the rest of your ironmongery, so it’s easy to keep things consistent. Matt black and satin chrome are both popular. If the rest of the house has lever handles in a particular finish, pick the pocket door set to match.

Fitting tips

A pocket door lock isn’t difficult to fit, but it does need care, because mistakes in the door leaf are hard to hide.

• Fit the frame and door first. Hang the door and adjust it on the track so it runs smoothly and closes evenly against the frame before marking out the lock.
• Mark the strike plate accurately. The hook has to catch the strike plate cleanly. If the door doesn’t close in the same spot each time, the lock won’t engage reliably.
• Use the template. Mark every hole from the manufacturer’s template, not by eye.
• Check the stop. Make sure the door stops in the pocket with the edge pull still reachable.
• Test from both sides. Lock from the inside, then check the emergency release works from the outside before anyone relies on it.

If the lock stops engaging after a while, it’s usually because the door has dropped or drifted on the track, not a fault in the lock. Our guide to pocket door problems and fixes covers adjusting the hangers and stops.

Frequently asked questions

Can you lock a pocket door?

Yes. Pocket doors use a hook lock, which catches on a strike plate in the frame and pulls the door tight against it. Privacy versions have a thumb turn inside and an emergency release outside.

Can I use a normal bathroom lock on a pocket door?

No. A standard lock throws a straight bolt, which a sliding door can simply slide back past. You need a lock designed for sliding doors with a hook-shaped bolt.

How do you unlock a pocket door from the outside?

Privacy pocket door locks have an emergency release on the outside face. It’s usually turned with a coin or screwdriver to retract the hook.

What door thickness do pocket door locks suit?

It depends on the product. Ranges such as 35mm to 44mm and 35mm to 52mm are common, and some locks need a door at least 44mm thick. Always check the stated range against your door.

Can I add a lock to an existing pocket door?

Usually, yes, as long as the door is thick enough for the lock and there’s room for the strike plate in the frame. You’ll need to rout the door edge and bore the face, so follow the lock’s template carefully.

Find the right lock for your pocket door

Browse our pocket door handles and hardware, including flush pulls and locking sets, or see our full range of pocket door kits. Not sure which lock suits your door? Contact our team and we’ll help you choose.