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Bathroom door knob: privacy without trapping someone

Updated: October 2026

Someone has turned the snib, and the landing side has no slot you can open with a coin. A bathroom door knob should let you shut the door for privacy and still get in if a child cannot come out. The usual UK pattern is a thumb-turn inside and an emergency release outside. A key is the wrong tool for that room. Prices are on the [doorknob comparison](/hub/door-and-window-security/doorknob). How the set type sits in the wider order is on the [doorknob buying guide](/hub/door-and-window-security/doorknob/sub/doorknob-buying-guide). Peter F. used UK ironmongery pages and the amazon.co.uk listings, updated October 2026. A qualifying purchase can earn a commission at no extra cost to you.

Someone has turned the snib, and the landing side has no slot you can open with a coin. A bathroom door knob should let you shut the door for privacy and still get in if a child cannot come out.

Our top picks

Infinity Decor Infinity Victorian brass knobs, 52 mm

Best overall

Infinity Decor Infinity Victorian brass knobs, 52 mm
7.8/10about £16.95
View offer
CML Hardware CML keyed entry ball set

Rank 2

CML Hardware CML keyed entry ball set
8.0/10about £7.90
View offer
Yale Yale brass bathroom knob set

Rank 3

Yale Yale brass bathroom knob set
7.2/10about £14.89
View offer
On this page
  1. 1.Privacy is not a key
  2. 2.Two spindles
  3. 3.What the bathroom listing actually says
  4. 4.When a lever is the kinder choice

Privacy is not a key

A bathroom lock is a short bolt you can slide from inside, with a way to withdraw it from the landing. The turn is not the knob. The knob, or a lever, still only pulls the latch back. Suffolk Latch makes that split explicit. Some older rim bathroom locks have no outside release at all, which is how people get stuck. A keyed entrance knob closes that release off. You need the key, and the key is the thing a child locks in the room. i-space, writing for foster households, says a bathroom privacy lock should be openable from outside in an emergency. If a child uses the room, fit the release anyway.

Two spindles

The latch and the privacy bolt do not share a bar. On a typical UK bathroom mortice, the latch follower is 8 mm, which is what the knob turns, and the bolt is 5 mm, which is what the thumb-turn turns. A seller’s page for the Union 2226 sashlock states that split, and that the lock has no keys and is not for fire doors. The Union lock is not one of these listings. Denleigh puts the same sizes in a fitting note: 5 mm for the bathroom turn, 8 mm for the latch. Forcing the knob’s 8 mm bar into the turn hole damages both. If the old lock has no outside release, new knobs will not create one. The sequence for a like-for-like knob, and the point where a fire door stops the job, is on the how to fit a doorknob page.
Infinity Decor Infinity Victorian brass knobs, 52 mm

Testsieger

Infinity Decor Infinity Victorian brass knobs, 52 mm
7.8/10about £16.95
View offer

What the bathroom listing actually says

The Yale set is the listing titled as a bathroom knob set. It is polished brass, about £14.89, for interior timber doors 35–45 mm thick, with a stated backset of 60–70 mm and a 51 mm rose. The listing names a deadlock latch bolt. It does not describe an outside emergency release. Silence is not proof that a coin slot is missing, and it is not proof that one is included. You check the fitting in your hand before you rely on it for a child. If the only release is a snib on the inside, that is the older pattern that traps people. Infinity’s brass pairs say they can be used with a bathroom mortice lock. The lock is not in those boxes, and reviews describe springs strong enough that people could not open the door.

When a lever is the kinder choice

A round knob asks for a twist. On a bathroom that twist happens with wet hands, and the heavy-sprung brass pairs make it harder. A lever on the same latch works with a push, which is the example Approved Document M uses where that document applies. A private house is not automatically in that rule. The CML keyed ball set is the listing to refuse for this room. It is a light entry set with three keys and an ANSI Grade 3 line, at about £7.90. ANSI Grade 3 is not a UK Kitemark, and a key does not give you an emergency release. It can suit a shed or a storeroom. It should not lock a bathroom. Buy the privacy bolt with a landing-side release, then a knob or a lever the household can turn.

Common questions

Is a keyed knob the same as a bathroom set?
No. A keyed set needs the key on the outside. A bathroom set, in the usual trade pattern, uses a turn and a release and does not issue keys. The CML listing in this comparison is the keyed type. The Yale listing is the one titled for a bathroom.
Does the Yale bathroom knob set state an outside release?
It does not describe one. It names a bathroom knob set, a deadlock latch bolt, a 60–70 mm backset and doors 35–45 mm thick, at about £14.89. Check the box for a coin slot before you treat the set as an emergency release.
Can I use the Victorian brass knobs on a bathroom if I add a turn?
The Infinity bullets say the mortice pairs can be used with a bathroom mortice lock, and that lock is not included. You can add a separate turn and release. Reviews of those brass pairs describe a very strong spring, including a bathroom door people could not open, so a light action matters more here than the period look.
Are bathroom locks high security?
They are privacy bolts. They are not BS 3621, and they are not a substitute for the lock on a final exit. A seller of the Union bathroom sashlock also says that pattern is not for fire doors. Treat the bolt as a way to keep the door shut for a few minutes.
What about a public toilet or a workplace?
Handles4doors treats an outside release as required in public buildings and workplaces, and says a private house is not automatically under that rule. Where people are employed, follow the building’s ironmongery schedule and the fire strategy. A round knob is a weak choice on an accessible route.
What if the only release is a snib on the inside?
Then the landing side cannot open the bolt without force or a gap in the door. That is how older rim bathroom locks leave someone shut in. Add a turn-and-release with an outside slot, or change the lock, before you rely on the room for a child.

Related pages

Best doorknob

Doorknob

Mortice door knobs: latch, spindle, backset, spring

How to fit mortice door knobs onto a UK timber door

Mortice or rim door knobs: which pair the door takes

Sources

Public UK and manufacturer sources from the research digest, used for this page in October 2026. Prices, stars and review counts are the amazon.co.uk figures in this comparison. None of these knobs is treated as BS 3621, BS 8621 or Secured by Design.

  1. BSI, BS EN 1906:2012 (retrieved October 2026)
  2. HOPPE UK: BS EN 1906 (retrieved October 2026)
  3. Approved Document M, Volume 2 (retrieved October 2026)
  4. Approved Document Q, 2015 (retrieved October 2026)
  5. Guild of Architectural Ironmongers, accessibility guide (2021) (retrieved October 2026)
  6. Secured by Design: doors, front and back (retrieved October 2026)
  7. More Handles, tubular latch guide (retrieved October 2026)
  8. Suffolk Latch Company: door knobs with locks (retrieved October 2026)