Downstairs Cloakroom Planning Checklist

Walk the ground floor and note every leftover space that is currently doing very little, including under the stairs and the blind end of a hallway.

Listing candidates before falling in love with one keeps the conversation open, and the obvious spot is not always the workable one.

Note what each candidate space currently holds, such as coats, shoes, the vacuum cleaner or a meter, and write down where those things would move to.

Under-stair storage absorbs an enormous amount of household clutter, and nobody misses it until it is gone.

Consider whether the new door would open into a route people already use to pass one another, and note how often that happens.

A hallway that works at present can become a bottleneck once a door swings into it at an awkward point.

Write down whether the chosen position would make the hall feel noticeably narrower, and check whether the household accepts that.

A hall is the first impression of the home, and losing width there is a trade some households regret more than others.

Note roughly how far each candidate position sits from the nearest existing drainage, and mark both on a rough plan of the ground floor.

Proximity to drainage often decides which of several possible positions is straightforward and which is difficult.

Nearness to a stack does not mean a connection can be made; ask a qualified plumber which of your candidate positions actually works.

Ask a qualified professional what forming a new partition or opening in this position would involve, and what they need to establish first.

The answer shapes both the disruption and the sequence, and it is not something an owner can determine by looking.

What a new partition could be built against, and what an opening would cut into, is for a qualified professional to establish on site.

Stand in the proposed space and note where the ceiling or stair soffit meets your head, recording where you can and cannot stand upright.

A plan shows floor area only, and the sloping underside of a stair removes far more usable volume than most people expect.

Check whether standing headroom exists over the position where the pan would actually sit, rather than only at the doorway.

The doorway is usually the tallest point, so headroom measured there flatters the space considerably.

What headroom is expected over a toilet varies by location; put that question to a qualified professional rather than deciding it by eye.

Consider whether you could close the door while standing inside, which is the honest test of whether an under-stair space is usable.

If the door can only be closed from a crouch, the room will be used reluctantly however good it looks on paper.

Write down where the stair string, a landing underside or a structural upright cuts across the space, and photograph each from the floor.

These are the obstructions a designer cannot see remotely and the ones that dictate where fittings can go.

Ask a qualified professional whether anything within the under-stair enclosure is doing a job, and what altering it would involve.

Under-stair construction varies enormously between homes and cannot be judged from the cupboard side.

Ask a qualified professional to establish what any under-stair construction is doing before assuming it can be opened up.

Note whether a meter, consumer unit or stopcock currently sits in this space, and ask what enclosing or relocating it would involve.

These items usually need to remain reachable, and discovering them late can undo an otherwise settled plan.

Relocating meters or electrical equipment is a matter for the relevant supplier and a qualified professional.

Walk outside and note where the soil stack, any gully and any access cover sit, then mark them relative to the proposed position.

Owners can gather this evidence quickly, and it lets a plumber give a far more useful first answer.

Put each candidate position to a qualified plumber in turn, and ask which of them the existing drainage could realistically serve.

The answer often moves the room to a different candidate position, which is far better to learn early.

A drainage route on the ground floor is shaped by the relevant local requirements and by the site, and must be confirmed by a qualified professional.

Note whether you believe the ground floor is solid or suspended, and record plainly that you are unsure if that is the honest answer.

How the floor is built changes what running a waste pipe involves, and an admitted uncertainty is more useful than a guess.

Ask a qualified professional to establish how this floor is built before assuming pipework can be run within it.

Write down whether new pipework might have to cross a room that has recently been finished, and note which room that would be.

The route matters as much as the destination, and a recently completed room changes how acceptable a route feels.

Consider whether a pumped arrangement might be raised as an option, and ask what upkeep, noise and access it would bring with it.

Pumped options open up positions that gravity cannot reach, but they change what the room needs over its life.

Ask a qualified plumber whether any pumped arrangement is appropriate here and what it would require.

Note where a new external pipe would appear on the outside wall, and whether that face of the house is seen from the street or garden.

External pipework is decided late by installers and noticed permanently by owners, so it is worth raising early.

Write down which candidate positions touch an outside wall and which sit buried in the middle of the plan, because that shapes everything after it.

Whether the room can reach outside air directly is the fact that shapes every later ventilation conversation.

Raise with a qualified professional how a windowless toilet beside living space is expected to be ventilated, and what applies in your area.

Expectations vary by location and by how the room is used, so this belongs firmly in the question column.

What ventilation a room of this kind needs varies by location and is for a qualified professional to confirm, not for an owner to decide.

Consider where a duct could run if the room sits in the middle of the plan, and ask what spaces it would have to pass through.

A duct route across a ceiling or through a cupboard affects rooms that are not part of the project at all.

A duct that crosses other rooms or a ceiling void affects spaces outside the project, and a qualified professional has to confirm that route is available.

Note whether the door would open directly into a dining or living space, since air from the room travels that way first.

A cloakroom that opens onto a sitting area is judged far more harshly on air movement than one off a hallway.

Ask whether any fan would run on after use, and note which nearby rooms would hear it while people are sitting in them.

Fan noise close to living space is a common source of complaint once the room is in daily use.

Consider how a room with no window would dry out between uses, and note whether the intended floor finish suits a space that stays damp.

Small internal rooms hold moisture, which shows first at the floor edges and around the base of the pan.

Note which rooms share a wall with the proposed cloakroom, and consider honestly what would be audible from a sofa or a dining table.

This is the single most common regret with a downstairs toilet and the easiest thing to raise before a position is fixed.

Consider whether the door would be in view of where people sit, and whether someone leaving the room would step straight into a group.

Sightline from a seating area is a layout decision that is easy to change while it is still a sketch.

Write down whether the door would open inwards or outwards, and think through what that means for someone stepping out into a narrow hall.

An outward door in a tight hall can strike a passer-by, while an inward door consumes floor the room may not have.

Ask a qualified professional what can be done about sound through the partition and through the door itself, and when it must be decided.

Anything affecting sound usually has to be agreed before the partition is closed, which places it early in the sequence.

How much sound a partition beside a living room can hold back depends on how it is built, which a qualified professional must advise on.

Note whether a lock with a clear occupied indication is wanted, and consider how a visitor unfamiliar with the home would read it.

Visitors cannot tell whether a closed door means occupied or simply closed, which is an avoidable awkwardness.

Consider whether running water at the basin would be audible from the dining table, and record whether that genuinely matters to you.

Some households care a great deal about this and others not at all, so it is worth stating rather than assuming.

Note how small a basin you would genuinely accept, and test it by washing your hands over something of roughly similar size at home.

A basin that looks neat in a showroom can be unusable in practice, and the test takes only a moment.

Consider how much a very small basin would splash the wall behind and the floor in front, and note what finish would tolerate that.

Small basins tend to concentrate water at the edges, which is often why cloakroom walls and floors show wear sooner than expected.

Write down whether the tap would sit on the basin or on the wall, and ask a qualified professional what the wall behind would need in each case.

A wall-mounted tap frees the basin surface but changes what has to happen inside the wall before it is finished.

Ask a qualified plumber what a wall-mounted tap requires in this construction before choosing one on appearance.

Decide and record whether hot water is wanted here, then ask a qualified plumber what supplying it to this position would involve.

Some cloakrooms are served cold only, and the decision affects pipe runs, any local water heating and the tap chosen.

How hot water is provided to a remote position is a matter for a qualified plumber to assess in this home.

Note where the paper, a small bin and a hand towel would live in a room that has almost no wall left once the fittings are in.

These three items are omitted from nearly every cloakroom plan and then end up on the floor.

Consider whether a corner or projecting basin would obstruct the door swing or the space in front of the pan, and note where the pinch point falls.

In a room this size, two fittings competing for the same air is the usual reason a layout has to be redrawn.

Consider that visitors will use this room without knowing the home, and check whether the light switch would be findable from the doorway.

Switch position outside or inside the door is often decided by the installer, and a visitor is the person it fails.

Write down whether coats and bags would end up in this room, and whether a hook or a place to set something down is realistic here.

If the cloakroom replaces a coat cupboard, it inherits the coats whether or not the plan allowed for them.

Note whether the mirror position would suit a visitor as well as the household, since this is often where people check themselves before leaving.

Mirror position is usually set to suit whoever is fitting it, and a small adjustment now serves everyone better.

Consider whether the door would close and latch reliably, and note how a visitor would know from outside that the room is in use.

Doors in tight spaces are often hung against an uneven wall, and a door that will not latch undermines the whole room.

Write down what happens when somebody with a pushchair, luggage or shopping is in the hall while the cloakroom door opens.

The hall does two jobs at once in most homes, and adding a door to it changes both.

Note whether the room would double as somewhere to wash muddy hands or fill a bucket, and record that use if it is genuinely likely.

Secondary uses affect the basin size, the tap and the floor finish, and they are rarely mentioned until afterwards.