A bathroom in St John's Wood is usually one of two jobs, and they barely resemble each other. In a villa it is often an en-suite being added or reworked inside a bedroom, where the constraint is drainage — how you get waste from a room that was never meant to have any to a stack that may be on the far side of the house. In a 1930s mansion block it is a replacement in a solid-floored flat with a shared stack, a porter, a lift, permitted working hours, and a lease that has an opinion about what you may move. Same trade, entirely different planning.
Villas: the en-suite that drainage decides
The single biggest determinant of whether a new en-suite in a NW8 house works well is fall. Waste runs downhill, and it needs a consistent gradient to a stack. If the bathroom sits close to existing drainage, this is straightforward and the room can be laid out for how you want to use it. If it does not, you have three options and each costs you something. Build up the floor to gain the fall — which raises the finished level and means a step, a reduced ceiling height below, and a door that may need altering. Route the waste further, through joists, which is possible but must be done with structural sense rather than by simply drilling where convenient. Or pump it, which frees the layout but adds a mechanical component that needs power, access for servicing and a tolerance for the noise it makes at three in the morning.
None of those is wrong. What is wrong is choosing the layout first and finding out afterwards. The right order is: establish where the drainage can go, then design the room. That is a survey conversation, not a showroom one, and it should happen before a single fitting is chosen.
Villa bathrooms bring two other recurring points. First, hot water. Adding a third or fourth bathroom to a house often outruns the cylinder and the main — a beautiful new shower fed by an exhausted system is a disappointment that tiling cannot fix, so the system gets assessed as part of the scope. Our St John's Wood plumbers look at that at survey stage rather than at commissioning. Second, timber floors move. Tile and stone do not. Bridging that gap is the job: an adequately stiff deck, correct decoupling where needed, and full tanking in the wet zones. Most cracked grout and lifted tiles in period houses trace back to a floor that was tiled without being made rigid enough first.
What raises and lowers the cost of a villa bathroom
Bathroom refurbishment starts from £2,800. Where a particular room lands above that is not arbitrary — it is driven by a short list of things, and you can influence most of them:
- Whether waste and supply move. Keeping the layout is the single largest saving available. Moving the WC is usually the expensive move, not the basin.
- The floor build-up. Underfloor heating, decoupling, levelling and stone all add depth and labour, and depth has knock-on effects on doors and thresholds.
- Material. Large-format porcelain, book-matched marble and mosaic are three different jobs in cutting, setting and time — the tile choice is a labour decision as much as an aesthetic one. See tiling for what each involves.
- Ventilation and electrics. Extraction routes and zone-compliant lighting and heating are not optional extras; where the duct can run affects the ceiling and sometimes the elevation.
- Whether anything structural or consented is involved. A stud wall moved is cheap. A wall that turns out to be doing work is not.
You will get a fixed itemised quote before work begins, and that is the figure that stands. What we will not do is quote a number for a room we have not understood — a price given before the drainage question is answered is a guess dressed up as a commitment.
Mansion blocks: the building sets the programme
In a 1930s block the bathroom itself may be modest. Everything around it is not. These flats typically have solid floors, which means burying pipework in a screed rather than lifting boards, and it means noise transmits — a hammer on a solid floor is heard several flats away, not just below. They have a communal soil stack, which your waste joins, and the position of that stack is effectively fixed. And they have a porter, a lift and a set of rules.
Practically, that produces a job that is planned around the building:
- Booking in. Contractors are normally logged with the porter, and blocks commonly restrict hours — often weekday daytimes, with noisy work in a narrower window. Confirm the block's actual rules before dates are promised.
- Lift protection. The strip-out goes down in it and every tile, board and bag of adhesive comes up in it. Protection of the lift, corridor and any shared threshold is usually a condition of access, and we treat it as part of the job rather than an afterthought.
- Waste removal. A bathroom strip-out is heavy and communal bins are not for it. It leaves the building in a controlled way, and NW8's kerbside loading needs to be planned, not chanced.
- Water isolation. Where the isolation sits in a riser cupboard serving several flats, going off means giving notice through the porter or agent.
- Neighbours. The people either side of a solid wall are living with the work. Telling them what is happening and when quiet resumes costs nothing and prevents most complaints.
Consent — get this settled before ordering
In most leases, altering a bathroom is not automatically within your gift. Moving soil or waste connections, altering anything tied into shared services, changing floor finishes, or any structural change typically requires freeholder or managing-agent consent, often a formal licence to alter. Some leases also carry acoustic requirements for floor build-ups. The requirements vary considerably from lease to lease, and freeholds in this area sit with a range of owners including large estates whose processes differ — so the only reliable source is your own lease and your managing agent, not a general rule.
Two further points apply to blocks. Where a building is listed, listed building consent is typically needed for works affecting its special character, and St John's Wood's conservation area designation adds planning control over external changes — which reaches bathrooms whenever a new extract terminal or vent is proposed on an elevation. And if the freeholder proposes works affecting leaseholders more broadly, Section 20 of the Landlord and Tenant Act 1985 sets consultation requirements for qualifying works above £250 per leaseholder — relevant if your bathroom problem turns out to be the building's stack rather than your flat. Confirm any of this with your managing agent or the council before you commit.
How the job is sequenced
The order is not negotiable, because each stage buries the one before it. Survey and design, resolving drainage and services first. Fixed quote. Consent and access arranged — porter, hours, lift, isolation, and licence to alter if the lease requires it. Materials confirmed and on site, because a bathroom that stops for a missing tile stops entirely. Then: protection and strip-out; first-fix plumbing and electrics with everything set out and tested before it disappears; substrate, levelling and any underfloor heating; tanking to the wet zones and a proper set; tiling; second fix; commissioning; and certification for the electrical work, which falls under Part P with installations to BS 7671. Bathrooms also engage Part F for ventilation and Part G for sanitation and hot water, and those are checked at design rather than discovered at handover.
The stage worth resisting pressure on is tanking. It is invisible, it adds days, and it is the only thing standing between a leak and the flat below. In a block, a bathroom failure is not your problem alone — it is the ceiling of the person downstairs, and it is the fastest way to a claim.
What to have ready
Photos of the existing room and, if you can, of the cupboard where the pipes go. Your lease if it is a flat. The porter's or managing agent's contact and any contractor rules they issue. A rough idea of what you want to keep — sometimes the honest answer is that the layout is already the best one the drainage allows. Send that on WhatsApp and we can be specific quickly.
A bathroom rarely arrives alone. If it is part of a wider project, see refurbishment in St John's Wood. Broader detail on our approach is on the bathroom refurbishment page, other NW8 work on the St John's Wood area page, and certified electrics via our NW8 electricians.
In short
From £2,800, published and set. A fixed itemised quote before anything is touched. One point of contact who deals with the porter, the agent and the neighbours. And a room that is watertight where it matters, not just where it shows. Tell us about the room and we will tell you what it actually involves.