En-suite installation in Wandsworth
New en-suites carved out of bedrooms, lofts and landings — drainage, ventilation and all.
Southfields' Edwardian houses are the en-suite opportunity in Wandsworth — big front bedrooms, alcoves that take a 2.5m² shower room, and joist runs that reach the stack at proper falls. In the Tonsleys, an en-suite in a two-bed cottage is usually a net loss and we say so; the exception is loft-converted cottages, where the dormer room takes a compact shower room stacked directly over the bathroom below. Earlsfield conversions need the freeholder's consent for any new wet area and a check that the shared stack has capacity — both before drawings.
The houses we see in Wandsworth
The Tonsleys are 1850s–1870s two-up-two-downs where the bathroom is nearly always in the back addition — small, single-skin walls, external stack, minimal floor void. Southfields' Edwardian grid has proper first-floor bathrooms and generous structure. Earlsfield is heavily converted to flats, where bathrooms sit on split supplies with sub-metering and shared stacks. The riverside developments are new-build leasehold with concierge processes and no-cut slabs.
What en-suites involves
Adding a new en-suite in south London costs £4,500–£8,000 excluding VAT and takes two to three weeks. The build itself is a small bathroom; what decides feasibility and price is drainage — how far the new room sits from the soil stack — and ventilation, since most en-suites are internal rooms with no window.
This is for you if
- The main bedroom is large enough to give up 2–3m² without feeling it
- A loft conversion needs its shower room finished or added
- One family bathroom is refereeing the whole household every morning
- A guest room that would let better — or list better — with its own shower
- There is a dressing room, deep cupboard or dead landing corner doing nothing
- You are pre-empting teenage years
What's included
- Feasibility first: drainage route, stack position and joist runs checked at survey
- Stud partition built, sound-insulated and boarded for tiling
- Waste runs with proper falls — or a correctly specified pump where gravity cannot
- Shower, basin and WC in a layout drawn to fit the space, not squeezed
- Ducted extraction to outside — non-negotiable in a windowless room
- Part P certification and building-control compliance for the drainage
The standard we work to
New drainage connections and internal-room ventilation fall under Building Regulations Parts H and F; electrics under Part P. Macerators sized and specified where gravity falls are impossible.
The full write-up — costs, timings and the questions people ask — is on our en-suite installation page. Prices and standards are the same in every town we cover.
| Guide range | £4,500 – £8,000 |
| Typical duration | 2–3 weeks |
| Compliance | New drainage connections and internal-room ventilation fall under Building Regulations Parts H and F |
Guide ranges for budgeting, excluding VAT. We confirm a fixed price after a free home survey — the price we agree is the price you pay.
En-suites in Wandsworth
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No account, no obligation. We only use this to prepare your quote.
En-suites in neighbouring towns
En-suites in Wandsworth?
Guide range £4,500 – £8,000 excluding VAT, typically 2–3 weeks. Free survey, fixed written quote.