En-suite installation in Kingston upon Thames
New en-suites carved out of bedrooms, lofts and landings — drainage, ventilation and all.
Coombe's large houses take conventional en-suites without drama. The interesting Kingston case is the cottages: owners often want an en-suite in a two-bedroom cottage, and the honest survey answer matters — losing 2.5m² from a 10m² second bedroom downgrades the house. Where it does work is cottages already extended into the loft, where the dormer bedroom above the bathroom takes a compact shower room on a straight stack run. Riverside flats rarely allow new wet rooms outside the existing service zones; we check the lease before drawing anything.
The houses we see in Kingston upon Thames
Canbury and Fairfield are flat-fronted Victorian cottages — charming, small, and structurally quirky: out-of-square rooms, shallow joists, bathrooms added into what were bedrooms or extended into the yard. Norbiton and the Berrylands direction are 1930s semis with conventional upstairs bathrooms. The riverside is modern apartment stock from the 1980s to brand new, all leasehold, with communal risers and management processes. Coombe, to the east, is large detached houses with multi-bathroom renovations.
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 Kingston upon Thames
Two quick steps — we know these houses.
No account, no obligation. We only use this to prepare your quote.
En-suites in neighbouring towns
En-suites in Kingston upon Thames?
Guide range £4,500 – £8,000 excluding VAT, typically 2–3 weeks. Free survey, fixed written quote.