- Postcode districts
- SM1, SM5, SM6
- Nearby
- Sutton, Mitcham and Morden
- Guide price
- £7,500–£15,000
- Typical time on site
- 5–10 working days
- Water
- Very hard across most of Greater London
- Survey
- Free, at your home
What does a wet room cost in Carshalton?
For Carshalton, our guide range for a wet room is £7,500 to £15,000 including VAT. Prices in London run at about 25% above the national guide, mainly because of labour rates. The figure depends on the size of the room, whether anything moves, and the products you pick.
Compact
- Floor former and linear or centre drain
Signature
- Underfloor heating option
Large or luxury
- Full conversion of a larger room
Guide prices for Carshalton including VAT. Your itemised written quote after the free survey is the price that counts.
Working in Carshalton
In Carshalton we cover SM1, SM5 and SM6; we also cover Sutton, 1.9 miles away, and Mitcham.
In Carshalton, many bathrooms are in flats or converted houses, so we check lease consents, access and the floor below before we price. If your Carshalton home has a concrete ground floor, a downstairs wet room may need the screed cut out to set the drain. For a wet room in a Carshalton flat, the first step is the lease, because freeholder consent is often needed before any work starts.
Most of Greater London has very hard water. If your supply in Carshalton is the same, limescale on shower glass and heads is a real issue: easy-clean glass, rub-clean nozzles and a squeegee make a big difference. Hardness varies street by street, so check the figure for your postcode with your water supplier.
What the job includes
- A pre-formed floor former with a linear or centre drain, or a screed laid to fall
- A thermostatic shower valve, exposed or concealed, with heads to suit your water system
- A survey of the floor construction, the joist size and direction or the concrete slab, and the route to the soil stack
- A frameless glass screen fixed to the wall and floor
Decisions to make first
Underfloor heating
Electric underfloor heating under the tiles dries the floor quickly after a shower; it is typically £700 to £1,500 for a bathroom.
Former or screed
A pre-formed board gives a consistent fall and suits timber floors. A sand and cement screed suits concrete slabs and larger shower areas.
Rules that apply in England
In England, a new drain connection or changes at the soil stack can be building-regulations work under Part H, and new circuits or changes to the wiring in the room are notifiable under Part P. If the wet room is a newly formed bathroom, Approved Document F requires extract of 15 litres per second intermittent or 8 litres per second continuous.

