Bathroom Renovation Carshalton

GS Renovation renovates bathrooms and en-suites across Carshalton, working with the tight plans of SM5's interwar semis and its older Victorian and Edwardian terraces. We handle waterproofing, drainage, tiling, underfloor heating and space-saving layouts, delivering wet rooms and family bathrooms that suit older homes and modern living alike.

In Carshalton, a full bathroom refit typically costs £6,000 to £20,000 or more (indicative London ranges, MyBuilder and Checkatrade, 2026). GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Carshalton: we carry the tanking, plumbing and tiling as one contract, with the electrics certified by a registered electrician.

How the job runs

1. Free design visit at your Carshalton home and an itemised quote.
2. Strip-out, then first-fix plumbing and electrics.
3. Tanking to the wet areas, then tiling.
4. Sanitaryware and second fix, with notifiable electrics certified by a registered electrician. Typically 10 to 15 working days on site.

Wet rooms and waterproofing in Carshalton homes

A wet room or walk-in shower only works if the waterproofing is right, and in Carshalton's older houses that matters even more over suspended timber floors. We fully tank the area, bonding a waterproof membrane across floor and walls before a single tile goes on, then form the falls needed to drain properly. This protects the structure below and prevents the slow leaks that plague poorly built showers in period homes.

Ventilation is the other half of the job. Older SM5 houses trap moisture, so we fit proper extraction and, where needed, improve airflow to keep the room dry and free of mould. Underfloor heating warms cold solid or timber floors and frees the walls of radiators, which helps in a compact period bathroom. Every element is planned so the finished room stays sound for years.

Housing in Carshalton

Carshalton has about 9,910 homes on the Council Tax list: 18% pre-1919, 44% interwar and 38% post-war, with flats making up 34% and houses 66%. 33% of homes here are semi-detached; a semi in Carshalton can vent its bathroom through the flank.

New bathrooms and cloakrooms in Carshalton homes

Refitting an existing Carshalton bathroom is not the same, in building control terms, as creating a new one. Sutton's building control fee for forming a new bathroom, shower room or cloakroom is a separate item, with a discount rate and a higher regularisation fee. That covers an en-suite carved out of a bedroom, a shower room in a former box room or a cloakroom under the stairs. The inspector looks at how the soil pipe reaches the drain, the extract fan and its duct, and the fall on every waste, so plan those before the room is framed.

34% of homes in Carshalton are flats, and a bathroom in a flat sits over someone else's ceiling. Tanking the whole floor rather than the shower area alone, bringing the soil pipe to the stack by the shortest route and adding sound insulation between the joists all protect the flat below. The lease may need the freeholder's consent for a new wet room or a moved toilet. In a Carshalton conversion flat the soil stack can be shared with other flats, so any connection to it is planned with the freeholder.

Space-saving en-suites in Carshalton homes

Bathrooms in Carshalton's semis and terraces are often the small room over the stairs, a former closet wing or a slice of a bedroom, so every centimetre counts. We plan layouts around the existing soil pipe and drainage runs, choosing wall-hung units, compact walk-in showers and clever storage to make a small room feel considered rather than cramped. Careful tiling and recessed niches add space without stealing floor area from an already tight footprint.

Adding an en-suite to a period bedroom usually means extending the drainage and boxing new pipework discreetly, all designed to fall correctly to the existing stack. New circuits and circuit changes near the bath or shower are notifiable under Part P, so the wiring for the extraction and any underfloor heating is certified by a registered electrician under Part P, or notified to building control. Across SM5 we make these small period spaces work hard, combining tidy plumbing with a finish that lasts.

• Concealed cisterns, frames and wall-hung sanitaryware
• Full plumbing, drainage and waterproofing (tanking)
• Ventilation and extraction ducted to outside

VOA Council Tax stock of properties, March 2025, for Carshalton Village, Carshalton on the Hill and Carshalton Beeches & Banstead Road. Counts rounded by the VOA.

For the wider picture around bathroom renovation in Carshalton, see chimney breast removal in Carshalton, bathroom renovation across Sutton, bathroom fitting in London, bathroom renovation across London and Small Bathroom Ideas.

Trusted Bathroom Renovation in Carshalton

Carshalton homeowners choose GS Renovation because a bathroom in an older house lives or dies on the parts you cannot see. Proper tanking, correct falls, sound drainage and real ventilation, all done right the first time. We plan space-saving layouts for tight SM5 plans, have the electrics certified by a registered electrician and finish to a high standard, backed by our founder's 30+ years on the tools.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.