Bathroom Renovation New Malden
Bathroom and wet-room refurbishment in New Malden, tanked, plumbed and tiled by one team.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £6,000 to £20,000+
- 10 to 15 working days on site
- Free design visit, itemised quote
GS Renovation renovates bathrooms across New Malden, where the interwar semis of KT3 often have a single family bathroom and awkward, dated layouts to work around. We deliver fully waterproofed bathrooms, wet rooms and en-suites, handling the drainage, tiling and finish from start to finish.
In New Malden, 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 New Malden: we carry the tanking, plumbing and tiling as one contract, with the electrics certified by a registered electrician.
Price guide
| Work | Indicative London range |
|---|---|
| Bathroom renovation, full refit | £6,000 to £20,000+ |
Indicative London ranges (MyBuilder and Checkatrade, 2026), not a quotation. Prices checked September 2026. Full breakdown: Bathroom Renovation Cost.
Quick estimate for New Malden
New Malden range: choose above
How the job runs
- Free design visit at your New Malden home and an itemised quote.
- Strip-out, then first-fix plumbing and electrics.
- Tanking to the wet areas, then tiling.
- Sanitaryware and second fix, with notifiable electrics certified by a registered electrician. Typically 10 to 15 working days on site.
Waterproofing and wet rooms in New Malden
A bathroom that lasts starts with what you cannot see. In New Malden's interwar homes we tank and waterproof the walls and floor properly before a single tile goes on, which matters on the timber upper floors typical of these 1930s semis. For walk-in showers and wet rooms we form the falls carefully so water drains where it should, then tile onto a fully sealed substrate.
Good drainage and ventilation finish the job. We upgrade waste runs where the original pipework is undersized and fit effective extraction to manage the moisture that older KT3 bathrooms struggle with. The result is a warm, dry room that protects the interwar structure around it rather than slowly damaging the joists and plaster over the years.
Housing in New Malden
For New Malden the Council Tax list gives about 7,070 homes; by type 31% flats and 69% houses, by age 34% post-war, 33% interwar and 33% older than 1919. Semi-detached houses make up 31% of homes here, and a semi in New Malden can vent its bathroom through the flank.
When a New Malden bathroom counts as new in Kingston's terms
Kingston's building control charges list the formation of a new bathroom or WC as its own item, with the same charge under full plans or building notice and a higher one for regularisation. The important word is new. Refitting an existing New Malden bathroom in the same room, with the same drainage, is not the formation of a new one. Adding an en-suite to a bedroom, a WC under the stairs or a shower room in a converted garage is, because each brings new drainage and ventilation for building control to check. Tell us early which you are planning, so the application goes in before first fix rather than after the tiles.
The house type then decides the drainage. In New Malden 27% of homes are terraced houses. In an older terrace the bathroom can sit at the back of the ground floor, in the rear addition, where it was added after the house was built. Moving it upstairs is likely to count as a new bathroom, and it needs a route for the soil pipe down to the drain. With no side passage, that means either a stack on the rear wall or a boxed run inside the house. Decide which before the layout is drawn, because the stack position fixes where the WC can go.
En-suites and space-saving layouts in KT3
The bedrooms in a New Malden semi often have room to carve out a compact en-suite, and we plan these tight spaces around the existing soil stack and joists so the drainage runs sensibly. Wall-hung basins and toilets, walk-in showers and clever storage make the most of the footprint, turning an unused corner of a 1930s bedroom into a genuinely usable second bathroom.
Underfloor heating suits these renovations well, freeing wall space and warming the tiled floors that can feel cold in an interwar house. The new circuit for a heated floor, and changes to circuits around the bath or shower, are notifiable under Part P, so a registered electrician certifies them. From layout to the final grout line, one KT3 team delivers a bathroom that works hard in a small space.
- Ventilation and extraction ducted to outside
- Complete bathroom design and planning
- Walk-in showers and wet-room installation
VOA Council Tax stock of properties, March 2025, for New Malden East and New Malden West. Counts rounded by the VOA.
Why Choose GS Renovation in New Malden
New Malden homeowners choose GS Renovation because we build bathrooms that stay dry and last. We tank and waterproof properly for the timber floors in KT3 semis, sort out drainage and ventilation, and have the notifiable electrics certified by a registered electrician. One team handles the plumbing, tiling, underfloor heating and finish, backed by our founder's 30+ years on the tools.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
George was a great find. The job required re-plastering the walls before fitting acrylic panels. He also re-plumbed the shower waste under the solid…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
FAQ
Frequently Asked Questions about Bathroom Renovation New Malden
Can you quote bathroom renovation for a KT3 property over the phone?
GS Renovation will not give a real quotation for bathroom renovation in New Malden over the phone, only the range, £6,000 to £20,000 or more (indicative). On 07472 424 226 we can explain what moves the cost and whether the job needs building regulations compliance for any new drainage, extraction or notifiable electrics, but the KT3 property has to be seen first. Builders who quote blind across Kingston upon Thames revise the figure once the floor or walls are opened.
Can you fit an en-suite in the bedroom of my New Malden semi?
Often yes. Bedrooms in New Malden's interwar semis usually have space for a compact en-suite, and we plan the layout around the existing soil stack and floor joists so the drainage runs cleanly. With full tanking, a walk-in shower, wall-hung fittings and certified electrics, we turn an unused corner of a 1930s KT3 bedroom into a practical second bathroom.
How long will my only New Malden bathroom be out of use?
Expect 10 to 15 working days for a full strip and refit. Interwar semis often have one bathroom upstairs, so plan where the family washes in that window, whether at a gym, with relatives or through an overnight toilet reconnection in the early days. The heaviest disruption falls at the start, during strip-out and first fix, before the room is closed up for tiling.
Will the floor in my New Malden bathroom take a cast iron or stone bath?
It needs checking first. A filled bath with someone in it puts a large load on a small area of timber, and 1930s floors were sized for lighter fittings. Lifting boards shows joist size, span and condition, and the engineer can specify extra joists or a spreader plate under the feet. Joists notched badly for old pipework are repaired before anything else goes down.
Where can the lights and sockets go in a New Malden bathroom?
Outside the zones around the bath and shower wherever possible. The zones set how close a fitting may sit to water and what protection it needs, so a shaver point sits well away and a light above the shower carries a suitable rating. New circuits, and changes to circuits around the bath or shower, are notifiable under Part P, so a registered electrician fits and certifies it before the room is handed over.
How is the extractor fan routed out of a New Malden bathroom?
By the shortest duct to outside, which Part F requires. An external wall lets it go straight through; a bathroom with no outside wall needs a duct across the loft to a tile vent or soffit, insulated so condensation cannot run back. The fan is wired from the lighting circuit or its own spur, and a humidity sensor keeps it running after a shower until the air clears.
When does Kingston need to see a new New Malden bathroom before it is closed in?
After validation Kingston sends a Service Plan listing the stages at which inspections must be booked. For a new bathroom or WC, look for any stage that needs pipework or ventilation visible, and programme the boxing in and tiling after it. Officers attend Monday to Friday, except public holidays, typically between 9.30am and 3pm, so a tiler booked for the next morning needs the visit to have happened the day before.
Can pipes for a new en-suite run through the floor of a New Malden house built after 2000?
Only where the joists allow. 9% of homes in New Malden were built in 2000 or later, and houses of that age can use engineered joists, which cannot be notched along the top like solid timber. Pipes pass through them only at the positions and sizes the maker permits. A shower tray waste and a WC pan outlet therefore need their routes checked against the joist layout before the en-suite is placed on the plan.
Can a new soil pipe run down the outside of a New Malden house in a conservation area?
Kingston's conservation area page says an external alteration needs the council's approval. A new soil stack on a wall facing the street is plainly one. On a rear wall the answer can differ, so ask the council before the bathroom layout depends on it. A boxed stack inside the house avoids the question but costs floor space, so the choice is best made at the drawing stage.
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