Bathroom Renovation Belgravia
Bathroom and wet-room refurbishment in Belgravia, 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 fits bathrooms and en-suites across Belgravia, working within the Georgian and Regency townhouses and mews properties of SW1. Fitting modern, watertight bathrooms into period homes takes real care, especially where a property is listed. We handle the waterproofing, drainage, tiling and finishes throughout.
In Belgravia, 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 Belgravia: 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 Belgravia
Belgravia range: choose above
How the job runs
- Free design visit at your Belgravia 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 Belgravia homes
Fitting a wet room or walk-in shower into a period Belgravia townhouse depends on getting the waterproofing right first. We tank the floor and walls properly before tiling, so water cannot reach the original timber floors and lath-and-plaster below. We form the falls, set the drainage and install proper ventilation to manage moisture in rooms that were never designed for modern showering.
Underfloor heating suits these often cool, high-ceilinged townhouses, adding comfort without wall-mounted radiators taking up limited space. We tile to a high standard and handle the plumbing, with notifiable electrical work certified by a registered electrician or notified to building control. On listed properties we plan the installation to protect historic fabric and confirm whether listed building consent applies before altering original features.
Housing in Belgravia
The Council Tax list puts the Knightsbridge, Belgravia & Hyde Park statistical area at about 6,020 homes, 71% flats against 29% houses; 67% went up before 1919, 9% between the wars and 23% after 1945. Since most homes here are flats, a bathroom in a flat in Belgravia sits over a neighbour's ceiling, so it is tanked before tiling and a moved WC needs the freeholder's licence.
Soil pipes, vents and the outside of a Belgravia house
A new bathroom on an upper floor of a Belgravia house needs a route out for waste and air, and the quickest route is often straight through a wall. In a Westminster conservation area planning permission is needed for some alterations that would not need it elsewhere. A new soil pipe, extract grille or vent terminal on a stucco front facing the street is the kind of change that can fall within that. Belgravia has been a conservation area since 1968. So the internal route is worked out first: into an existing stack, along a boxed run in a partition, or up to an outlet at roof level out of sight.
Because 71% of homes in Belgravia are flats, a new bathroom that is not on the lowest floor of its building is often above somebody else's ceiling. That sets the order of work. The waste connection is made and water tested, the tanking is flood tested before a tile goes on, and the ceiling below is checked at each stage with the neighbour's agreement. Westminster's schedule has a minor works category for the fit out of a bathroom in one property, so new drainage and ventilation are inspected and recorded against the flat, with the electrician's certificate for any shower circuit filed alongside.
En-suites and space-saving layouts in SW1
Belgravia townhouses often need extra bathrooms carved into existing bedrooms, landings or awkward corners, so we design en-suites and family bathrooms that make the most of tight or irregular spaces. We plan drainage runs carefully within the constraints of a multi-storey period house, working out how to connect new soil and waste pipes without disturbing the fabric more than necessary.
In smaller mews properties every centimetre counts, so we specify compact fittings and clever layouts that keep the room practical. From tanking and drainage to tiling, ventilation and underfloor heating, we deliver a bathroom that works reliably for years and suits the quality expected of a Belgravia home, all finished to a high standard by one team.
- Shower pumps and pressure improvements where flow is poor
- Ventilation and extraction ducted to outside
- Underfloor heating and heated towel rails
VOA Council Tax stock of properties, March 2025, for the Knightsbridge, Belgravia & Hyde Park statistical area, which also covers parts of Knightsbridge. Counts rounded by the VOA.
The GS Renovation Difference in Belgravia
Belgravia owners choose GS Renovation because fitting watertight, modern bathrooms into period and listed townhouses demands proper tanking, drainage and ventilation, not shortcuts. We protect original floors and fabric, get notifiable work certified or signed off by building control, and finish to a high standard. With our founder's 30+ years on the tools, your bathroom is built to last in a demanding home.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
Really great job done in our bathroom to replace the shower head in the bathtub, and install a shower screen and caddy. We are very happy with the…
George always kept to commitments and arrived on time. He offered helpful suggestions during his initial visit and promptly provided a reasonably…
FAQ
Frequently Asked Questions about Bathroom Renovation Belgravia
How much should bathroom renovation in Belgravia cost?
Expect bathroom renovation at a Belgravia address to cost £6,000 to £20,000 or more (indicative), with the property rather than the postcode deciding the figure. At the SW1 survey GS Renovation confirms the detail that matters most, because the route for an extract duct to outside decides how much ceiling comes down. Labour, materials and any Westminster City Council building control fee are then itemised, so another Westminster quotation can be compared line by line.
Can you fit an en-suite into my Belgravia townhouse without damaging period features?
Yes. We plan drainage and pipe runs to connect a new en-suite while disturbing original fabric as little as possible, and we tank the space fully to protect period floors below. Adding a bathroom does not need planning permission, though new circuits, and changes to circuits around the bath or shower, are notifiable under Part P. If your townhouse is listed, we confirm whether listed building consent applies before altering any historic feature.
How long does a Belgravia bathroom renovation take?
Plan on 10 to 15 working days. In a flat above another home the tanking and waste connections are tested before tiling starts, because a leak would land in the neighbour's ceiling. In a listed house, cornices and joinery in the room are protected or recorded first. Where there is no second bathroom, the toilet is reconnected each evening for as much of the job as possible.
Can the toilet be moved in my Belgravia flat?
Only if its waste can still reach the shared soil stack with enough fall. A toilet needs a large pipe that can travel only a short distance before it would have to drop below the floor. In a Belgravia flat the stack usually serves the homes above and below, and the lease normally requires freeholder consent to relocate a bathroom, so the stack is located before layouts are drawn.
Can the floor of my Belgravia bathroom take a heavy bath?
It may need strengthening first. Upper floors in period townhouses are timber joists, and over the years many have been notched for pipes. A filled stone or cast bath puts a lot of weight on a small area. We lift the boards, check the joists' size, span and condition, and add or strengthen joists where needed. Setting the bath across the joists spreads the load.
Where can a Belgravia bathroom fan vent to?
Outside, as Part F requires, but the direction matters. On a listed house or a stucco front, a new vent through the principal elevation may need consent and would look out of place, so the duct usually runs to the rear wall or up to the roof. That route, and any fire stopping where it passes through floors, is settled at first fix.
Does a new shower circuit in a Belgravia bathroom affect the completion certificate?
Yes. Westminster issues its completion certificate only once all fees due have been received and every relevant electrical and gas certificate has been supplied. An electric shower, a heated floor or a new fan circuit is certified by the registered electrician who installs it, and a gas boiler change for a larger hot water demand brings its own certificate. The bathroom is not signed off until those are in.
Is a new soil pipe on the rear wall of a Belgravia house a planning question?
It can be. Westminster has 56 conservation areas, and inside one some alterations need permission that would not elsewhere. For an unlisted house, a soil pipe on a rear wall that does not front a highway can still be permitted development. On a street elevation, on a listed house or on a building of flats it is a consent question. Where the pipe cannot run inside, its position is checked before first fix.
Can a Belgravia bathroom be registered with a building notice?
Sometimes. Westminster accepts a building notice only where the work leaves the layout unchanged and sits outside the Fire Safety Order (RRO). Refitting an existing bathroom in a Belgravia house fits that. Carving a new bathroom out of a bedroom in a flat, with new walls near the entrance hall, changes the layout. The building's common parts also come under the Order, so full plans is the route, still under the minor works category for a bathroom fit out.
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