Bathroom Renovation Westminster
Bathroom and wet-room refurbishment in Westminster, 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 Westminster, from Regency townhouses in Belgravia to period mansion flats in Marylebone and Pimlico. We handle full waterproofing, drainage, tiling and heating, fitting wet rooms, en-suites and space-saving layouts that work within the borough's tight period footprints.
In Westminster, 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 Westminster: 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 Westminster
Westminster range: choose above
How the job runs
- Free design visit at your Westminster 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 Westminster
A bathroom in a Westminster townhouse or mansion flat almost always sits above another room or another home, so waterproofing is where we start. We fully tank walls and floors before tiling, form falls correctly for walk-in showers and wet rooms, and make sure drainage and ventilation are properly designed to protect the period fabric below. Done right, this is what stops leaks reaching the flat downstairs.
For leasehold flats in NW8 and W9, sound insulation and building-management rules matter as much as the finish. We coordinate with the managing agent on access and working hours, and pay careful attention to acoustic detailing where a bathroom sits over a neighbour. Every notifiable electrical and plumbing change is carried out to building regulations and certified on completion, the electrics by a registered electrician.
Housing in Westminster
On the valuation list Westminster counts about 132,230 homes, 91% flats and 9% houses; 48% predate 1919, 10% are interwar and 40% post-war. Most homes here are flats, and a bathroom in a flat in Westminster sits over a neighbour's ceiling, so it is tanked before tiling and a moved WC needs the freeholder's licence.
Moving or refitting a bathroom in a Westminster flat
For a Westminster bathroom the building control route turns on whether the room moves. Refitting in the same position leaves the layout alone, and Westminster says a building notice can be used where the work does not affect the layout and is not affected by the Fire Safety Order (RRO). Turning part of a bedroom into an en suite, or moving the bathroom across the hall, alters the layout and points to full plans. Decide which it is before drawings start, because the answer changes how early work can begin.
Westminster's District Surveyors also publish a minor works charge for the fit out of a bathroom in one property, on either route. In a city where 91% of homes are flats, the application is usually the smaller hurdle. The bathroom sits over someone else's ceiling, so the extract duct, the waste branch and the fire stopping around new pipes through the floor are the parts we leave open for inspection before anything is boarded. Photographs of each go into the handover file for the managing agent.
Space-saving bathrooms in Westminster period homes
Period homes in Marylebone and Pimlico rarely offer generous bathrooms, so clever layout does the heavy lifting. We carve en-suites out of awkward corners, use wall-hung sanitaryware and recessed niches to free up floor space, and plan the room around the soil stack and joist runs of a Georgian or Victorian house rather than fighting them.
Underfloor heating, warm tiling and considered lighting turn a small period bathroom into a genuine luxury. In listed properties across SW1 and W1 we work sensitively with original features and protected fabric, reconfiguring services discreetly so the finished bathroom feels contemporary without stripping the character out of the house. Every trade, from tanking to tiling, is handled by our own team.
- Concealed cisterns, frames and wall-hung sanitaryware
- En-suite creation in bedrooms and loft rooms
- Tanking membranes and waterproof boards behind tiles
VOA Council Tax stock of properties, March 2025, for all 24 statistical areas in Westminster. Counts rounded by the VOA.
Trusted Bathroom Renovation in Westminster
Westminster homeowners choose GS Renovation because a bathroom above another flat leaves no margin for error. We tank and waterproof thoroughly, design drainage and ventilation properly, and have the electrics certified by a registered electrician. We fit luxury finishes into tight period footprints, respect leasehold and listed constraints, and back it all with 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 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 Westminster
Does the cost of bathroom renovation rise in a mansion-block or period-flat Westminster property?
Age affects the cost of bathroom renovation in Westminster less than people fear; the structural part is broadly similar, within £6,000 to £20,000 or more (indicative). What differs in mansion-block or period-flat housing is making good cornice, floors and plaster around the W1 works, priced as separate lines. The sequence also holds: any underfloor heating is laid and tested before the floor is tiled.
How do you stop leaks when renovating a bathroom in my Pimlico mansion flat?
In a Pimlico mansion flat your bathroom usually sits above another home, so we fully tank the walls and floor before any tiling, form correct falls to the drainage, and pressure-check the plumbing. We also coordinate with the managing agent on access and building rules. All notifiable work is completed to building regulations, with the electrics certified by a registered electrician, giving you a watertight, compliant bathroom.
How long will a bathroom renovation take in my Westminster home?
About 10 to 15 working days from strip-out. The order does not bend: supply and waste pipes are positioned, the floor former is laid to fall towards the drain, and waterproofing must set completely before tiling begins. In a mansion block, drilling and breaking out are confined to the building's permitted hours, which is often what stretches a job towards the upper end of that range.
Where does the extractor fan vent in an internal Westminster bathroom?
Outdoors, as Part F expects mechanical extraction ducted to outside. Bathrooms deep inside a mansion flat plan often have no external wall, so rigid duct travels above a lowered ceiling to the facade or into a riser built for extraction, and connecting to a shared riser usually needs the freeholder's agreement. Fan position, duct size and bulkhead are settled before first fix.
Can the floor in a Westminster townhouse take a heavy freestanding bath?
Not without checking. Filled and occupied, a cast-iron or stone bath concentrates its weight onto two or three joists, and two centuries of plumbers may have notched those joists deeply. The engineer can specify doubling or bolting new timbers beside the originals beneath the bath's feet. That strengthening is done at first fix with the boards up, before any waterproofing or tiling.
Can I add an en-suite to a bedroom in my Westminster townhouse?
Often, if the waste can reach a soil stack. The toilet is the limiting fixture: its pipe needs a steady fall, and running it between joists is easy while crossing them is not, so joist direction frequently decides which wall the toilet sits on. The new room also needs extraction ducted outside under Part F. In a listed house, new partitions may need consent first.
Can a Westminster bathroom refit go ahead on a building notice?
Yes, where the bathroom stays where it is. Westminster limits building notices to work that does not change the layout and is not affected by the Fire Safety Order (RRO). A refit in the same footprint can qualify. Moving the room, or taking space from a hall that forms part of the way out of the flat, points to full plans instead.
Does a bathroom in a Westminster block built since 2000 need different care?
It can. 15% of Westminster homes were built in 2000 or later, and in a newer block the bathroom may be a factory made pod or sit on a floor designed as one acoustic system. Breaking into either can change how sound and water move between flats. Ask the managing agent for the original specification before choosing a new layout, and keep the floor build up the same unless the engineer agrees otherwise.
Is the Westminster bathroom fit out charge the same on a building notice and full plans?
Yes. Westminster's schedule sets one minor works charge for the fit out of a bathroom or kitchen in one property, and it applies on either a building notice or a full plans application. That leaves the choice to the work itself: if the layout is unchanged, a notice is quicker to start; if the room moves, full plans gets the design checked first.
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