Bathroom Renovation Marylebone

GS Renovation renovates bathrooms and en-suites across Marylebone, from compact period flats to the larger townhouses of W1. We get the parts that matter right in a mansion block, proper waterproofing, sound drainage and ventilation, so the room performs for years without leaks reaching the flat below.

In Marylebone, 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 Marylebone: 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 Marylebone 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.

Waterproofing bathrooms above other flats

In a Marylebone block there is almost always a neighbour beneath you, which makes waterproofing the single most important part of any bathroom job. We fully tank wet areas before tiling, seal around trays and junctions correctly and test the work, because a failure in W1 does not just damage your floor, it can flood the leaseholder below and trigger a serious dispute with the freeholder.

Drainage and ventilation take extra planning in a purpose-built flat, where you cannot simply route a new soil pipe wherever you like. We work with the existing stacks and falls, add mechanical extraction to clear moisture from rooms that often have no openable window, and coordinate any noisy or communal-area works with the managing agent so the job respects the whole building.

Housing in Marylebone

Roughly 12,620 dwellings sit on the valuation list for Marylebone. 8% are houses and 92% flats, and by age 54% predate 1919, 16% are interwar and 29% post-war. Where most homes are flats, a bathroom in a flat in Marylebone sits over a neighbour's ceiling, so it is tanked before tiling and a moved WC needs the freeholder's licence.

Marylebone bathrooms moved by earlier owners and how to regularise them

With 92% of Marylebone homes being flats and 54% of homes built before 1919, the bathroom you are replacing may not be where the building was designed to have one. If a previous owner moved it without approval, Westminster accepts regularisation applications as well as full plans and building notice, and resolving it during the refit is simpler than during a sale. The surveyor needs to see the waste route, the ventilation and the floor, all of which are exposed anyway once the old suite and tiles come out.

For the new work, Westminster's District Surveyors publish a minor works charge for the fit out of a bathroom or kitchen in one property, on either route. A Marylebone bathroom that stays in the same room can often go on a building notice, because the layout does not change. The completion certificate then waits on the electrical certificate for any new shower, towel rail or underfloor heating circuit, and on a gas certificate if the boiler moves, so those certificates are part of the programme rather than an afterthought.

Wet rooms and en-suites in W1 homes

Space is at a premium in Marylebone flats, so we design layouts that make the most of every inch. A walk-in shower or a fully tanked wet room can turn an awkward corner into a usable en-suite, and slim fittings, recessed storage and clever tiling keep a small period bathroom feeling generous rather than cramped, without sacrificing comfort.

The details lift the finished room. Underfloor heating warms tiled floors and frees up wall space, considered lighting flatters the tiling, and we build in acoustic and waterproof detailing suited to a flat shared with neighbours. Notifiable electrical work in the bathroom is certified by a registered electrician under Part P, and we hand over the certificates your lease and any future sale will require.

• Full plumbing, drainage and waterproofing (tanking)
• Soil pipe and waste re-routing within the floor build-up
• Pressure and leak testing before any tiling starts

VOA Council Tax stock of properties, March 2025, for Marylebone & Park Lane and Bryanston & Dorset Square. Counts rounded by the VOA.

When comparing bathroom renovation in Marylebone with other work, it helps to read chimney breast removal in Marylebone, bathroom renovation across Westminster, bathroom fitting in London, our London bathroom renovation page and Bathroom Tile Ideas.

The GS Renovation Difference in Marylebone

In a Marylebone flat a bathroom that leaks is a problem for the whole block, so getting the waterproofing, drainage and certification right is non-negotiable. GS Renovation tanks properly, works with the building's existing stacks and management rules, and makes sure the regulated work is certified by a registered electrician or signed off by building control. Our founder's 30+ years on the tools mean a watertight, well-finished bathroom and no anxious neighbours below.

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.