Bathroom Renovation Harrow
Bathroom and wet-room refurbishment in Harrow, 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 Harrow, from compact family bathrooms in 1930s Pinner semis to en-suites in larger post-war and interwar homes near Stanmore. We handle waterproofing, drainage, tiling and heating so the finished room performs as well as it looks.
In Harrow, 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 Harrow: 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 Harrow
Harrow range: choose above
How the job runs
- Free design visit at your Harrow 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.
Wet rooms and walk-in showers in Harrow
Wet rooms and walk-in showers are increasingly popular in Harrow, and both depend on getting the waterproofing right first. We fully tank the floor and walls before any tile goes down, form the falls to the drain correctly, and check that ventilation clears moisture so the room stays sound for years rather than failing quietly behind the finishes.
In the interwar houses of HA5 and HA7, converting a dated bathroom into a level-access wet room often means reworking the drainage and building up the floor to achieve the required falls. We handle that groundwork alongside the tiling, glazing and heating. Underfloor heating under a large-format tiled floor turns a cold north-facing Harrow bathroom into a genuinely comfortable room to use.
Housing in Harrow
Count the homes in Harrow and you get about 96,870: 38% built since 1945, 52% between the wars and 10% before 1919, with flats at 38% and houses at 62%. A semi in Harrow can vent its bathroom through the flank, and 31% of homes here are semi-detached.
Moving a bathroom in a Harrow flat without trouble from below
In Harrow 38% of homes are flats, and a bathroom refit in a flat is judged by the people underneath as much as by you. A leak through the floor lands in someone else's ceiling. Before the layout changes, read the lease: it can restrict where bathrooms may sit, and moving one over a neighbour's bedroom can need the freeholder's licence. The waste has to reach the shared soil stack with a proper fall, and that distance fixes how far the shower or toilet can move.
A wet room in a flat needs more care than one in a house. The whole floor is tanked before tiling, with an upstand at the walls and a sealed connection at the drain, and a timber floor has to be stiff enough not to flex and split the membrane. Where the floor is built up to create the falls, check the door threshold and the headroom. Agree access with the flat below in case its ceiling has to be opened, and keep photographs of the membrane before tiling as the record of what was done.
Space-saving bathrooms in Harrow interwar homes
The original bathrooms in Harrow's 1930s semis are often small, so a clever layout matters more than square footage. We plan wall-hung sanitaryware, recessed niches and the right shower configuration to make a tight room feel generous, then finish it with tiling and lighting chosen to open the space up rather than close it in.
Where a Harrow homeowner wants an en-suite, we carve it from a bedroom or landing and route new drainage and ventilation to serve it properly. New circuits, and changes to circuits near the bath or shower, are notifiable under building regulations, and the registered electrician we appoint certifies that work under Part P as part of the job. From a single family bathroom to a full en-suite addition, one team handles the plumbing, tiling and finish.
- Soil pipe and waste re-routing within the floor build-up
- Walk-in showers and wet-room installation
- Freestanding and built-in bath installation
VOA Council Tax stock of properties, March 2025, for all 30 statistical areas in Harrow. Counts rounded by the VOA.
The GS Renovation Difference in Harrow
Harrow homeowners choose GS Renovation because a lasting bathroom is built on proper tanking, drainage and ventilation, not just tiles. We waterproof correctly, have the notifiable electrics certified under Part P by a registered electrician, and make small interwar bathrooms work with clever layouts and underfloor heating. Our founder's 30+ years on the tools means a watertight, comfortable room finished cleanly.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
George is a very hard working builder, and has done a fantastic job on replacing my Bathroom. His attention to detail was great and I wouldn't…
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
FAQ
Frequently Asked Questions about Bathroom Renovation Harrow
What drives the cost of bathroom renovation in a Harrow home?
Three things drive the cost of bathroom renovation in a Harrow home within £6,000 to £20,000 or more (indicative): how much structure is involved, access at the HA1 address, and making good afterwards. The biggest variable is usually hidden: a timber floor over the room below decides how the wet area is built. GS Renovation prices each of the three separately rather than averaging across Harrow.
Can you turn the small bathroom in my Harrow semi into a wet room?
Yes. The compact bathrooms in Harrow's interwar semis suit level-access wet rooms well. The key is full tanking, correct floor falls to the drain and good ventilation, which we complete before tiling. It often means reworking the drainage and building up the floor. New circuits and work near the bath or shower are notifiable under building regulations, and the registered electrician we appoint certifies that under Part P as part of the finished job.
How long does a Harrow bathroom refit take, and in what order?
Plan for 10 to 15 working days. After strip-out, pipes and cables are first fixed, the waste falls are set before any tray goes down, and walls around the shower are tanked before tiling. Fitting sanitaryware and electrics comes last. That order is fixed, so a missing tile delivery holds the whole Harrow job rather than just one day.
Can the floor of my Harrow semi take a cast iron or stone bath?
Check the joists first. A full stone or cast iron bath with water and a bather can weigh far more than an acrylic one, concentrated on four feet. Interwar joists that have been notched for pipes over the years may not cope, so they are inspected with the floor up and strengthened if needed. Spreader boards under the feet help.
Where does the bathroom extractor vent in a Harrow house?
Usually through an outside wall or up into the loft and out through the roof or soffit. Part F requires bathroom extraction ducted to outside, never into the roof space. A duct through a cold loft needs insulating so condensation does not run back to the fan. The route is fixed before ceilings are closed.
Can we add a second bathroom in the loft of our Harrow semi?
Yes, if its waste can reach the soil stack with a proper fall. In many 1930s semis the stack runs up the outside at the side or rear, and a loft bathroom close to it drains easily. Further away, the pipe run through the floor gets long and a pump may be needed. New circuits for it are notifiable under Part P.
Who tests the electrics in a new ground floor shower room extension in Harrow?
Ideally an electrician registered with a self-certification scheme. Where notifiable electrical work on an extension is not done by a scheme member, Harrow adds a separate charge for electrical inspection and testing. A shower room in an extension brings new circuits, a shower supply and fan wiring, all notifiable. Ask for the electrician's scheme membership in writing before first fix, and make sure the certificate names the extension, so the building control file can be closed without an extra visit.
Can new waste pipes run through the floor of a Harrow house built since 2000?
Only where the joist type allows it. 15% of homes in Harrow were built in 2000 or later, and a house that recent may have engineered joists, with a thin board or metal web between timber flanges, rather than solid timber. Those must not be notched or drilled outside the zones the manufacturer allows, so a new waste run for a moved shower cannot simply be cut across them. Lift a board to identify the joists before the layout is agreed.
Does adding en-suites to let rooms in a Harrow house need planning?
The en-suites themselves do not, but the use they create might. Harrow's immediate Article 4 Direction on small HMOs means any new small HMO created on or after 12 June 2026 requires planning permission. A family house refitted with an en-suite to each bedroom and let to between three and six unrelated sharers becomes a small HMO. Settle the planning position before the bathrooms are ordered, and size the extraction and drainage for every en-suite running at once.
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