Bathroom Renovation Harlesden
Bathroom and wet-room refurbishment in Harlesden, 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 refits bathrooms and en-suites throughout Harlesden, making the most of the often tight spaces in NW10's Victorian and Edwardian terraces. We handle the waterproofing, drainage, tiling, heating and every trade in between, delivering wet rooms, walk-in showers and family bathrooms that last.
In Harlesden, 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 Harlesden: 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 Harlesden
Harlesden range: choose above
How the job runs
- Free design visit at your Harlesden 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 bathrooms in Harlesden homes
In these older NW10 terraces, bathrooms often sit over the rear closet wing or in a converted return, on timber floors that move and older masonry that needs care. Getting the waterproofing right matters more than any finish. We fully tank wet areas and shower zones before tiling, so water is kept out of the structure and there are no leaks into the rooms below, whatever the layout of the house.
We upgrade the drainage and ventilation at the same time, because period bathrooms are prone to poor airflow and damp. New soil and waste runs are set to the right falls, and extraction is fitted to clear moisture properly. Underfloor heating can go under the tiles to warm the room and help it dry, a real benefit in the solid-floored areas of these Harlesden terraces.
Housing in Harlesden
On the valuation list Harlesden counts about 6,350 homes, 83% flats and 17% houses; 78% predate 1919, 4% are interwar and 18% post-war. Where most homes are flats, a bathroom in a flat in Harlesden sits over a neighbour's ceiling, so it is tanked before tiling and a moved WC needs the freeholder's licence.
Adding a bathroom in Harlesden: notices, flats and old floors
Creating a bathroom where there was none is building work in Brent, and the building notice names alterations to create a bathroom among the smaller residential projects it covers. After the notice is accepted, usually within 48 hours, the job can begin, with the inspector checking the drainage, the extract and any structure as it goes. A refit in the same room is different, but a second bathroom or a new en-suite in a Harlesden home is a new installation, which Brent's charges scheme prices as its own item.
In Harlesden 83% of homes are flats, so a new shower room is usually built over someone else's ceiling. The tray, the waste connection and the tanking are the leak risk, so we test the waterproofing before the tiler starts and tell the flat below when the first shower runs. In a building from before 1919, as 78% of Harlesden homes are, the joists under a new bathroom were probably sized for a bedroom. The structural engineer we appoint checks them before a stone basin or a cast iron bath is specified.
Space-saving en-suites for NW10 terraces
Space is the constant challenge in Harlesden bathrooms, whether it is a narrow main bathroom over the closet wing or a new en-suite carved out of a bedroom corner. We plan the layout carefully, choosing compact sanitaryware, walk-in showers and wall-hung units that free up floor area and light, so even a small room in an NW10 terrace feels open rather than cramped.
A walk-in shower or full wet room suits these homes well, removing the tray lip and making a small space feel larger, provided the tanking and drainage are done properly. We tile floors and walls, set out the lighting and finish to a high standard. New circuits and circuit changes near the bath or shower are notifiable under Part P and are certified by a registered electrician, and no planning permission is needed for an internal refit.
A listed building is the exception: work that affects its character, inside or out, including an extension or taking out a wall or chimney breast, needs listed building consent from Brent Council, and doing it without consent is a criminal offence.
- Grout, silicone and trim detailing at completion
- Soil pipe and waste re-routing within the floor build-up
- Tanking membranes and waterproof boards behind tiles
VOA Council Tax stock of properties, March 2025, for Harlesden. Counts rounded by the VOA.
Trusted Bathroom Renovation in Harlesden
Harlesden homeowners choose GS Renovation because bathrooms in period terraces live or die on the waterproofing and drainage beneath the tiles. We tank properly, sort the falls and ventilation, and finish to a high standard in the tight spaces of these NW10 homes. Our founder's 30+ years on the tools means the hidden work is done right, not just the surface.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
I am very happy to recommend George after he completed the work on my 2 bathrooms. He worked very hard to make sure everything was completed and even…
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 Harlesden
What is the going rate for bathroom renovation around Harlesden?
Three Brent builders will give three different numbers for bathroom renovation in Harlesden, usually because they have scoped three different jobs within £6,000 to £20,000 or more (indicative). GS Renovation prices the NW10 property after a survey and sets out labour, materials, approvals and making good in the order they happen: the waste run is fixed before the tray goes down.
Can you fit a wet room in a small Harlesden bathroom?
Yes. A walk-in wet room suits the tight bathrooms in these NW10 terraces, removing the tray lip so a small room feels larger. The key is proper tanking and correctly graded drainage, especially over the timber floors above the closet wing. We waterproof fully, set the falls, add ventilation and underfloor heating, and tile to finish. No planning permission is needed for an internal refit.
How long will a new bathroom take in my Harlesden flat?
Allow 10 to 15 working days. Because 83% of Harlesden's homes are flats, the room being refitted is very likely the only bathroom, so agree with the fitter when the toilet will be reconnected each evening after first fix. Tanking has to cure before tiles go on, and the flat below is protected by that stage, so it is the one part of the programme not worth compressing.
Can my Harlesden bathroom move into a bedroom?
Only once the freeholder agrees in writing, because a shower sitting over a neighbour's bedroom shifts the risk onto them. The vertical drainage pipe serving every storey of the building cannot be moved, so the new position must drain back to it with a fall. Extraction ducted outside under Part F and Part P certification for the electrics complete the checklist.
How are pipes run across a Harlesden bathroom floor without weakening the joists?
Within strict limits. Notches belong in the top edge near the ends of a joist, and holes are drilled through the middle of its depth away from the ends, both kept small relative to the timber. Old Victorian joists have often been hacked by earlier plumbers, so any heavily cut ones are strengthened with new timber alongside before the floor is boarded and tanked again.
Should the old lead or iron pipes in a Harlesden bathroom be replaced?
Yes, while the room is stripped. Buildings from before 1919, which are 78% of Harlesden's dwellings, can still hold lead supply pipes or corroded iron wastes behind boxing. Replacing them in copper or plastic during first fix costs nothing extra in disruption. Where lead continues beyond your flat into communal parts, raise it with the freeholder so the whole run is dealt with.
Does Brent need telling before an en-suite is added to a Harlesden house?
Yes, a new en-suite is building work. Brent's building notice covers alterations to create a bathroom. The inspector looks at the drainage connection, the extract fan ducted to outside and any change to the floor structure. If the en-suites are for letting rooms to sharers, the use matters too. Brent has an article 4 direction requiring planning permission for change of use from dwellings (C3) to small HMOs (C4), so check whether it covers your address.
What should the flat below know before a Harlesden bathroom above is refitted?
When the water goes off, which days the noisy strip-out falls on and who to call if a stain appears on their ceiling. In Harlesden 83% of homes are flats, so a failed waste or tray above is the leak that reaches a neighbour first. A flood test of the new tray before tiling, and an access panel to the trap afterwards, protect both flats. The freeholder's licence may also require notice to other leaseholders.
Can a Harlesden bathroom go through a building notice if the floor needs strengthening?
Usually. Brent's building notice covers alterations to create a bathroom and minor structural changes in residential use, so a few new joists or trimmers under a bath can go through the same notice. The structural engineer we appoint sizes them, and the inspector sees them before the floor is boarded. Larger structural work, such as a beam to open the bathroom into a bedroom, is better approved on drawings through a full plans application first.
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