Bathroom Renovation Merton
Bathroom and wet-room refurbishment in Merton, tanked, plumbed and tiled by one team.
- Rated 4.9 from 31 reviews on MyBuilder
- London guide: £6,000 to £20,000+
- Free design visit, itemised quote
GS Renovation refurbishes bathrooms throughout Merton, from compact family bathrooms in Wimbledon terraces to en-suites in larger homes near Morden and Mitcham. We handle the waterproofing, drainage, tiling and heating so period-home bathrooms are dry, warm and built to last.
In Merton, 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 Merton: 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 Merton
Merton range: choose above
How the job runs
- Free design visit at your Merton 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.
Waterproofing and wet rooms in Merton
Proper tanking is the part of a bathroom you never see and cannot skip. In Merton's older terraces we fully waterproof the walls and floor before a single tile goes on, which matters most in wet rooms and walk-in showers where water is not contained by a tray. Done correctly, tanking protects the joists and the ceiling of the room below.
Drainage and ventilation take extra thought in a Victorian or Edwardian house, where the bathroom often sits in the rear closet wing with limited fall to the soil pipe. We set the pipework to run cleanly, fit extraction that clears moisture properly, and finish with tiling and underfloor heating so the room stays warm on a cold Wimbledon morning.
Housing in Merton
About 87,830 homes are listed for Merton, and the mix is 58% houses to 42% flats, with 36% built after 1945, 37% in 1919 to 1939 and 26% earlier. A terrace bathroom in Merton vents front, back or up, never into a party wall, and 43% of homes here are terraced.
En-suites for letting and Merton's HMO rules
Merton has removed permitted development rights across the whole borough for converting homes (Use Class C3) to small houses in multiple occupation. That matters for a bathroom project when the brief is an en-suite in every bedroom so a house can be let by the room. The plumbing is not the issue, the change of use is. In Merton that change needs planning permission before the rooms are let, so an owner planning to let rooms settles the planning position before the en-suites are designed around it.
The rules have tightened in stages. Merton's immediate Article 4 Direction for small HMOs in seven wards started on 17 November 2022, and a further direction in 13 wards, including Lower Morden, Wimbledon Park and Wimbledon Town, started on 24 March 2026. A family adding one en-suite and keeping the house as a single home is unaffected. For a landlord, extra bathrooms also mean more soil connections, fans and electrical circuits, each designed into the Merton house before first fix rather than added room by room.
Space-saving layouts for Merton period homes
Bathrooms in Merton terraces are frequently tight, carved out of a closet wing or a small return bedroom over the years. We plan layouts that make every centimetre count, using walk-in showers, wall-hung units and considered positioning of the basin and WC so the room feels larger than its footprint suggests without cramming fittings together.
For growing families in SW19 and SW20, adding an en-suite to the main bedroom is a popular way to ease the morning rush. We assess where the drainage and water supply can reach, then build a compact, fully tanked en-suite that suits the proportions of the period house rather than fighting against them.
- Floor strengthening before large-format tiles or stone
- Concealed cisterns, frames and wall-hung sanitaryware
- Freestanding and built-in bath installation
VOA Council Tax stock of properties, March 2025, for all 25 statistical areas in Merton. Counts rounded by the VOA.
The GS Renovation Difference in Merton
Merton homeowners choose GS Renovation because a lasting bathroom depends on the waterproofing and drainage beneath the tiles, not just the finish. We tank properly, sort ventilation in awkward period layouts, and complete the tiling, heating and plumbing in one coordinated job, 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…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave…
George was brilliant. Lovely bloke, very reasonably priced and a perfectionist to boot. He completed our small kitchen renovation with care and great…
FAQ
Frequently Asked Questions about Bathroom Renovation Merton
How much should bathroom renovation in Merton cost?
Expect bathroom renovation at a Merton address to cost £6,000 to £20,000 or more (indicative), with the property rather than the postcode deciding the figure. At the SW19 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 Merton Council building control fee are then itemised, so another Merton quotation can be compared line by line.
What electrical rules apply in a Merton bathroom?
Fittings are selected by zone, according to how close they are to water. In your Merton bathroom the area in and immediately around the bath or shower takes the most heavily protected fittings, and requirements relax with distance. Socket positions are restricted, supplementary bonding may be required, and the whole installation is protected by a residual current device. New circuits are notifiable under Part P and are certified by a registered electrician on completion.
Why is water pressure poor in a Merton bathroom?
Usually the type of system rather than the pipework. Many Merton houses still have a gravity fed cylinder with a tank in the loft, and the pressure at a shower depends on the height of that tank above it. A pump, an unvented cylinder or a combination boiler each solve it differently. The right answer depends on the incoming main and the demand, and it is established before the bathroom is designed.
Will the floor take a large bath in a Merton house?
It is checked rather than assumed, particularly for stone or a filled bath. A freestanding bath in your Merton house concentrates a considerable weight over a small area of a timber floor that was designed for ordinary domestic loading. Where the weight is significant the joists are checked and strengthened, or the bath is positioned over a wall below. Discovering the problem after installation is expensive.
What goes behind the tiles in a Merton bathroom?
A board suited to wet conditions rather than ordinary plasterboard. In a Merton bathroom the wall behind a shower is tiled onto a tile backer or a moisture resistant board, bedded and sealed so water cannot reach the structure behind. Standard plasterboard softens once water gets past the grout, and the tiles come away with it. The substrate is the part nobody sees and the part that fails.
Can a Merton bathroom be refitted without moving anything?
Yes, and it is considerably quicker and cheaper when the layout already works. Keeping the bath, basin and WC in their existing positions in a Merton bathroom means the drainage and most of the pipework stay put, and the job becomes strip out, waterproofing, tiling and fitting. Moving the WC in particular is what adds cost, because its waste needs fall and a short route to the stack.
Can a Merton house be fitted with en-suites and let room by room without planning permission?
Not as a small HMO. Merton has removed permitted development rights across the whole borough for converting homes (Use Class C3) to small houses in multiple occupation. Adding bathrooms is building work, but letting the house to separate households is a change of use, and that needs permission first. Apply before the en-suites go in, so the layout matches what is approved.
Is a house in Merton's Wimbledon Park ward covered by the newer HMO Article 4 direction?
Yes, if the address is inside that ward. Merton's immediate Article 4 Direction for small HMOs in 13 wards, including Lower Morden, Wimbledon Park and Wimbledon Town, started on 24 March 2026. An owner there who plans extra bathrooms in order to let rooms needs planning permission for the change of use. A house kept as one family home is unaffected, whatever the number of bathrooms.
Does a new en-suite in a Merton house need building control sign-off?
Usually, because a new en-suite brings new drainage, an extract fan to outside and any new electrical circuit. Merton building control issues a completion certificate at the end, and that certificate is the document a buyer's solicitor asks for later. File it with the electrician's certificate for the new circuits, so both are to hand when the house is sold or let.
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