Bathroom Renovation New Barnet

GS Renovation builds bathrooms across New Barnet, whether in an interwar semi, squeezed onto the back of a Victorian terrace over the kitchen, or carved out of a bedroom in a converted flat. The waterproofing, the drainage falls and the joists underneath decide whether it lasts, so that is where the work goes.

In New Barnet, 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 New Barnet: 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 New Barnet 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.

Bathrooms over the back addition in EN4

The bathroom in a New Barnet terrace is often a later addition sitting over the kitchen, on a suspended timber floor, with the soil stack fixed to the outside of the rear wall. That layout limits things. Moving the WC means a 110mm branch at a fall between 1 in 40 and 1 in 110 back to the stack, and there is only so far you can go before you need a new stack or a macerator, which we would rather avoid. We measure the run and the available depth before drawing a layout that cannot be built.

Under the floor is where bathrooms are quietly ruined. Pipes get run by notching joists deeply, in the middle of the span, which is exactly where the timber is working hardest. Notches belong near the bearings and stay shallow; holes go on the neutral axis. If the layout needs pipes across the joists in the wrong place, the answer is a different route or new timbers sized by an engineer. A bouncy bathroom floor is also the fastest way to crack a newly tiled floor.

Housing in New Barnet

For the New Barnet and Hadley Wood statistical areas the Council Tax list gives about 10,670 homes; by type 50% flats and 50% houses, by age 52% post-war, 32% interwar and 17% older than 1919. Post-war houses give the easiest bathroom refits here: regular joists, accessible stacks and cavity walls that take ducted extraction cleanly.

Internal bathrooms and shared risers in New Barnet flats

Half of New Barnet's homes are flats, and in a purpose-built block the bathroom is often internal, with no window. Extraction then runs into a duct or a shared shaft rather than straight out through a wall. Replacing the fan is not a free choice: a fan pushing into a shared shaft must suit that system, or it can drive smells and moisture into the flat above. The soil stack usually runs in a riser shared with the flats above and below, and its access panel has to stay reachable after tiling.

Post-war New Barnet houses bring a different find. With 52% of homes built after 1945, the soil stack in an older bathroom may be asbestos cement or cast iron rather than plastic. Asbestos cement is left undisturbed or removed under proper controls, never cut for a new branch, so a relocated WC can mean replacing the stack first. We identify the pipe at survey and treat it as part of the programme, not as a surprise on the day the old suite comes out.

Tanking, ventilation and flats across New Barnet

Tiles and grout are not waterproof. The wet zone gets a tanking membrane over a suitable board before a single tile goes on, the tray or the formed fall is checked to drain properly, and the junctions at the floor and the corners are taped rather than trusted to sealant. In a terrace the bathroom usually sits over a kitchen, so a slow leak shows up in someone's ceiling downstairs weeks later. Getting this right costs very little at the time and a great deal to put right afterwards.

In a converted flat the floor you are working on is your neighbour's ceiling, so the freeholder's licence to alter and the managing agent's requirements come first, and your buildings insurer will care about how the wet area was formed. Ventilation matters just as much: an extractor ducted properly to outside rather than into a void, with the run kept short. All the electrical work, from the shower circuit to the lighting and any underfloor heating, is certified by a registered electrician under Part P.

• Floor strengthening before large-format tiles or stone
• Bespoke vanity units and storage
• Concealed cisterns, frames and wall-hung sanitaryware

VOA Council Tax stock of properties, March 2025, for the New Barnet and Hadley Wood statistical areas, which also take in East Barnet and Hadley Wood. Counts rounded by the VOA.

If you are weighing up options for your New Barnet property, it is worth reading chimney breast removal in New Barnet, bathroom renovation across Barnet, bathroom fitting in London, bathroom renovation anywhere in London and Wet Room Guide.

Why New Barnet Homeowners Choose GS Renovation

New Barnet bathrooms fail at the parts nobody photographs: the tanking, the fall on the waste and the joists under the floor. GS Renovation builds those properly first and tiles afterwards, deals with the freeholder and managing agent where the property is a converted flat, and has the electrics certified by a registered electrician under Part P. Founder led, fully insured, with our founder's 30+ years of hands-on experience.

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.