Bathroom
renovation
in Regent's Park, NW1
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A bathroom in a listed Regent's Park house has to find its pipes and its air without cutting into the fabric the listing protects.
GOV.UK warns that a bathroom with new plumbing, or electrical changes near a bath or shower, may need building regulations approval.
We plan the bathroom from the soil stack and the extract route, and only then choose basins, baths and tiles to fit them.
Source: GOV.UK: Building regulations approval
Where a bathroom can go in a listed plan
Westminster may protect a listed building's plan form, room hierarchy and chimney breasts.
Camden would not normally approve losing historic parts or obscuring the original plan.
Camden also asks for original features to be kept, and replaced only when beyond repair.
We favour a former dressing room or a later partition for a new bathroom, so principal rooms keep their shape, cornice and fireplace.
Sources: Westminster City Plan 2019-2040 (2026, adopted January 2026), Camden Council: Listed buildings, Camden: Regent's Park Conservation Area Appraisal and Management Strategy (adopted 11 July 2011)
Extract fans and the outside wall
Where work is done in a bathroom, Approved Document F asks for existing fans to be kept or replaced and checked.
For a bathroom, the minimum intermittent extract rate is 15 litres a second.
Westminster's City Plan wants flues and other additions carefully designed, sited and screened.
Camden's appraisal says aerials and dishes should be hidden, never on the front elevation, which is the approach we take to grilles too.
We duct extract to the rear or into an existing flue where the freeholder agrees, rather than cutting a new grille into a stucco front.
Sources: Approved Document F, Volume 1: Dwellings (2021 edition), Westminster City Plan 2019-2040 (2026, adopted January 2026), Camden: Regent's Park Conservation Area Appraisal and Management Strategy (adopted 11 July 2011)
Waste pipes on the rear elevation
Camden's guidance keeps new pipework to side and rear elevations where possible, grouped in a discreet position.
In the mews, Camden's appraisal expects black painted cast iron rainwater and other pipes.
Rear elevations here are easily seen and count as much as the fronts.
We set out new soil and waste runs on the elevation drawing before the licence goes in, so their route is agreed rather than improvised.
Sources: Camden Council: Home Improvements, Camden Planning Guidance (January 2021), Camden: Regent's Park Conservation Area Appraisal and Management Strategy (adopted 11 July 2011)
Bathrooms in flats
A lease clause against cutting external walls stops new openings, even for pipes.
Underfloor heating through floors the landlord owns, into another flat, needs the landlord's permission.
A landlord may not lawfully charge a premium for non-structural alterations needing consent.
Wet floors in a flat are tanked wall to wall, with a test before tiling, because a leak here runs into a listed ceiling below.
Source: LEASE: Alterations and home improvements
Water, electrics and the bath itself
Anyone fitting a bath of more than 230 litres must give notice to the water company first.
Approved Document P treats new circuits and changes near a bath or shower as notifiable.
A cast iron bath on an upper floor is weighed against the joists before it is ordered, and the floor is strengthened from below if needed.
Sources: The Water Supply (Water Fittings) Regulations 1999, regulation 5, Approved Document P: Electrical safety, dwellings (2013 edition)
Shower rooms in mews houses
Many mews were built as stables and coach houses and are now homes in their own right.
In Gloucester Gate Mews the living rooms sit above the former coach houses.
A mews shower room usually goes on the upper floor, so we check the old stable floor for strength and fall before laying a tray.
Source: Camden: Regent's Park Conservation Area Appraisal and Management Strategy (adopted 11 July 2011)
Stone, tile and the floor beneath
Floorboards in these houses flex, so stone or tile is laid on a separating mat over new plywood screwed to the joists.
Marble and limestone are sealed before grouting, and the first set of tiles is laid dry to check the joint lines against the door and the window.
Fitting out on a terrace road
The Paving Commission forbids mixing cement, concrete or plaster on its footways and roads.
Noisy work with drills is limited to 10am to 2pm under its terms.
Tile cutting and mixing happen inside on a protected floor, and the old sanitaryware leaves in a covered van, never a skip on the pavement.
Source: Crown Estate Paving Commission: Standard Licence Terms and Conditions
What listed building consent covers in a bathroom
Camden's Hampstead guide, which sets out its advice on listed houses, says swapping bathroom fittings would not normally need listed building consent, but new fixings, service pipes, flues or vents would.
Like-for-like repairs need no consent, while repairs in different materials, removing original parts or changing internal layouts do.
Listed building consent is separate from planning permission.
We list every new hole, pipe and fixing on a marked-up plan, so the consent application describes the bathroom exactly as it will be built.
Sources: Camden: Hampstead Conservation Area Design Guide (updated June 2026), Camden Council: Listed buildings
Air movement through the home
If the original room had no ventilation, Approved Document F does not require new ventilation, unless the work would make things worse than before.
Internal doors should leave a gap equal to a 10mm undercut on a 760mm door so air can move.
Old panelled doors are not cut down; we find the air path above the door or through a discreet grille in a later partition instead.
Source: Approved Document F, Volume 1: Dwellings (2021 edition)
Licences for a small job
Even a short bathroom job may need the Commission's permission to park a trade vehicle or a skip on the estate.
The start date must be at least seven days after the licence application.
Working without a permit, or outside its conditions, can lead to being ordered off the estate.
We apply for the permits in our own name as soon as the start date is agreed, and keep copies on site.
Sources: Crown Estate Paving Commission: information for contractors, Crown Estate Paving Commission: works licences
Questions about bathroom renovation in Regent's Park
Does a bathroom need building regulations approval?
It may, where new plumbing or electrics near the bath or shower are involved.
Can a soil pipe run down the front?
Camden's guidance keeps new pipework to side and rear elevations where possible.
How strong must the extract fan be?
At least 15 litres a second for intermittent extract in a bathroom.
Can my landlord charge for consent to a new bathroom?
Not for non-structural alterations, according to LEASE.
Can tiles be cut on the pavement outside?
No. The Paving Commission bans mixing and storage on its footways and roads.
How is a Regent's Park bathroom renovation priced?
The listing does much of the pricing. A bathroom in a listed Regent's Park house has to find its pipes and its air without cutting into protected fabric, which can mean longer service runs, careful floor work and consent before anything starts. The terms of the lease may add requirements of their own. Fittings and finishes are chosen last. We inspect the room, agree a scope and specification with you, and price the work in a written quotation.
Sources: GOV.UK: Building regulations approval, Camden Council: Home Improvements, Camden Planning Guidance (January 2021), Approved Document F, Volume 1: Dwellings (2021 edition), LEASE: Alterations and home improvements, Crown Estate Paving Commission: Standard Licence Terms and Conditions
Related pages
Sources
- GOV.UK: Building regulations approval
- Westminster City Plan 2019-2040 (2026, adopted January 2026)
- Camden Council: Listed buildings
- Camden: Regent's Park Conservation Area Appraisal and Management Strategy (adopted 11 July 2011)
- Approved Document F, Volume 1: Dwellings (2021 edition)
- Camden Council: Home Improvements, Camden Planning Guidance (January 2021)
- LEASE: Alterations and home improvements
- The Water Supply (Water Fittings) Regulations 1999, regulation 5
- Approved Document P: Electrical safety, dwellings (2013 edition)
- Crown Estate Paving Commission: Standard Licence Terms and Conditions
- Camden: Hampstead Conservation Area Design Guide (updated June 2026)
- Crown Estate Paving Commission: information for contractors
- Crown Estate Paving Commission: works licences
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