Flat renovation
and refurbishment
in Chelsea, SW3
Architects, Engineers, Surveyors & Builders Under One Roof.
One Studio. One Contract. One Team.
Independent surveying by our sister practice, Hampstead Chartered Surveyors (RICS Firm No. 923064)No. 61 Cadogan Square, built in 1879, is described in the Hans Town statement as the earliest high-class apartment building erected in London. On the Cadogan estate it is the lease that sets what may change inside a flat, and some leases allow no alterations at all, so we read it before a layout is drawn.
The lease, Cadogan and the list entry
Cadogan says that what can be altered in a home on its estate depends on the lease, a lease may forbid alterations entirely, and where Cadogan has to consent to the proposals, the leaseholder applies to it for a Licence to Alter.
Other Chelsea leases deserve the same reading. The advice body LEASE warns that a landlord's permission might be needed for alterations whatever planning or building regulations approval is already in place, and that a clause insisting on carpeted floors could prevent wooden or laminate flooring even where other alterations are allowed.
Listing adds a third layer. RBKC treats the entire listed building as protected, interior features and later additions included, and the 2024 Local Plan says special interest goes beyond appearance to the fabric that survives, where rooms sit and how they rank, and the historic plan and floor levels. Unconsented work that affects that interest is a criminal offence, and RBKC says both the owner and whoever did the work are liable.
Sources: Cadogan: residential customer welcome, LEASE: alterations and home improvements, Royal Borough of Kensington and Chelsea: listed buildings explained, Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024)
Divided houses, five-storey blocks and converted garages
Flats in Chelsea run from single floors of divided terrace houses to purpose-built blocks of five storeys, the appraisal notes, and some garages have become homes, their vehicle openings replaced by a window and a matching brick panel.
In a divided house the railed basement area and the balconies above it belong to the whole building, so a flat refurbishment inside leaves them as they are.
Source: Royal Borough of Kensington and Chelsea: Chelsea Conservation Area Appraisal
Deliveries, notice and the pavement outside a Chelsea block
Before a site opens, RBKC's Code of Construction Practice places it in Category 1, 2 or 3 by its likely impact on the neighbourhood. Category 3 covers internal refurbishment and cosmetic external works, which the Code characterises as mainly decorative and generally non-structural, with the building envelope left intact.
Deliveries and collections can run from 9.30am until 4.30pm, Monday to Friday, or until 3pm if a school or similar traffic-sensitive use lies on the route, and the council issues no weekend or bank holiday parking suspensions unless a construction traffic management plan specifies an exception.
The Code keeps footways open, with 1.2 metres or more clear unless a closure has been agreed, and no plant, materials or skip may be placed on the highway without a licence.
Sources: Royal Borough of Kensington and Chelsea: Code of Construction Practice, Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019)
Windows, cooling and retrofit in a Chelsea flat
A mansion block or similar building in multiple ownership has none of the permitted development rights a dwellinghouse has, and the Local Plan 2024 warns that new windows in a flat may need planning permission where they would materially change how the building looks. If the building is listed, every window alteration, secondary glazing included, needs listed building consent.
Air conditioning is scrutinised. Even for one unit, the Local Plan asks the applicant to weigh the environmental impact and fully explore passive cooling and ventilation first, and Policy GB8 resists plant, air- and ground-source heat pumps included, where noise and vibration would unacceptably harm the amenity of the surroundings.
Retrofit work is tested against Policy GB1: in historic and listed buildings, and anywhere in a conservation area, it must not harm the special interest, the historic fabric or the area's character.
Sources: Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024), Royal Borough of Kensington and Chelsea: listed buildings explained
How a Chelsea flat refurbishment runs
Every Chelsea flat project starts with a feasibility visit: we survey the rooms, the floors and the risers, and go through the lease with you to see whether a Licence to Alter or listed building consent will be needed. Our in-house architects and designers then draw the layout, and our in-house structural engineers design any change to a wall or floor.
The drawings go to the landlord, and to the council where consent is needed, and you receive a written quotation for the agreed scope. Work begins once the approvals are in place, and the programme for design and for the work on site is agreed with you in writing first.
Chelsea flat refurbishment: questions
Does Cadogan have to approve my flat refurbishment?
That turns on the lease. Cadogan says its leases define what may be altered, and some rule alterations out; where its consent is required, the leaseholder applies for a Licence to Alter.
Does a Chelsea mansion flat have permitted development rights?
No. The 2024 Local Plan points out that, unlike dwellinghouses, buildings such as mansion blocks, often in multiple ownership, have no permitted development rights, and it notes that new windows in a flat can need planning permission where they would materially alter the building's appearance.
Is the inside of a listed Chelsea flat protected?
Yes. RBKC protects a listed building as a whole, inside included, and the smaller jobs it says need consent include removing or adding fireplaces, cornices and skirtings, taking up floorboards, recessed lights and new openings.
Can I install air conditioning in a Chelsea flat?
Possibly. The Local Plan 2024 expects passive cooling and ventilation to be fully explored before air conditioning, even a single unit, and resists plant whose noise and vibration would have an unacceptable impact on surrounding amenity; in a listed building the unit needs listed building consent as well.
How much does a flat refurbishment cost in Chelsea?
The figure for a Chelsea flat rests on the lease and the freeholder. The licence to alter, often through Cadogan, the floor construction between flats, access for deliveries and any listed fabric decide how much work can be done and in what order. A feasibility visit covers those points, we then agree the scope and specification together, and you receive a written quotation.
Sources: Cadogan: residential customer welcome, Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024), Royal Borough of Kensington and Chelsea: listed buildings explained
Flat refurbishment we have completed nearby
Selected Hampstead Renovations projects in matching period and estate buildings across Prime Central and North-West London:
Rooms and elevations typical of Chelsea
Design, joinery and the build, under one contract in Chelsea
The same team stays with the project from the first visit to handover. Our in-house architects, designers and structural engineers draw and specify the work. Master joiners make the fitted furniture. Building Regulations approval comes from the building control body appointed for the project. Independent surveying is a separate appointment: Hampstead Chartered Surveyors & Building Consultancy, our RICS-regulated sister practice, is a separate firm that a homeowner instructs directly. One JCT contract covers the building work. Electrical and gas work is carried out by appropriately registered engineers. Completed structural work carries a 12-month aftercare/defects period. Cover is £5M public liability, £10M employers' liability and contractors' all risks cover. Main office: 250 Finchley Road, Hampstead, London NW3 6DN. Central London client consultation address: 2 Eaton Gate, Belgravia, London SW1W 9BJ. Telephone 020 7101 3168.
Licence to alter · Independent surveying by our sister practice
What clients have said about the work
I would like to thank Ross and his team for their consistent commitment to quality and their unerring reliability.
We have worked with Ross and his company many times. They are extremely professional and hardworking individuals who can work under any circumstances. There was no variation to the works.
Verified Planning, Estate & Conservation Sources
- Cadogan: residential customer welcome
- LEASE: alterations and home improvements
- Royal Borough of Kensington and Chelsea: listed buildings explained
- Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024)
- Royal Borough of Kensington and Chelsea: Chelsea Conservation Area Appraisal
- Royal Borough of Kensington and Chelsea: Code of Construction Practice
- Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019)