Knightsbridge SW1X · Houses, flats & bathrooms
Mansion blocks, stucco terraces, garden squares and mews
Plan the renovation of a Knightsbridge mansion flat, terrace house or mews house with our Hampstead team. Two councils share the neighbourhood: Westminster's Knightsbridge Conservation Area is bounded to the south and west by Kensington and Chelsea, whose Hans Town and Brompton conservation areas meet Brompton Road, so the first question for any address is which council's rules apply.
Serving Knightsbridge from our Hampstead studio · NW3 6DN
020 7101 3168
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01 Mansion flats and conversions
Most of Hans Town's buildings were built as single houses and are now flats, and on the Cadogan estate the lease decides what may be altered, with a Licence to Alter where Cadogan's consent is needed.
Sources: Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000), Cadogan: residential customer welcome
Plan a flat renovation02 Terraces, squares and mews
From Hans Town's red-brick 'Pont Street Dutch' to the classical stucco of Princes Gate and Rutland Gate, each house answers to its own council's rules on roofs, rear extensions and basements.
Sources: Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000), Westminster City Council: Knightsbridge conservation area mini guide, Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024)
Plan a house renovation03 Kitchens in flats and houses
A kitchen extract or flue needs a route the building allows: in Hans Town the statement says fanlights should never be used for services such as flues or air conditioning units.
Source: Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000)
Plan a kitchen renovation04 Bathrooms in blocks and houses
In a listed building in Kensington and Chelsea, recessed lighting, vents and removing floorboards are among the smaller changes that need listed building consent, while gov.uk exempts replacing baths, WCs, basins and sinks from building regulations approval.
Sources: Royal Borough of Kensington and Chelsea: listed buildings explained, GOV.UK: when you don't need building regulations approval
Plan a bathroom renovation05 Wardrobes and bookcases
Our joinery team designs and builds wardrobes, bookcases and panelled storage for Knightsbridge flats and houses.
See bespoke joineryThe buildings
On the Kensington and Chelsea side, Henry Holland named his development Hans Town after Sir Hans Sloane, whose daughter-heiress married into the Cadogan family. Its conservation area takes in Cadogan Square, Cadogan Place, Hans Street, Lennox Gardens, Sloane Street, Pont Street and Pavilion Road among others, and the proposals statement finds the Queen Anne Revival style most characteristic of the area, the style behind Osbert Lancaster's phrase 'Pont Street Dutch'. In Cadogan Square, Lord Cadogan had to approve each design, which ensured a consistent theme of substantial red brick elevations.
The statement records that most of these buildings, originally single houses, are now divided into flats; that the Knightsbridge part has substantial retail premises and residential mansion blocks built mainly between the 1890s and about 1910; and that No. 61 Cadogan Square, of 1879, is the earliest high-class apartment building erected in London.
Westminster's 2004 mini guide dates the eastern part of its Knightsbridge Conservation Area, around Trevor Square and Montpelier Square and Place, to the early 19th century and calls it important for small-scale houses set around leafy squares linked by short streets and pedestrian ways. The central part, developed in the mid-19th century, is large stucco houses detailed in a classical manner, including Princes Gate, Rutland Gate, Queens Gate and part of Ennismore Gardens, and every part has mews properties of a much smaller scale than their grander neighbours.
The Westminster conservation area was designated in February 1968 and extended in 1978 to take in the area north and west of Princes Gardens and around Rutland Gardens and Rutland Gate, and it contains over 275 listed buildings. Hans Town was first designated in 1971 and extended seven times between 1975 and 1995.
Sources: Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000), Westminster City Council: Knightsbridge conservation area mini guide
Rules that shape a project
Each council applies its own plan. RBKC adopted its Local Plan 2024 on 24 July 2024, superseding the Local Plan 2019, while Westminster's City Plan governs a city with 56 conservation areas covering 78% of its area and more than 11,000 listed buildings and structures.
Westminster's mini guide says its Knightsbridge Conservation Area is bounded to the south and west by Kensington and Chelsea. On that side, Hans Town's northern edge is the south side of Brompton Road and the Knightsbridge thoroughfare, and RBKC describes the Brompton Conservation Area, whose appraisal it adopted on 25 October 2016, as bounded by Brompton Road to the south and Montpelier Street to the east.
Sources: Westminster City Council: Knightsbridge conservation area mini guide, Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000), Royal Borough of Kensington and Chelsea: conservation area maps, Royal Borough of Kensington and Chelsea: conservation area appraisals
RBKC says a listed building is protected as a whole, including the inside, internal features and later extensions, and that works affecting its interest without consent are a criminal offence for which both the owner and the person who did them are liable. Westminster's City Plan Policy 44 aims to preserve special interest and protect original or significant detail and historic fabric.
Sources: Royal Borough of Kensington and Chelsea: listed buildings explained, Westminster City Plan 2019-2040 (2026, adopted January 2026)
Prince's Gardens is protected by the London Squares Act 1931, except a strip of 50 feet on its west side measured from the rear of Nos. 49 to 58 Prince's Gate. Cadogan Place and Hans Place are on English Heritage's Register of Parks and Gardens of Special Historic Interest.
Sources: Westminster City Council: Knightsbridge conservation area mini guide, Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000)
Westminster's mini guide says the Article 4 direction at Relton Mews covers all external alterations, and its Article 4 page lists numbers 1, 4, 8, 11, 12 and 13. RBKC's list includes Pont Street Mews under a direction starting 18 October 1988, and Westminster's city-wide basement direction has removed permitted development rights for basements since 31 July 2016.
Sources: Westminster City Council: Knightsbridge conservation area mini guide, Westminster City Council: Article 4 Directions in Westminster, Royal Borough of Kensington and Chelsea: Article 4 Directions in conservation areas
In Kensington and Chelsea, Local Plan 2024 Policy CD11 limits basements to a maximum of half of each garden, rules out excavation beneath a listed building, vaults included, and requires a pumped device against sewer flooding. Westminster's City Plan Policy 50 likewise supports a basement beneath at most half of the garden land, and treats no more than one storey, about 2.7m floor to ceiling, as the most appropriate form.
Sources: Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024), Westminster City Plan 2019-2040 (2026, adopted January 2026)
Cadogan says the terms of the lease define how a home on its estate can be altered, that in some cases a lease may prohibit alterations altogether, and that a Licence to Alter is needed where its consent is required. LEASE advises that, depending on the lease, a leaseholder might need the landlord's permission even with planning permission.
Sources: Cadogan: residential customer welcome, LEASE: alterations and home improvements
On site
The construction codes differ as much as the hours: RBKC sorts sites into categories and Westminster into levels, and both expect neighbours to hear about the work before it starts.
Westminster's permitted building day is 8am–6pm on weekdays and 8am–1pm on Saturdays. Demolition, excavation and piling need special permission to happen on a Saturday, and so does noisy work on a Sunday or bank holiday.
Source: Westminster City Council: noise problems we can investigate
RBKC permits work that can be heard beyond the site boundary 8am–6pm on weekdays, with demolition and concrete breaking confined to 9am–noon and 2pm–5.30pm. Noisy Saturday work was stopped by its construction code, and Sundays and bank holidays need the council's written permission in advance.
Sources: Royal Borough of Kensington and Chelsea: construction site enforcement, Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019)
Deliveries and collections in RBKC are limited to 9.30am–4.30pm on weekdays, and the council issues no parking suspensions at weekends unless a CTMP allows one. Westminster asks for 10 working days' notice to suspend a bay and adds a short-notice fee within 10 calendar days of the start. Both councils license scaffolding, hoardings and skips placed on the highway.
Sources: Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019), Westminster City Council: parking bay suspensions, Westminster City Council: Code of Construction Practice (May 2026)
Westminster classes a project that builds or extends a basement, and is not Level 1 or 2, as Level 3: a Construction Management Plan goes to the council 40 working days or more before the start.
Sources: Royal Borough of Kensington and Chelsea: Code of Construction Practice, Royal Borough of Kensington and Chelsea: Code of Construction Practice (April 2019), Westminster City Council: Code of Construction Practice (May 2026)
Questions before you begin
It depends on the street, so check the full address with the council. As a guide, Westminster's Knightsbridge Conservation Area is bounded to the south and west by Kensington and Chelsea, and the Royal Borough's Hans Town Conservation Area starts on the south side of Brompton Road and the Knightsbridge thoroughfare.
Sources: Westminster City Council: Knightsbridge conservation area mini guide, Royal Borough of Kensington and Chelsea: Hans Town Conservation Area Proposals Statement (adopted January 2000)
On the Westminster side, yes, from 8am to 1pm, though not for demolition, excavation or piling without special permission, and with lower noise thresholds than on weekdays. On the Kensington and Chelsea side, Saturday work loud enough to be heard beyond the site needs RBKC's written permission beforehand.
Sources: Westminster City Council: noise problems we can investigate, Westminster City Council: Code of Construction Practice (May 2026), Royal Borough of Kensington and Chelsea: construction site enforcement
If your home is on the Cadogan estate, the lease decides: Cadogan says its terms define what can be altered and may prohibit alterations altogether, and where Cadogan's consent is needed you apply for a Licence to Alter.
Source: Cadogan: residential customer welcome
Each council sets its own limits. In Westminster, an Article 4 direction removed permitted development rights for basements across the city from 31 July 2016, and City Plan Policy 50 supports schemes that extend beneath no more than 50% of the garden land. RBKC's Local Plan 2024 keeps a basement under less than half of the garden and usually to one storey, and Policy CD11 rules out digging beneath a listed building.
Sources: Westminster City Council: Article 4 Directions in Westminster, Westminster City Plan 2019-2040 (2026, adopted January 2026), Royal Borough of Kensington and Chelsea: Local Plan (adopted July 2024)
Every Knightsbridge project is priced on its own survey, because the address changes the job. Which council applies, Westminster or Kensington and Chelsea, sets the planning and construction rules; a Grosvenor or Cadogan estate consent adds its own drawings and supervision; a listed stucco house carries more repair and consent work than a later mansion flat; and access to the street governs how materials reach the building. After a feasibility visit we agree the scope and specification with you and give you a written quotation.
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
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Projects in Knightsbridge: Rutland Court, SW7, an apartment refurbishment in a Victorian mansion block, and Chevalier House, SW3, an apartment refurbishment.
