Wrap-around extension in Kensington and Chelsea

Where in Kensington and Chelsea does a wrap around extension actually get determined?

Every Kensington and Chelsea postcode district we draw in, the stock that dominates it and the authority that validates a wrap around extension there. Kensington and Chelsea fees below are the statutory England rates for 2026, not wrap around extension estimates.

Which Kensington and Chelsea neighbourhoods suit a wrap around extension best?

Roof pitch, wall build-up and plot depth change every few Kensington and Chelsea streets, and each one changes what a wrap around extension can achieve at that address.

• Kensington (W8) — wrap around extension work in Kensington means stucco terraces, listed buildings. Kensington is Georgian and Victorian stucco terraces. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage throughout W8. RBKC Planning decides the Kensington application, and Kensington Palace anchors the Kensington location plan.
• Chelsea (SW3, SW10) — a wrap around extension in Chelsea starts from georgian and victorian terraces, listed buildings, and Chelsea reads as Georgian and Victorian terraces, riverside. Georgian rear elevations here are usually the listed or locally listed face of the building in SW3. RBKC Planning assesses Chelsea wrap around extensions against its own Chelsea character guidance, and the location plan we draw for Chelsea references King's Road.
• Notting Hill (W11) — wrap around extension work in Notting Hill means victorian stucco terraces. Notting Hill is stucco terraces, painted facades. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage throughout W11. RBKC Planning decides the Notting Hill application, and Portobello Road anchors the Notting Hill location plan.
• Holland Park (W11, W14) — a wrap around extension in Holland Park starts from victorian and edwardian villas, and Holland Park reads as Victorian villas around the park. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage in W11. RBKC Planning assesses Holland Park wrap around extensions against its own Holland Park character guidance, and the location plan we draw for Holland Park references Holland Park.
• Earl's Court (SW5) — Victorian stucco terraces, mansion blocks defines Earl's Court, where stucco terraces, edwardian mansion blocks set what a wrap around extension can do. Edwardian plots here are wider across SW5. Any Earl's Court wrap around extension is validated by RBKC Planning, with Earl's Court station the usual Earl's Court reference point on the site plan.
• South Kensington (SW7) — a wrap around extension in South Kensington starts from stucco terraces, mansion blocks, listed buildings, and South Kensington reads as Victorian and Edwardian stucco terraces. Ground-floor mansion-block flats can extend into a rear light well in SW7. RBKC Planning assesses South Kensington wrap around extensions against its own South Kensington character guidance, and the location plan we draw for South Kensington references V&A.
• Knightsbridge (SW1X, SW7) — wrap around extension work in Knightsbridge means regency and victorian terraces, mansion blocks. Knightsbridge is Regency and Victorian terraces, luxury. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage throughout SW1X. RBKC Planning decides the Knightsbridge application, and Harrods anchors the Knightsbridge location plan.

Does Kensington and Chelsea planning policy restrict a wrap around extension?

Kensington and Chelsea conservation designations: there are 38 across RBKC Planning, Holland Park, Earls Court, Kensington among them. Designation costs a Kensington and Chelsea owner the permitted-development route: a wrap around extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Chelsea is the Kensington and Chelsea designation that most often changes a wrap around extension design.

Kensington and Chelsea and Article 4: Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. A wrap around extension planned at a SW3 address is checked against that direction first; RBKC Planning publishes the Kensington and Chelsea extent, and the SW3 line rarely follows the Kensington and Chelsea boundary you would expect.

Digging below a Kensington and Chelsea property: RBKC's basement policy (post-2015) limits to single-storey under 50% of garden area; double-storey basements effectively prohibited in residential streets. Where a wrap around extension in Kensington and Chelsea involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a Kensington and Chelsea dig within 3 m of a neighbour, and RBKC Planning expects the SW3 ground conditions addressed in the application.

Kensington and Chelsea housing stock: Grand white stucco Regency and Victorian terraces; red-brick Queen Anne mansions in Kensington; Edwardian mansion blocks; almost no post-war housing stock. Internationally wealthy residents; extensive listed building coverage; heritage and streetscape prioritised in every decision. Read that before choosing a wrap around extension route in Kensington and Chelsea — construction, not postcode, sets what is achievable.

Which neighbouring authorities border Kensington and Chelsea?

• Westminster — the Westminster boundary runs against Kensington and Chelsea, so a wrap around extension a street from Kensington and Chelsea is decided by Westminster City Council instead. Westminster runs 56 conservation areas across SW1 and its neighbours, which is why wrap around extensions priced for Kensington and Chelsea are re-checked against Westminster policy whenever the Kensington and Chelsea address sits on that edge.
• Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Kensington and Chelsea, so a wrap around extension a street from Kensington and Chelsea is decided by Hammersmith & Fulham Council instead. Hammersmith and Fulham runs 45 conservation areas across W6 and its neighbours, which is why wrap around extensions priced for Kensington and Chelsea are re-checked against Hammersmith and Fulham policy whenever the Kensington and Chelsea address sits on that edge.
• Brent — cross the Kensington and Chelsea boundary and Brent Council takes the wrap around extension instead, applying 22 conservation areas of its own around NW2. We re-price wrap around extensions at the Kensington and Chelsea edge because Brent policy and Kensington and Chelsea policy rarely align on wrap around extension depth.

Sources for this Kensington and Chelsea wrap around extension page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.