House Extension Drawings in Kensington and Chelsea

Which postcode districts around Kensington and Chelsea do we cover for house extension work?

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

Which Kensington and Chelsea neighbourhoods suit a house extension best?

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

• North Kensington (W10) — Victorian terraces, post-war estates defines North Kensington, where victorian terraces, post-war estates set what a house extension can do. 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 across W10. Any North Kensington house extension is validated by RBKC Planning, with Golborne Road the usual North Kensington reference point on the site plan.
• Brompton (SW3) — Victorian stucco terraces, mansion blocks defines Brompton, where stucco terraces, edwardian mansion blocks set what a house extension can do. Edwardian plots here are wider across SW3. Any Brompton house extension is validated by RBKC Planning, with Brompton Cross the usual Brompton reference point on the site plan.
• Kensington (W8) — Georgian and Victorian stucco terraces defines Kensington, where stucco terraces, listed buildings set what a house extension can do. 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 across W8. Any Kensington house extension is validated by RBKC Planning, with Kensington Palace the usual Kensington reference point on the site plan.
• Chelsea (SW3, SW10) — a house 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 house extensions against its own Chelsea character guidance, and the location plan we draw for Chelsea references King's Road.
• Notting Hill (W11) — house 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 house 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 house 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 house extension can do. Edwardian plots here are wider across SW5. Any Earl's Court house extension is validated by RBKC Planning, with Earl's Court station the usual Earl's Court reference point on the site plan.

Does Kensington and Chelsea planning policy restrict a house extension?

Conservation areas covering Kensington and Chelsea: RBKC Planning runs 38, and Holland Park, Earls Court, Kensington are the ones Kensington and Chelsea owners meet most. A house extension inside a Kensington and Chelsea conservation area loses permitted development, so the Kensington and Chelsea submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Chelsea a house extension is judged on the street elevation first.

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 house 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.

Kensington and Chelsea below-ground policy: RBKC's basement policy (post-2015) limits to single-storey under 50% of garden area; double-storey basements effectively prohibited in residential streets. Any house extension in Kensington and Chelsea that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and RBKC Planning will want the SW3 ground and groundwater position set out.

The building fabric around Kensington and Chelsea: 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. A house extension in Kensington and Chelsea is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to RBKC Planning.

What happens if a Kensington and Chelsea property sits on a boundary?

• Westminster — cross the Kensington and Chelsea boundary and Westminster City Council takes the house extension instead, applying 56 conservation areas of its own around SW1. We re-price house extensions at the Kensington and Chelsea edge because Westminster policy and Kensington and Chelsea policy rarely align on house extension depth.
• Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Kensington and Chelsea, so a house 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 house 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 house extension instead, applying 22 conservation areas of its own around NW2. We re-price house extensions at the Kensington and Chelsea edge because Brent policy and Kensington and Chelsea policy rarely align on house extension depth.

Sources for this Kensington and Chelsea house 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.