L-shaped dormer loft in Kensington and Chelsea

Which postcode districts around Kensington and Chelsea do we cover for l shaped dormer work?

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

How does a l shaped dormer differ street by street across Kensington and Chelsea?

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

• Earl's Court (SW5) — l shaped dormer work in Earl's Court means stucco terraces, edwardian mansion blocks. Earl's Court is Victorian stucco terraces, mansion blocks. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout SW5. RBKC Planning decides the Earl's Court application, and Earl's Court station anchors the Earl's Court location plan.
• South Kensington (SW7) — a l shaped dormer in South Kensington starts from stucco terraces, mansion blocks, listed buildings, and South Kensington reads as Victorian and Edwardian stucco terraces. Dormers on mansion blocks are a freeholder question before they are a planning one in SW7. RBKC Planning assesses South Kensington l shaped dormers against its own South Kensington character guidance, and the location plan we draw for South Kensington references V&A.
• Knightsbridge (SW1X, SW7) — a l shaped dormer in Knightsbridge starts from regency and victorian terraces, mansion blocks, and Knightsbridge reads as Regency and Victorian terraces, luxury. Full-width rear dormers on Victorian terraces here are the default in SW1X. RBKC Planning assesses Knightsbridge l shaped dormers against its own Knightsbridge character guidance, and the location plan we draw for Knightsbridge references Harrods.
• North Kensington (W10) — l shaped dormer work in North Kensington means victorian terraces, post-war estates. North Kensington is Victorian terraces, post-war estates. Full-width rear dormers on Victorian terraces here are the default throughout W10. RBKC Planning decides the North Kensington application, and Golborne Road anchors the North Kensington location plan.
• Brompton (SW3) — l shaped dormer work in Brompton means stucco terraces, edwardian mansion blocks. Brompton is Victorian stucco terraces, mansion blocks. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout SW3. RBKC Planning decides the Brompton application, and Brompton Cross anchors the Brompton location plan.
• Kensington (W8) — a l shaped dormer in Kensington starts from stucco terraces, listed buildings, and Kensington reads as Georgian and Victorian stucco terraces. Full-width rear dormers on Victorian terraces here are the default in W8. RBKC Planning assesses Kensington l shaped dormers against its own Kensington character guidance, and the location plan we draw for Kensington references Kensington Palace.
• Chelsea (SW3, SW10) — l shaped dormer work in Chelsea means georgian and victorian terraces, listed buildings. Chelsea is Georgian and Victorian terraces, riverside. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent throughout SW3. RBKC Planning decides the Chelsea application, and King's Road anchors the Chelsea location plan.

Does Kensington and Chelsea planning policy restrict a l shaped dormer?

How designation changes a Kensington and Chelsea l shaped dormer: RBKC Planning maintains 38 conservation areas, including Earls Court, Kensington, Chelsea. Inside any of them a Kensington and Chelsea l shaped dormer cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Holland Park sets the tone for Kensington and Chelsea casework.

What Article 4 removes near Kensington and Chelsea: Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. Before pricing a l shaped dormer we check whether the SW3 address is inside the mapped area, because RBKC Planning draws the Kensington and Chelsea boundary street by street rather than across the whole of Kensington and Chelsea.

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 l shaped dormer 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.

What Kensington and Chelsea is built from: 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. That mix decides the l shaped dormer route in Kensington and Chelsea more than the postcode does.

Which neighbouring authorities border Kensington and Chelsea?

• Westminster — cross the Kensington and Chelsea boundary and Westminster City Council takes the l shaped dormer instead, applying 56 conservation areas of its own around SW1. We re-price l shaped dormers at the Kensington and Chelsea edge because Westminster policy and Kensington and Chelsea policy rarely align on l shaped dormer depth.
• Hammersmith and Fulham — cross the Kensington and Chelsea boundary and Hammersmith & Fulham Council takes the l shaped dormer instead, applying 45 conservation areas of its own around W6. We re-price l shaped dormers at the Kensington and Chelsea edge because Hammersmith and Fulham policy and Kensington and Chelsea policy rarely align on l shaped dormer depth.
• Brent — cross the Kensington and Chelsea boundary and Brent Council takes the l shaped dormer instead, applying 22 conservation areas of its own around NW2. We re-price l shaped dormers at the Kensington and Chelsea edge because Brent policy and Kensington and Chelsea policy rarely align on l shaped dormer depth.

Sources for this Kensington and Chelsea l shaped dormer 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.