Basement Conversion Drawings in Kensington and Chelsea

Which Kensington and Chelsea postcodes does this basement conversion service cover?

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

What changes about a basement conversion in each part of Kensington and Chelsea?

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

• Earl's Court (SW5) — Victorian stucco terraces, mansion blocks defines Earl's Court, where stucco terraces, edwardian mansion blocks set what a basement conversion can do. Edwardian houses rarely have a usable cellar across SW5. Any Earl's Court basement conversion 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 basement conversion in South Kensington starts from stucco terraces, mansion blocks, listed buildings, and South Kensington reads as Victorian and Edwardian stucco terraces. Mansion blocks sit on shared foundations in SW7. RBKC Planning assesses South Kensington basement conversions against its own South Kensington character guidance, and the location plan we draw for South Kensington references V&A.
• Knightsbridge (SW1X, SW7) — Regency and Victorian terraces, luxury defines Knightsbridge, where regency and victorian terraces, mansion blocks set what a basement conversion can do. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged across SW1X. Any Knightsbridge basement conversion is validated by RBKC Planning, with Harrods the usual Knightsbridge reference point on the site plan.
• North Kensington (W10) — basement conversion work in North Kensington means victorian terraces, post-war estates. North Kensington is Victorian terraces, post-war estates. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged throughout W10. RBKC Planning decides the North Kensington application, and Golborne Road anchors the North Kensington location plan.
• Brompton (SW3) — basement conversion work in Brompton means stucco terraces, edwardian mansion blocks. Brompton is Victorian stucco terraces, mansion blocks. Edwardian houses rarely have a usable cellar throughout SW3. RBKC Planning decides the Brompton application, and Brompton Cross anchors the Brompton location plan.
• Kensington (W8) — basement conversion work in Kensington means stucco terraces, listed buildings. Kensington is Georgian and Victorian stucco terraces. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged throughout W8. RBKC Planning decides the Kensington application, and Kensington Palace anchors the Kensington location plan.
• Chelsea (SW3, SW10) — Georgian and Victorian terraces, riverside defines Chelsea, where georgian and victorian terraces, listed buildings set what a basement conversion can do. Georgian houses here already have a vault and a lower-ground floor across SW3. Any Chelsea basement conversion is validated by RBKC Planning, with King's Road the usual Chelsea reference point on the site plan.

How do conservation areas and Article 4 affect a basement conversion in Kensington and Chelsea?

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

Article 4 and your Kensington and Chelsea basement conversion: Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. At a SW3 address that matters twice over, because RBKC Planning applies the direction unevenly across Kensington and Chelsea — we read the Kensington and Chelsea policies map for the exact SW3 address before quoting basement conversions.

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 basement conversion 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.

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 basement conversion route in Kensington and Chelsea more than the postcode does, and it is what a RBKC Planning case officer reads first. A householder application costs £548 paid to RBKC Planning direct, with 8 weeks to a decision once validated.

Who decides a basement conversion on the edge of Kensington and Chelsea?

• Westminster — the Westminster boundary runs against Kensington and Chelsea, so a basement conversion 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 basement conversions 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 basement conversion 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 basement conversions 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 basement conversion instead, applying 22 conservation areas of its own around NW2. We re-price basement conversions at the Kensington and Chelsea edge because Brent policy and Kensington and Chelsea policy rarely align on basement conversion depth.

Sources for this Kensington and Chelsea basement conversion 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.