020 7864 7245 [email protected] WhatsApp
Property guide · Kensington and Chelsea

Modern flat extensions in Kensington and Chelsea

Purpose-built or converted flats with restricted PD rights. Internal-only alterations dominate.

Quick facts

Property type
Modern flat
Borough
Kensington and Chelsea
Planning authority
RBKC Planning
Article 4 in force
Yes
Conservation areas
38
Drawings from
£840

Modern flat stock in Kensington and Chelsea responds best to extensions that respect the existing rhythm. For Victorian and Edwardian period property, side returns and rear infill are routine. For 1930s suburban, single-storey rear and loft conversions dominate. We design to the block, not the brochure.

London terraced street — typical residential housing for architectural drawings in Kensington & Chelsea
Free fixed-fee quote

Tell us about your project

MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.

  • MCIAT chartered
  • Same working-day reply
  • Fixed fees from £840

Book a call

Speak to a chartered technologist — free 15 minutes

Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.

Which Kensington and Chelsea postcodes does this modern flat project service cover?

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

PostcodeAreaDominant stockWhat it means for a modern flat project
SW1XKnightsbridge / BelgraviaRegency stucco terraces, listed buildingsSW1X straddles a boundary: Knightsbridge / Belgravia addresses fall to Westminster City Council or RBKC Planning, so confirm which authority validates the modern flat project before submitting SW1X drawings.
W14West Kensington / Barons CourtVictorian and Edwardian villasA modern flat project in West Kensington / Barons Court may land with Hammersmith & Fulham Council or RBKC Planning — W14 crosses the boundary, and the W14 policies map decides it street by street.
SW3Chelsea / BromptonGeorgian and Victorian terraces, listed buildingsChelsea / Brompton sits wholly inside SW3, so RBKC Planning validates every modern flat project submitted from an SW3 address.
SW5Earl's CourtStucco terraces, Edwardian mansion blocksA modern flat project at an SW5 address in Earl's Court is determined by RBKC Planning under its own Local Plan policies for Earl's Court.
SW7South Kensington / KnightsbridgeStucco terraces, mansion blocks, listed buildingsSouth Kensington / Knightsbridge is split at SW7. Either RBKC Planning or Westminster City Council can determine a modern flat project here, so the SW7 address is checked against both policies maps first.
SW10West Brompton / World's EndGeorgian and Victorian terraces, listed buildingsSW10 straddles a boundary: West Brompton / World's End addresses fall to RBKC Planning or Hammersmith & Fulham Council, so confirm which authority validates the modern flat project before submitting SW10 drawings.
W8KensingtonStucco terraces, listed buildingsW8 covers Kensington only; RBKC Planning handles the modern flat project, and Kensington case officers apply the W8 conservation-area map.
W10North Kensington / Ladbroke GroveVictorian terraces, post-war estatesNorth Kensington / Ladbroke Grove sits wholly inside W10, so RBKC Planning validates every modern flat project submitted from an W10 address.

Which Kensington and Chelsea neighbourhoods suit a modern flat project best?

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

What local planning policy applies to a modern flat project in Kensington and Chelsea?

Conservation areas covering Kensington and Chelsea: RBKC Planning runs 38, and Notting Hill, Holland Park, Earls Court are the ones Kensington and Chelsea owners meet most. A modern flat project inside a Kensington and Chelsea conservation area loses permitted development, so the Kensington and Chelsea submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Kensington a modern flat project 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 modern flat project 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 modern flat project 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 modern flat project in Kensington and Chelsea is scoped against that stock first. Our Kensington and Chelsea fixed fee starts at £840; the £1,750 Complete package runs the Kensington and Chelsea scheme through RBKC Planning planning and building control in one go.

Which neighbouring authorities border Kensington and Chelsea?

Sources for this Kensington and Chelsea modern flat project 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.

Quote for your modern flat

Start free quoteOr contact us about your project first