Single-storey rear extensions, lofts and side extensions you can build in Kensington and Chelsea without full planning — and the exceptions.
Very little. The borough holds 84 Article 4 areas and 2,609 listed buildings, and its return records no larger home extension decisions at all — not recorded rather than none. It issued 118 lawful development certificates, fewer than any borough except the City of London.
| Measure | Kensington and Chelsea | London |
|---|---|---|
| Article 4 areas | 84 | — |
| Listed buildings | 2,609 | — |
| Conservation areas | 41 | 1,141 |
| Larger home extension decisions | not recorded | 5,576 |
| Lawful development certificates | 118 | 36,657 |
| Withdrawn before decision | 20.3% | 7.4% |
Sources: MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026; a zero means the measure was not recorded for that borough, never that none exist. Article 4, listed building and conservation area counts from the planning.data.gov.uk registers, retrieved 1 September 2026. Open Government Licence v3.0.
In detailSingle-storey rear extension up to 3m deep (attached house) or 4m (detached); side extension up to half the original width; loft conversion up to 40m³ (terraced) or 50m³ (semi-detached); single-storey outbuilding within the curtilage; replacement windows and doors. All subject to material match, eaves setback (20cm), and not facing a highway.
No. Permitted Development rights apply only to houses (Class C3 dwellings). Flats and maisonettes require full planning for almost every external alteration.
Yes — significantly reduced. In a conservation area: side extensions and two-storey rear extensions are not PD; cladding is not PD; chimney removal needs planning; roof additions are restricted.
An LDC is a formal confirmation from the council that your proposal is lawful PD — recommended before building, useful when selling. Costs around £103 for council fees + drawings.
Yes. Building regulations are entirely separate from planning. Permitted Development removes the planning requirement only — you still need building control sign-off for structure, insulation, fire safety, drainage, and ventilation. We deliver both planning and building regs drawings.



Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every Kensington and Chelsea postcode district we draw in, the stock that dominates it and the authority that validates a permitted development scheme there. Kensington and Chelsea fees below are the statutory England rates for 2026, not permitted development scheme estimates.
| Postcode | Area | Dominant stock | What it means for a permitted development scheme |
|---|---|---|---|
| W11 | Notting Hill / Holland Park | Victorian stucco terraces | Notting Hill / Holland Park sits wholly inside W11, so RBKC Planning validates every permitted development scheme submitted from an W11 address. |
| SW1X | Knightsbridge / Belgravia | Regency stucco terraces, listed buildings | SW1X straddles a boundary: Knightsbridge / Belgravia addresses fall to Westminster City Council or RBKC Planning, so confirm which authority validates the permitted development scheme before submitting SW1X drawings. |
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | A permitted development scheme 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. |
| SW3 | Chelsea / Brompton | Georgian and Victorian terraces, listed buildings | SW3 covers Chelsea / Brompton only; RBKC Planning handles the permitted development scheme. |
| SW5 | Earl's Court | Stucco terraces, Edwardian mansion blocks | Earl's Court sits wholly inside SW5, so RBKC Planning validates every permitted development scheme submitted from an SW5 address. |
| SW7 | South Kensington / Knightsbridge | Stucco terraces, mansion blocks, listed buildings | A permitted development scheme in South Kensington / Knightsbridge may land with RBKC Planning or Westminster City Council — SW7 crosses the boundary, and the SW7 policies map decides it street by street. |
| SW10 | West Brompton / World's End | Georgian and Victorian terraces, listed buildings | SW10 straddles a boundary: West Brompton / World's End addresses fall to RBKC Planning or Hammersmith & Fulham Council, so confirm which authority validates the permitted development scheme before submitting SW10 drawings. |
| W8 | Kensington | Stucco terraces, listed buildings | W8 covers Kensington only; RBKC Planning handles the permitted development scheme. |
Roof pitch, wall build-up and plot depth change every few Kensington and Chelsea streets, and each one changes what a permitted development scheme can achieve at that address.
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 permitted development scheme 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 Holland Park a permitted development scheme is judged on the street elevation first.
Article 4 and your Kensington and Chelsea permitted development scheme: 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 permitted development schemes.
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 permitted development scheme 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.
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 permitted development scheme in Kensington and Chelsea is scoped against that stock first.
Sources for this Kensington and Chelsea permitted development scheme 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.

Same-day fixed quote. MCIAT chartered. 98% first-time approval rate.
Start free quoteOr contact us about your project first