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Planning guide · Kensington and Chelsea

Stucco and railings: Kensington and Chelsea heritage rules

Kensington and Chelsea has 38 conservation areas. What changes inside them, how Heritage Statements work, and which alterations still qualify.

Quick answer

Borough
Kensington and Chelsea
Planning authority
RBKC Planning
Article 4 in force
Yes
Conservation areas
38
Statutory determination
8 weeks
Our approval rate
98% first time

London terraced street — typical residential housing for planning drawings in Kensington & Chelsea

Why do so many Kensington and Chelsea applications never get decided?

Because they are withdrawn first. The borough withdrew 20.3% of applications before determination, the highest rate in London, against 7.4% across the capital. Its 41 conservation areas cover 919 hectares and it holds 2,609 listed buildings, so schemes get renegotiated rather than refused.

MeasureKensington and ChelseaLondon
Conservation areas411,141
Designated area919 ha
Largest areaHolland Park, 74 ha
Listed buildings2,609
Withdrawn before decision20.3%7.4%
Householder approval90.2%83.0%

Sources: conservation area counts and boundaries from the planning.data.gov.uk register, retrieved 1 September 2026, with hectares computed from the published boundaries. Listed building and Article 4 counts from the planning.data.gov.uk designation registers. Decision figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026. Open Government Licence v3.0.

Is a Kensington and Chelsea address inside a conservation area, an Article 4 area, or both?

In this borough the honest answer is usually both, which is why the map carries the two layers separately. Enter a postcode and the check happens inside the page — nothing is looked up remotely — and it will show which designations the point falls within. The boundaries are simplified polygons, so for a property on the edge of an area the map is a strong steer and the council’s adopted plan is the decision.

Kensington and Chelsea is designated more thoroughly than almost anywhere in the country, and it is the second layer that catches people out. The register holds 84 Article 4 direction areas for the borough — more than double the number of conservation areas — so a single address can sit inside a conservation area and inside two or three overlapping directions at the same time, each one removing a different permitted development right. Around 919 hectares of the borough fall inside conservation boundaries. Holland Park is the largest single area at 73.6 hectares; the smallest, The Billings, is 0.7. Two things are recorded better here than anywhere else in this map series: every area has a council document filed against it, and every area has a designation date, the first in 1968 and the latest in 2019. The working assumption for a house here is that nothing is permitted development until both layers have been checked against the address.

The 84 Article 4 areas, the conservation boundaries and their dates are drawn from planning.data.gov.uk — its conservation-area and article-4-direction-area datasets — read on 15 August 2026 and verified again on 1 September 2026. Contains public sector information licensed under the Open Government Licence v3.0

In detail

Answers for Kensington and Chelsea

How many conservation areas does Kensington and Chelsea have?

Kensington and Chelsea has 38 designated conservation areas, including Kensington, Chelsea, Notting Hill, Holland Park, Earls Court.

What changes need planning in a Kensington and Chelsea conservation area?

Any external alteration visible from a public space typically requires full planning permission inside a conservation area: roof additions, dormers, replacement windows, rendering, hardstanding, and demolition. Internal works generally do not, unless the property is also listed.

Do I need a Heritage Statement in Kensington and Chelsea?

Yes — every application inside a conservation area requires a Heritage Statement. It must address the conservation area character appraisal, identify heritage assets, and explain how the design preserves or enhances character. We prepare this as part of every conservation-area application.

Can I have a roof extension or mansard in a Kensington and Chelsea conservation area?

Rear mansards and dormers are routinely approved in many London conservation areas where the design matches the terrace's existing roofscape — particularly in Hackney, Islington, Tower Hamlets, Lambeth and Southwark. Front-facing dormers are almost universally refused.

How long does conservation area approval take in Kensington and Chelsea?

RBKC Planning statutory determination is 8 weeks for householder applications. Conservation officer consultation adds 2–3 weeks in practice. Expect 11–14 weeks from validation to decision.

Related guides for Kensington and Chelsea
A printed planning application drawing set — proposed elevations, floor plans and the os location plan with the site outlined in red — conservation area planning in Kensington and Chelsea
The planning set that goes to the council through the Planning Portal: proposed elevations, plans, and the OS location plan with your site outlined.
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Which Kensington and Chelsea postcodes does this conservation area application service cover?

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

PostcodeAreaDominant stockWhat it means for a conservation area application
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 conservation area application before submitting SW1X drawings.
W14West Kensington / Barons CourtVictorian and Edwardian villasWest Kensington / Barons Court is split at W14. Either Hammersmith & Fulham Council or RBKC Planning can determine a conservation area application here, so the W14 address is checked against both policies maps first.
SW3Chelsea / BromptonGeorgian and Victorian terraces, listed buildingsA conservation area application at an SW3 address in Chelsea / Brompton is determined by RBKC Planning under its own Local Plan policies for Chelsea / Brompton.
SW5Earl's CourtStucco terraces, Edwardian mansion blocksA conservation area application 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 buildingsA conservation area application 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.
SW10West Brompton / World's EndGeorgian and Victorian terraces, listed buildingsWest Brompton / World's End is split at SW10. Either RBKC Planning or Hammersmith & Fulham Council can determine a conservation area application here, so the SW10 address is checked against both policies maps first.
W8KensingtonStucco terraces, listed buildingsW8 covers Kensington only; RBKC Planning handles the conservation area application.
W10North Kensington / Ladbroke GroveVictorian terraces, post-war estatesA conservation area application at an W10 address in North Kensington / Ladbroke Grove is determined by RBKC Planning under its own Local Plan policies for North Kensington / Ladbroke Grove.

What changes about a conservation area application 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 conservation area application can achieve at that address.

How do conservation areas and Article 4 affect a conservation area application in Kensington and Chelsea?

Conservation areas covering Kensington and Chelsea: RBKC Planning runs 38, and Chelsea, Notting Hill, Holland Park are the ones Kensington and Chelsea owners meet most. A conservation area application 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 conservation area application is judged on the street elevation first.

Article 4 and your Kensington and Chelsea conservation area application: 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 conservation area applications.

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 conservation area application 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.

Kensington and Chelsea housing stock: 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. Read that before choosing a conservation area application route in Kensington and Chelsea — construction, not postcode, sets what is achievable.

Who decides a conservation area application on the edge of Kensington and Chelsea?

Sources for this Kensington and Chelsea conservation area application 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.

Conservation area planning in Kensington and Chelsea — a measured survey being recorded on site
A measured survey being recorded on site — conservation area planning in Kensington and Chelsea.

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