Mansard Roof Extensions in Holland Park

Which Holland Park postcodes does this mansard roof extension service cover?

Every Holland Park postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. Holland Park fees below are the statutory England rates for 2026, not mansard roof extension estimates.

How does a mansard roof extension differ street by street across Holland Park?

Roof pitch, wall build-up and plot depth change every few Holland Park streets, and each one changes what a mansard roof extension can achieve at that address.

• Holland Park (W11, W14) — a mansard roof extension in Holland Park starts from victorian and edwardian villas, and Holland Park reads as Victorian villas around the park. A mansard on a Victorian terrace almost always needs full planning permission in W11. RBKC Planning assesses Holland Park mansard roof extensions against its own Holland Park character guidance, and the location plan we draw for Holland Park references Holland Park.
• Near Holland Park: South Kensington (SW7) — a mansard roof extension in South Kensington starts from stucco terraces, mansion blocks, listed buildings, and South Kensington reads as Victorian and Edwardian stucco terraces. A mansard over a mansion block engages Part B fire strategy and the freeholder in equal measure in SW7. RBKC Planning assesses South Kensington mansard roof extensions against its own South Kensington character guidance, and the location plan we draw for South Kensington references V&A.
• Near Holland Park: Knightsbridge (SW1X, SW7) — Regency and Victorian terraces, luxury defines Knightsbridge, where regency and victorian terraces, mansion blocks set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across SW1X. Any Knightsbridge mansard roof extension is validated by RBKC Planning, with Harrods the usual Knightsbridge reference point on the site plan.
• Near Holland Park: North Kensington (W10) — Victorian terraces, post-war estates defines North Kensington, where victorian terraces, post-war estates set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across W10. Any North Kensington mansard roof extension is validated by RBKC Planning, with Golborne Road the usual North Kensington reference point on the site plan.
• Near Holland Park: Brompton (SW3) — mansard roof extension work in Brompton means stucco terraces, edwardian mansion blocks. Brompton is Victorian stucco terraces, mansion blocks. Edwardian parapets give a mansard a clean base line throughout SW3. RBKC Planning decides the Brompton application, and Brompton Cross anchors the Brompton location plan.
• Near Holland Park: Kensington (W8) — mansard roof extension work in Kensington means stucco terraces, listed buildings. Kensington is Georgian and Victorian stucco terraces. A mansard on a Victorian terrace almost always needs full planning permission throughout W8. RBKC Planning decides the Kensington application, and Kensington Palace anchors the Kensington location plan.
• Near Holland Park: Chelsea (SW3, SW10) — a mansard roof extension in Chelsea starts from georgian and victorian terraces, listed buildings, and Chelsea reads as Georgian and Victorian terraces, riverside. Mansards read as original on Georgian terraces in SW3. RBKC Planning assesses Chelsea mansard roof extensions against its own Chelsea character guidance, and the location plan we draw for Chelsea references King's Road.

What local planning policy applies to a mansard roof extension in Holland Park?

Conservation areas covering Holland Park: RBKC Planning runs 38, and Notting Hill, Holland Park, Earls Court are the ones Holland Park owners meet most. A mansard roof extension inside a Holland Park conservation area loses permitted development, so the Holland Park submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Kensington a mansard roof extension is judged on the street elevation first.

Article 4 and your Holland Park mansard roof extension: Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. At a W11 address that matters twice over, because RBKC Planning applies the direction unevenly across Holland Park — we read the Holland Park policies map for the exact W11 address before quoting mansard roof extensions.

Digging below a Holland Park 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 mansard roof extension in Holland Park involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a Holland Park dig within 3 m of a neighbour, and RBKC Planning expects the W11 ground conditions addressed in the application.

Holland Park 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 mansard roof extension route in Holland Park — construction, not postcode, sets what is achievable. RBKC Planning charges £548 for a householder application and has 8 weeks to determine it.

Which neighbouring authorities border Holland Park?

• Westminster — adjoining Holland Park, with 56 conservation areas centred on SW1. A mansard roof extension on the far side of the Holland Park line is determined by Westminster City Council, so the Holland Park quote for mansard roof extensions is checked against Westminster guidance before it is issued.
• Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Kensington and Chelsea, so a mansard roof extension a street from Holland Park is decided by Hammersmith & Fulham Council instead. Hammersmith and Fulham runs 45 conservation areas across W6 and its neighbours, which is why mansard roof extensions priced for Holland Park are re-checked against Hammersmith and Fulham policy whenever the Holland Park address sits on that edge.
• Brent — the Brent boundary runs against Kensington and Chelsea, so a mansard roof extension a street from Holland Park is decided by Brent Council instead. Brent runs 22 conservation areas across NW2 and its neighbours, which is why mansard roof extensions priced for Holland Park are re-checked against Brent policy whenever the Holland Park address sits on that edge.

Sources for this Holland Park mansard roof extension 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.