Mansard Roof Extensions in Hammersmith and Fulham

Which postcode districts around Hammersmith and Fulham do we cover for mansard roof extension work?

Every Hammersmith and Fulham postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. Hammersmith and Fulham 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 Hammersmith and Fulham?

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

• Hammersmith (W6) — Victorian terraces, riverside character defines Hammersmith, where 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 W6. Any Hammersmith mansard roof extension is validated by Hammersmith & Fulham Council, with Hammersmith Bridge the usual Hammersmith reference point on the site plan.
• Shepherd's Bush (W12) — a mansard roof extension in Shepherd's Bush starts from victorian and edwardian terraces, and Shepherd's Bush reads as Victorian and Edwardian terraces. A mansard on a Victorian terrace almost always needs full planning permission in W12. Hammersmith & Fulham Council assesses Shepherd's Bush mansard roof extensions against its own Shepherd's Bush character guidance, and the location plan we draw for Shepherd's Bush references Westfield London.
• White City (W12) — mansard roof extension work in White City means post-war estates, new-build. White City is regenerated quarter, post-war estates. Mansards on post-war blocks are a structural and fire-strategy exercise before they are an aesthetic one throughout W12. Hammersmith & Fulham Council decides the White City application, and Television Centre anchors the White City location plan.
• Parsons Green (SW6) — Victorian bay-fronted terraces around the green defines Parsons Green, where victorian terraces set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across SW6. Any Parsons Green mansard roof extension is validated by Hammersmith & Fulham Council, with Parsons Green park the usual Parsons Green reference point on the site plan.
• Barons Court (W14) — mansard roof extension work in Barons Court means edwardian mansion blocks, victorian terraces. Barons Court is Edwardian mansion blocks, Victorian terraces. A mansard on a Victorian terrace almost always needs full planning permission throughout W14. Hammersmith & Fulham Council decides the Barons Court application, and Barons Court Tube anchors the Barons Court location plan.
• Brackenbury Village (W6) — Victorian conservation area defines Brackenbury Village, where victorian terraces set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across W6. Any Brackenbury Village mansard roof extension is validated by Hammersmith & Fulham Council, with Ravenscourt Park the usual Brackenbury Village reference point on the site plan.
• Sand's End (SW6) — a mansard roof extension in Sand's End starts from victorian terraces, new-build, and Sand's End reads as Victorian terraces, riverside regen. A mansard on a Victorian terrace almost always needs full planning permission in SW6. Hammersmith & Fulham Council assesses Sand's End mansard roof extensions against its own Sand's End character guidance, and the location plan we draw for Sand's End references Imperial Wharf.

How do conservation areas and Article 4 affect a mansard roof extension in Hammersmith and Fulham?

Conservation areas covering Hammersmith and Fulham: Hammersmith & Fulham Council runs 45, and Parsons Green, Walham Green, Hammersmith Grove are the ones Hammersmith and Fulham owners meet most. A mansard roof extension inside a Hammersmith and Fulham conservation area loses permitted development, so the Hammersmith and Fulham submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Hammersmith Grove a mansard roof extension is judged on the street elevation first.

What Article 4 removes near Hammersmith and Fulham: Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets. Before pricing a mansard roof extension we check whether the SW6 address is inside the mapped area, because Hammersmith & Fulham Council draws the Hammersmith and Fulham boundary street by street rather than across the whole of Hammersmith and Fulham.

The building fabric around Hammersmith and Fulham: Victorian and Edwardian terraces — particularly two-storey bay-fronted terraces south of the river in Fulham and Parsons Green; mansion blocks along main roads. Suburban-feel residential streets with strong conservation area coverage; well-established mansard precedents on many terraces. A mansard roof extension in Hammersmith and Fulham is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Hammersmith & Fulham Council.

Which neighbouring authorities border Hammersmith and Fulham?

• Kensington and Chelsea — the Kensington and Chelsea boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith and Fulham is decided by RBKC Planning instead. Kensington and Chelsea runs 38 conservation areas across SW1 and its neighbours, which is why mansard roof extensions priced for Hammersmith and Fulham are re-checked against Kensington and Chelsea policy whenever the Hammersmith and Fulham address sits on that edge.
• Brent — adjoining Hammersmith and Fulham, with 22 conservation areas centred on NW2. A mansard roof extension on the far side of the Hammersmith and Fulham line is determined by Brent Council, so the Hammersmith and Fulham quote for mansard roof extensions is checked against Brent guidance before it is issued.
• Ealing — the Ealing boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith and Fulham is decided by Ealing Council instead. Ealing runs 30 conservation areas across W3 and its neighbours, which is why mansard roof extensions priced for Hammersmith and Fulham are re-checked against Ealing policy whenever the Hammersmith and Fulham address sits on that edge.
• Hounslow — the Hounslow boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith and Fulham is decided by Hounslow Council instead. Hounslow runs 30 conservation areas across W3 and its neighbours, which is why mansard roof extensions priced for Hammersmith and Fulham are re-checked against Hounslow policy whenever the Hammersmith and Fulham address sits on that edge.

Sources for this Hammersmith and Fulham 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.