Mansard Roof Extensions in Hammersmith

Which Hammersmith postcodes does this mansard roof extension service cover?

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

What changes about a mansard roof extension in each part of Hammersmith?

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

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

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

Conservation areas covering Hammersmith: Hammersmith & Fulham Council runs 45, and Walham Green, Hammersmith Grove, Brackenbury Village are the ones Hammersmith owners meet most. A mansard roof extension inside a Hammersmith conservation area loses permitted development, so the Hammersmith submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Parsons Green a mansard roof extension is judged on the street elevation first.

What Article 4 removes near Hammersmith: 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 W6 address is inside the mapped area, because Hammersmith & Fulham Council draws the Hammersmith boundary street by street rather than across the whole of Hammersmith.

What Hammersmith is built from: 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. That mix decides the mansard roof extension route in Hammersmith more than the postcode does. Our fixed fee for mansard roof extensions in Hammersmith starts at £1,575, against £1,750 for the Complete package that carries a Hammersmith scheme through Hammersmith & Fulham Council planning and building regulations together.

What happens if a Hammersmith property sits on a boundary?

• Ealing — the Ealing boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith 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 are re-checked against Ealing policy whenever the Hammersmith address sits on that edge.
• Hounslow — cross the Hammersmith boundary and Hounslow Council takes the mansard roof extension instead, applying 30 conservation areas of its own around W3. We re-price mansard roof extensions at the Hammersmith edge because Hounslow policy and Hammersmith and Fulham policy rarely align on mansard roof extension depth.
• Richmond upon Thames — the Richmond upon Thames boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith is decided by Richmond Council instead. Richmond upon Thames runs 72 conservation areas across SW13 and its neighbours, which is why mansard roof extensions priced for Hammersmith are re-checked against Richmond upon Thames policy whenever the Hammersmith address sits on that edge.
• Wandsworth — the Wandsworth boundary runs against Hammersmith and Fulham, so a mansard roof extension a street from Hammersmith is decided by Wandsworth Council instead. Wandsworth runs 45 conservation areas across SW8 and its neighbours, which is why mansard roof extensions priced for Hammersmith are re-checked against Wandsworth policy whenever the Hammersmith address sits on that edge.

Sources for this Hammersmith 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.