Mansard Roof Extensions in Hampton

Where in Hampton does a mansard roof extension actually get determined?

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

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

• Hampton (TW12) — Georgian and Edwardian villages defines Hampton, where georgian villas, edwardian terraces, 1930s semi-detached set what a mansard roof extension can do. Mansards read as original on Georgian terraces across TW12. Any Hampton mansard roof extension is validated by Richmond Council, with Hampton Court Palace the usual Hampton reference point on the site plan.
• Near Hampton: Whitton (TW2) — a mansard roof extension in Whitton starts from 1930s semi-detached, and Whitton reads as 1930s semi-detached. Mansards are rare on 1930s stock — the hipped roof form works against the geometry in TW2. Richmond Council assesses Whitton mansard roof extensions against its own Whitton character guidance, and the location plan we draw for Whitton references Whitton station.
• Near Hampton: Ham (TW10) — a mansard roof extension in Ham starts from georgian villas, post-war estates, and Ham reads as Georgian common, post-war estate. Mansards read as original on Georgian terraces in TW10. Richmond Council assesses Ham mansard roof extensions against its own Ham character guidance, and the location plan we draw for Ham references Ham Common.
• Near Hampton: Mortlake (SW14) — a mansard roof extension in Mortlake starts from victorian and edwardian terraces, and Mortlake reads as Victorian and Edwardian terraces. A mansard on a Victorian terrace almost always needs full planning permission in SW14. Richmond Council assesses Mortlake mansard roof extensions against its own Mortlake character guidance, and the location plan we draw for Mortlake references Mortlake station.
• Near Hampton: Richmond (TW9, TW10) — mansard roof extension work in Richmond means georgian terraces, victorian villas. Richmond is Georgian centre, riverside conservation. Mansards read as original on Georgian terraces throughout TW9. Richmond Council decides the Richmond application, and Richmond Green anchors the Richmond location plan.
• Near Hampton: Twickenham (TW1, TW2) — a mansard roof extension in Twickenham starts from georgian fragments, victorian terraces, edwardian villas, and Twickenham reads as Georgian and Victorian riverside town. Mansards read as original on Georgian terraces in TW1. Richmond Council assesses Twickenham mansard roof extensions against its own Twickenham character guidance, and the location plan we draw for Twickenham references Twickenham Stadium.
• Near Hampton: Kew (TW9) — mansard roof extension work in Kew means georgian and edwardian villas. Kew is Georgian and Edwardian villas around the green. Mansards read as original on Georgian terraces throughout TW9. Richmond Council decides the Kew application, and Kew Gardens anchors the Kew location plan.

Does Hampton planning policy restrict a mansard roof extension?

Hampton conservation designations: there are 72 across Richmond Council, Barnes Village, Ham Common, Richmond Green among them. Designation costs a Hampton owner the permitted-development route: a mansard roof extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Kew Green is the Hampton designation that most often changes a mansard roof extension design.

No blanket Article 4 over Hampton: Richmond Council has not withdrawn permitted development across Hampton, so a mansard roof extension outside a Hampton conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a TW12 owner wants on file.

What Hampton is built from: Georgian in Richmond Green and Twickenham; Edwardian villas in Barnes and East Sheen; 1930s semi-detached in Whitton; riverside cottages along the Thames. Highest conservation area coverage in London; Royal Parks and Thames corridor add heritage layers; design quality heavily scrutinised. That mix decides the mansard roof extension route in Hampton more than the postcode does, and it is what a Richmond Council case officer reads first. A householder application costs £548 paid to Richmond Council direct, with 8 weeks to a decision once validated.

Who decides a mansard roof extension on the edge of Hampton?

• Hounslow — the Hounslow boundary runs against Richmond upon Thames, so a mansard roof extension a street from Hampton is decided by Hounslow Council instead. Hounslow runs 30 conservation areas across W3 and its neighbours, which is why mansard roof extensions priced for Hampton are re-checked against Hounslow policy whenever the Hampton address sits on that edge.
• Kingston upon Thames — the Kingston upon Thames boundary runs against Richmond upon Thames, so a mansard roof extension a street from Hampton is decided by Kingston Council instead. Kingston upon Thames runs 22 conservation areas across KT1 and its neighbours, which is why mansard roof extensions priced for Hampton are re-checked against Kingston upon Thames policy whenever the Hampton address sits on that edge.
• Wandsworth — the Wandsworth boundary runs against Richmond upon Thames, so a mansard roof extension a street from Hampton is decided by Wandsworth Council instead. Wandsworth runs 45 conservation areas across SW8 and its neighbours, which is why mansard roof extensions priced for Hampton are re-checked against Wandsworth policy whenever the Hampton address sits on that edge.
• Hammersmith and Fulham — cross the Hampton boundary and Hammersmith & Fulham Council takes the mansard roof extension instead, applying 45 conservation areas of its own around W6. We re-price mansard roof extensions at the Hampton edge because Hammersmith and Fulham policy and Richmond upon Thames policy rarely align on mansard roof extension depth.

Sources for this Hampton 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.