Mansard Roof Extensions in Teddington

Which postcode districts around Teddington do we cover for mansard roof extension work?

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

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

• Teddington (TW11) — a mansard roof extension in Teddington starts from edwardian villas, victorian terraces, and Teddington reads as Edwardian villas, Victorian terraces. A mansard on a Victorian terrace almost always needs full planning permission in TW11. Richmond Council assesses Teddington mansard roof extensions against its own Teddington character guidance, and the location plan we draw for Teddington references Teddington Lock.
• Near Teddington: Ham (TW10) — mansard roof extension work in Ham means georgian villas, post-war estates. Ham is Georgian common, post-war estate. Mansards read as original on Georgian terraces throughout TW10. Richmond Council decides the Ham application, and Ham Common anchors the Ham location plan.
• Near Teddington: Mortlake (SW14) — Victorian and Edwardian terraces defines Mortlake, 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 SW14. Any Mortlake mansard roof extension is validated by Richmond Council, with Mortlake station the usual Mortlake reference point on the site plan.
• Near Teddington: 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 Teddington: 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 Teddington: Kew (TW9) — a mansard roof extension in Kew starts from georgian and edwardian villas, and Kew reads as Georgian and Edwardian villas around the green. Mansards read as original on Georgian terraces in TW9. Richmond Council assesses Kew mansard roof extensions against its own Kew character guidance, and the location plan we draw for Kew references Kew Gardens.
• Near Teddington: Barnes (SW13) — Georgian and Edwardian village defines Barnes, where georgian villas, edwardian terraces set what a mansard roof extension can do. Mansards read as original on Georgian terraces across SW13. Any Barnes mansard roof extension is validated by Richmond Council, with Barnes Common the usual Barnes reference point on the site plan.

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

Conservation areas covering Teddington: Richmond Council runs 72, and Richmond Green, Kew Green, Hampton Wick are the ones Teddington owners meet most. A mansard roof extension inside a Teddington conservation area loses permitted development, so the Teddington submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Barnes Village a mansard roof extension is judged on the street elevation first.

Article 4 and your Teddington mansard roof extension: Richmond Council has made no borough-wide direction, so permitted development for a mansard roof extension in Teddington generally survives outside Teddington conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a TW11 owner records that a mansard roof extension was lawful.

The building fabric around Teddington: 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. A mansard roof extension in Teddington 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 Richmond Council.

What happens if a Teddington property sits on a boundary?

• Hounslow — adjoining Teddington, with 30 conservation areas centred on W3. A mansard roof extension on the far side of the Teddington line is determined by Hounslow Council, so the Teddington quote for mansard roof extensions is checked against Hounslow guidance before it is issued.
• Kingston upon Thames — the Kingston upon Thames boundary runs against Richmond upon Thames, so a mansard roof extension a street from Teddington 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 Teddington are re-checked against Kingston upon Thames policy whenever the Teddington address sits on that edge.
• Wandsworth — the Wandsworth boundary runs against Richmond upon Thames, so a mansard roof extension a street from Teddington is decided by Wandsworth Council instead. Wandsworth runs 45 conservation areas across SW8 and its neighbours, which is why mansard roof extensions priced for Teddington are re-checked against Wandsworth policy whenever the Teddington address sits on that edge.
• Hammersmith and Fulham — adjoining Teddington, with 45 conservation areas centred on W6. A mansard roof extension on the far side of the Teddington line is determined by Hammersmith & Fulham Council, so the Teddington quote for mansard roof extensions is checked against Hammersmith and Fulham guidance before it is issued.

Sources for this Teddington 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.