House Extension Drawings in Richmond upon Thames

Where in Richmond upon Thames does a house extension actually get determined?

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

What changes about a house extension in each part of Richmond upon Thames?

Roof pitch, wall build-up and plot depth change every few Richmond upon Thames streets, and each one changes what a house extension can achieve at that address.

• Hampton (TW12) — house extension work in Hampton means georgian villas, edwardian terraces, 1930s semi-detached. Hampton is Georgian and Edwardian villages. Georgian rear elevations here are usually the listed or locally listed face of the building throughout TW12. Richmond Council decides the Hampton application, and Hampton Court Palace anchors the Hampton location plan.
• Whitton (TW2) — 1930s semi-detached defines Whitton, where 1930s semi-detached set what a house extension can do. 1930s semis here have the deepest rear gardens in the area across TW2. Any Whitton house extension is validated by Richmond Council, with Whitton station the usual Whitton reference point on the site plan.
• Ham (TW10) — Georgian common, post-war estate defines Ham, where georgian villas, post-war estates set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across TW10. Any Ham house extension is validated by Richmond Council, with Ham Common the usual Ham reference point on the site plan.
• Mortlake (SW14) — a house extension in Mortlake starts from victorian and edwardian terraces, and Mortlake reads as Victorian and Edwardian terraces. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage in SW14. Richmond Council assesses Mortlake house extensions against its own Mortlake character guidance, and the location plan we draw for Mortlake references Mortlake station.
• Richmond (TW9, TW10) — Georgian centre, riverside conservation defines Richmond, where georgian terraces, victorian villas set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across TW9. Any Richmond house extension is validated by Richmond Council, with Richmond Green the usual Richmond reference point on the site plan.
• Twickenham (TW1, TW2) — a house extension in Twickenham starts from georgian fragments, victorian terraces, edwardian villas, and Twickenham reads as Georgian and Victorian riverside town. Georgian rear elevations here are usually the listed or locally listed face of the building in TW1. Richmond Council assesses Twickenham house extensions against its own Twickenham character guidance, and the location plan we draw for Twickenham references Twickenham Stadium.
• Kew (TW9) — house extension work in Kew means georgian and edwardian villas. Kew is Georgian and Edwardian villas around the green. Georgian rear elevations here are usually the listed or locally listed face of the building throughout TW9. Richmond Council decides the Kew application, and Kew Gardens anchors the Kew location plan.

Does Richmond upon Thames planning policy restrict a house extension?

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

Article 4 and your Richmond upon Thames house extension: Richmond Council has made no borough-wide direction, so permitted development for a house extension in Richmond upon Thames generally survives outside Richmond upon Thames conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SW13 owner records that a house extension was lawful.

Richmond upon Thames housing stock: 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. Read that before choosing a house extension route in Richmond upon Thames — construction, not postcode, sets what is achievable. Richmond Council charges £548 for a householder application and has 8 weeks to determine it.

Who decides a house extension on the edge of Richmond upon Thames?

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

Sources for this Richmond upon Thames house 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.