About the Turnham Green Conservation Area
The Turnham Green Conservation Area covers about 38 hectares and was designated by London Borough of Hounslow in 1975. Inside the boundary are 19 listed buildings (1 Grade II*, 18 Grade II). The most significant is Voysey House, Grade II*. Part of the area lies in flood zone 3, so an extension may need a flood risk assessment.
What changes inside the conservation area
Conservation areas are “Article 2(3) land”. You keep most permitted development rights, but these are removed or tightened.
- Rear extensionElsewhere: 3 m · 6 m with PANo 6 m / 8 m prior approval
- Two-storey extensionElsewhere: 3 mNeeds planning permission
- Side extensionElsewhere: Half the widthNeeds planning permission
- Loft conversionElsewhere: 50 m³Needs planning permission
- Garden roomElsewhere: 2.5 m high by boundariesNot beside the house
- PorchElsewhere: 3 m²Same limits
- Solar panelsElsewhere: 0.2 m projectionSame limits
- Air source heat pumpElsewhere: 1 unitNot facing the road
- Fences, walls and gatesElsewhere: 2 m · 1 m by a roadSame limits
- External claddingElsewhere: Matching materialsNeeds planning permission
- Tree workElsewhere: No notice6 weeks’ notice to the council
- Demolition (over 115 m³)Elsewhere: AllowedNeeds planning permission
Limits for a semi-detached house under the GPDO 2015. An Article 4 direction can remove more.
Article 4 directions here
These overlap the conservation area. Householder directions remove more of the rights above; change-of-use ones don’t affect extending a house.
- Dwellinghouses (C3) to small HMOs (C4) - borough-wide Article 4 DirectionChange of use
- Change of use or development that would result in new dwellings (Class MA/ZA)Change of use
Listed buildings in the conservation area
Any work affecting these needs listed building consent, inside or out. Each links to its entry on the National Heritage List.
- Voysey HouseGrade II*
- 10 and 11, Heathfield Terrace W4Grade II
- 12 and 13, Heathfield Terrace W4Grade II
- 16 to 19, Heathfield TerraceGrade II
- 20, Heathfield Terrace W4Grade II
- 21, Heathfield Terrace W4Grade II
- 22-26, Heathfield Terrace W4Grade II
- 2a, Heathfield Terrace W4Grade II
- Afton House Chiswick Memorial ClubGrade II
- Arlington CottagesGrade II
- Chiswick Town Hall (former)Grade II
- Chiswick War MemorialGrade II
- Christ ChurchGrade II
- Crown and Anchor Public HouseGrade II
- Our Lady of Grace and St Edward Roman Catholic ChurchGrade II
- Presbytery of Roman Catholic Church of Our Lady of GraceGrade II
- Railings to Garden of Number 24Grade II
- The Old Packhorse Public HouseGrade II
- Two K6 Telephone Kiosks, junction Town Hall Avenue/Chiswick High RoadGrade II
Nearby conservation areas
Boundary and listed buildings from London Borough of Hounslow and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.