About the Cranford Park Conservation Area
The Cranford Park Conservation Area covers about 89 hectares within London Borough of Hillingdon’s area. Inside the boundary are 12 listed buildings (1 Grade II*, 11 Grade II). The most significant is Church of St Dunstan, Grade II*. 1 Article 4 direction over the area removes further householder rights, on top of the conservation area limits below. 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.
- Residential extensionsHouseholder works
- 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.
- Church of St DunstanGrade II*
- Bridge Over River CraneGrade II
- Cellars of Former Cranford HouseGrade II
- Cranford House StablesGrade II
- Cranford Park BridgeGrade II
- Curved Wall to South of West End of StablesGrade II
- Garden Walls to West of Cranford House StablesGrade II
- Ha Ha Walls to South and South West of Cranford House StablesGrade II
- Stansfield HouseGrade II
- The Village Lock-Up (also Known As the Round House)Grade II
- Wall to South of East End of StablesGrade II
- Walls to North of StablesGrade II
Nearby conservation areas
Boundary and listed buildings from London Borough of Hillingdon and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.