About the Uxbridge Lock Conservation Area
The Uxbridge Lock Conservation Area covers about 9.0 hectares and was designated by London Borough of Hillingdon in 2003. Inside the boundary are 8 listed buildings (1 Grade II*, 7 Grade II). The most significant is The Crown and Treaty Inn, Grade II*. 5 Article 4 directions over the area remove further householder rights, on top of the conservation area limits below. 13 Tree Preservation Order records overlap the area; every other tree here still needs six weeks’ notice before work. 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.
- Changes of use from commercial, business and service uses to dwellinghousesChange of use
- Houses of Multiple Occupation (HMOs)Householder works
- Residential extensionsHouseholder works
- Construction of new dwellinghouses in employment areasHouseholder works
- Construction of new dwellinghouses in employment areasHouseholder works
- Construction of new dwellinghouses in employment areasHouseholder works
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.
- The Crown and Treaty InnGrade II*
- Canal Bridge Number 184 to East of New Mills and Lock AttachedGrade II
- King's Mill CottageGrade II
- New MillsGrade II
- Old Mill CottageGrade II
- ShambaGrade II
- The Old Mill Club Chris Lee Carriage Company LimitedGrade II
- The Old Mill HouseGrade 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.