About the Mortlake Conservation Area
The Mortlake Conservation Area covers about 21 hectares and was designated by London Borough of Richmond upon Thames in 1996. Inside the boundary are 12 listed buildings (3 Grade II*, 9 Grade II). The most significant is Limes House and Forecourt Piers, 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.
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.
- Limes House and Forecourt PiersGrade II*
- Mausoleum of Sir Richard and Lady Burton, Churchyard of St Mary MagdalenGrade II*
- Parish Church of St MaryGrade II*
- 117, High Street Sw14Grade II
- 44 and 46, Victoria RoadGrade II
- Acacia HouseGrade II
- Leyden HouseGrade II
- Riverside HouseGrade II
- Suthrey House With Attached RailingsGrade II
- Thames Bank HouseGrade II
- Thames CottageGrade II
- Tudor LodgeGrade II
The council’s appraisal
WEBMortlake Conservation Area AppraisalLondon Borough of Richmond upon Thames’s description of the area’s character — what planners look at when you apply.Open on council site ↗Nearby conservation areas
Boundary and listed buildings from London Borough of Richmond upon Thames and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.