About the Blandford St Mary and Bryanston Conservation Area
The Blandford St Mary and Bryanston Conservation Area covers about 309 hectares and was designated by Dorset Council in 1972. Inside the boundary are 13 listed buildings (2 Grade I, 11 Grade II). The most significant is Bryanston School, Grade I. 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.
- Bryanston SchoolGrade I
- The Portman ChapelGrade I
- 5-11 Damory StreetGrade II
- Bryanston FarmhouseGrade II
- Church of St MartinGrade II
- Farm Buildings South of Bryanston Home FarmhouseGrade II
- Former Service Range to Old Bryanston House, 20 Metres West of the Church of St MartinGrade II
- Gough Building, Bryanston SchoolGrade II
- Middle LodgeGrade II
- Stable Block to Old Bryanston House 20 Metres West of Portman ChapelGrade II
- The Thatched CottageGrade II
- World War II Anti-Tank Obstacles; to the South-East of Deer Park HolmGrade II
- World War II pillbox in the grounds of the Telephone ExchangeGrade II
Nearby conservation areas
Boundary and listed buildings from Dorset Council and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.