About the Bletchley Conservation Area
The Bletchley Conservation Area covers about 21 hectares and was designated by Milton Keynes City Council in 2020. Inside the boundary are 22 listed buildings (1 Grade I, 1 Grade II*, 20 Grade II). The most significant is Church of St Mary, Grade I. 2 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.
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.
- Article 4 Direction relating to Houses in Multiple Occupation (HIMO) - Non immediate directionHouseholder works
- Article 4 Direction relating to Houses in Multiple Occupation (HIMO) - Immediate directionHouseholder 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.
- Church of St MaryGrade I
- Bletchley Rectory Cottages and MuseumGrade II*
- Bletchley Park HouseGrade II
- Block A at Bletchley ParkGrade II
- Block B at Bletchley ParkGrade II
- Block C, Bletchley ParkGrade II
- Block D and its ancillary buildingsGrade II
- Cottages 1, 2 and 3Grade II
- Freefolk CottageGrade II
- Gate Piers, Gates, Walls and Railings South of Park LodgeGrade II
- Gatehouse and attached south rangeGrade II
- H Block at Bletchley ParkGrade II
- Hut 1 at Bletchley ParkGrade II
- Hut 11 at Bletchley ParkGrade II
- Hut 11A at Bletchley ParkGrade II
- Hut 3 at Bletchley ParkGrade II
- Hut 4 at Bletchley ParkGrade II
- Hut 6 at Bletchley ParkGrade II
- Hut 8 at Bletchley ParkGrade II
- Old Bletchley War MemorialGrade II
- Stable Block to Rectory the RectoryGrade II
- The Bungalow and attached wall to east and stable range to the southGrade II
The council’s appraisal
WEBBletchley Conservation Area AppraisalMilton Keynes City Council’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 Milton Keynes City Council and Historic England via planning.data.gov.uk (OGL). Guidance only — not an official council check.