Solar panels, heat pumps and insulation in Botwell: Nestles conservation area
In the Botwell: Nestles conservation area (Hillingdon), external wall insulation needs planning permission, and so does an air source heat pump on a wall or roof facing the road; one at the back or side, internal and loft insulation and solar panels on a roof slope normally do not. An Article 4 direction published by Hillingdon covers this area and removes permitted development rights for replacement windows and doors, and other alterations to the house, so there these need planning permission too. 1,204 homes inside the boundary have an energy certificate: 0.0% are solid-wall homes with no wall insulation, 0.0% heat with a gas boiler and 0.0% are rated D–G; 0 have a heat pump. EPC register November 2026; rules as at 21 October 2026.
Data: EPC register November 2026 (latest certificate per home), conservation area boundaries 3 November 2026, permitted development rules as at 21 October 2026 · calculated 5 November 2026 · Methodology and sources
1,204homes with an energy certificate
0.0%solid walls, no insulation
0.0%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Hillingdon covers this area and removes permitted development rights for replacement windows and doors, and other alterations to the house, so there these need planning permission too. (Changes of use from commercial, business and service uses to dwellinghouses; Construction of new dwellinghouses in employment areas; Residential extensions)
What needs planning permission in Botwell: Nestles
Work (house, not listed)
In a conservation area
Rule
Air source heat pump on a wall or roof facing the road, or nearer the road than the house
Planning permission needed
Part 14 Class G, G.1(j)
Air source heat pump at the back or side (outdoor unit up to 1.5 m³, MCS Planning Standards, one per house — two on a detached house)
No permission needed (permitted development)
Part 14 Class G
Solar panels on a pitched roof (up to 0.2 m proud, not above the ridge)
No permission needed (permitted development)
Part 14 Class A, A.2(c)
Solar panels on a wall, balcony or roof enclosure facing the road
Planning permission needed
Part 14 Class A, A.2(e)
Solar panels on a flat roof (up to 0.6 m above the roof)
Replacement windows and doors of similar appearance
Planning permission needed (an Article 4 direction here removes this right)
Part 1 Class A, A.3(a)
Listed buildings: none recorded inside the boundary; on a listed building, solar panels and heat pumps are not permitted development and need listed building consent.
Flats: 100% of the certified homes here are flats or maisonettes. Homes in a block of flats have no householder rights for alterations; heat pumps and solar have their own, tighter rules for blocks of flats.
The homes in the area (latest certificate per home, n = 1,204)
Walls
Homes
Share
Modern wall (U-value from the design)
1,204
100.0%
Heating
Homes
Share
Communal heating
1,204
100.0%
Loft / roof insulation
Homes
Share
Flat or other home above
956
79.4%
Other
248
20.6%
Windows
Homes
Share
Double glazed
1,204
100.0%
B
Energy rating: B 1,199 (99.6%) · C 5 (0.4%). Houses and bungalows: 0% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: 2025. Designated: 20 June 1988.
Compared with Hillingdon and England
Share of homes
Botwell: Nestles
All 32 areas in Hillingdon
England
Solid walls, no insulation
0.0%
25.5%
48.7%
Gas boiler
0.0%
62.7%
66.4%
Rated D–G
0.0%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 100% of these are from 2020 or later (latest 9 October 2025). “No insulation (assumed)” is the assessor's default for older walls.
The rules are England's national permitted development rules (General Permitted Development Order 2015, Schedule 2, as at 21 October 2026). They do not cover building regulations or a council's own conditions. This is not a planning decision: ask Hillingdon if in doubt.
Boundary: London Borough of Hillingdon via planning.data.gov.uk (entity 44015538, reference CA-17, 12.3 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.