Solar panels, heat pumps and insulation in Nevern Square conservation area
In the Nevern Square conservation area (Kensington and Chelsea), 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 Kensington and Chelsea 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. 1,390 homes inside the boundary have an energy certificate: 89.0% are solid-wall homes with no wall insulation, 63.2% heat with a gas boiler and 46.4% are rated D–G; 33 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
1,390homes with an energy certificate
89.0%solid walls, no insulation
63.2%heated by a gas boiler
33heat pumps
Article 4: An Article 4 direction published by Kensington and Chelsea 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. (Article 4 - No 100; Article 4 - No 106; Article 4 - No 76)
What needs planning permission in Nevern Square
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: 98% 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 = 1,390)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
1,237
89.0%
Timber frame
54
3.9%
Solid wall, internal insulation
32
2.3%
Modern wall (U-value from the design)
19
1.4%
Other or not known
15
1.1%
Solid wall, insulated
13
0.9%
Solid wall, partly insulated
11
0.8%
Cavity wall, insulated (as built or unspecified)
5
0.4%
Cavity wall, unfilled
4
0.3%
Heating
Homes
Share
Gas boiler
879
63.2%
Electric (storage heaters, panels, boiler)
253
18.2%
Communal heating
225
16.2%
Heat pump
33
2.4%
Loft / roof insulation
Homes
Share
No insulation
196
14.1%
Under 200 mm
9
0.6%
200 mm or more
6
0.4%
Insulated (depth not recorded)
64
4.6%
Flat or other home above
1,101
79.2%
Other
14
1.0%
Windows
Homes
Share
Single glazed
646
46.5%
Double glazed
543
39.1%
Secondary glazing
196
14.1%
Triple glazed
5
0.4%
CDE
Energy rating: B 22 (1.6%) · C 723 (52.0%) · D 481 (34.6%) · E 122 (8.8%) · F 33 (2.4%) · G 9 (0.6%). Houses and bungalows: 2% of the homes; solar panels on 0.1% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 January 1985.
Compared with Kensington and Chelsea and England
Share of homes
Nevern Square
All 44 areas in Kensington and Chelsea
England
Solid walls, no insulation
89.0%
79.7%
48.7%
Gas boiler
63.2%
72.9%
66.4%
Rated D–G
46.4%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 56% of these are from 2020 or later (latest 31 October 2026). “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 Kensington and Chelsea if in doubt.
Boundary: Royal Borough of Kensington and Chelsea via planning.data.gov.uk (entity 44012775, reference 17, 9.9 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.