Solar panels, heat pumps and insulation in South Kilburn conservation area
In the South Kilburn conservation area (Brent), 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 Brent covers part of this area (about 3% of it) but deals with other things (such as changes of use); it does not change the rules below. The area has 14 listed buildings; on a listed building solar panels and heat pumps are not permitted development at all and need planning permission and listed building consent. 317 homes inside the boundary have an energy certificate: 85.8% are solid-wall homes with no wall insulation, 92.7% heat with a gas boiler and 46.7% are rated D–G; 1 has 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
317homes with an energy certificate
85.8%solid walls, no insulation
92.7%heated by a gas boiler
1heat pumps
Article 4: An Article 4 direction published by Brent covers part of this area (about 3% of it) but deals with other things (such as changes of use); it does not change the rules below. (Article 4 for Town Centres - Kilburn)
What needs planning permission in South Kilburn
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
No permission needed (permitted development)
Part 1 Class A, A.3(a)
Listed buildings: 14 in the area. The table is for houses that are not listed: on a listed building, solar panels and air source heat pumps are not permitted development at all (they need planning permission), and any of these works needs listed building consent.
Flats: 97% 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 = 317)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
272
85.8%
Modern wall (U-value from the design)
11
3.5%
Cavity wall, unfilled
8
2.5%
Cavity wall, insulated (as built or unspecified)
7
2.2%
Solid wall, internal insulation
6
1.9%
Solid wall, partly insulated
4
1.3%
Timber frame
4
1.3%
Solid wall, insulated
2
0.6%
Cavity wall, filled
1
0.3%
Cavity wall, partly insulated
1
0.3%
Other or not known
1
0.3%
Heating
Homes
Share
Gas boiler
294
92.7%
Communal heating
14
4.4%
Electric (storage heaters, panels, boiler)
8
2.5%
Heat pump
1
0.3%
Loft / roof insulation
Homes
Share
No insulation
29
9.1%
Under 200 mm
35
11.0%
200 mm or more
23
7.3%
Insulated (depth not recorded)
11
3.5%
Flat or other home above
216
68.1%
Other
3
0.9%
Windows
Homes
Share
Double glazed
115
36.3%
Secondary glazing
108
34.1%
Single glazed
94
29.7%
CD
Energy rating: B 13 (4.1%) · C 156 (49.2%) · D 134 (42.3%) · E 12 (3.8%) · F 1 (0.3%) · G 1 (0.3%). Houses and bungalows: 3% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 February 1979.
Compared with Brent and England
Share of homes
South Kilburn
All 23 areas in Brent
England
Solid walls, no insulation
85.8%
77.8%
48.7%
Gas boiler
92.7%
85.7%
66.4%
Rated D–G
46.7%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 66% of these are from 2020 or later (latest 30 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 Brent if in doubt.
Boundary: London Borough of Brent via planning.data.gov.uk (entity 44014812, reference CA18, 6.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.