Solar panels, heat pumps and insulation in Sudbury Court conservation area
In the Sudbury Court 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 this area and removes permitted development rights for painting the outside, so there these need planning permission too. 401 homes inside the boundary have an energy certificate: 93.8% are solid-wall homes with no wall insulation, 96.8% heat with a gas boiler and 82.8% 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
401homes with an energy certificate
93.8%solid walls, no insulation
96.8%heated by a gas boiler
1heat pumps
Article 4: An Article 4 direction published by Brent covers this area and removes permitted development rights for painting the outside, so there these need planning permission too. (Article 4 for HMOs; Sudbury Court)
What needs planning permission in Sudbury Court
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: none recorded inside the boundary; on a listed building, solar panels and heat pumps are not permitted development and need listed building consent.
Flats: 8% 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 = 401)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
376
93.8%
Cavity wall, unfilled
9
2.2%
Cavity wall, insulated (as built or unspecified)
6
1.5%
Solid wall, internal insulation
4
1.0%
Modern wall (U-value from the design)
2
0.5%
Cavity wall, filled
1
0.2%
Cavity wall, internal or external insulation
1
0.2%
Solid wall, insulated
1
0.2%
Timber frame
1
0.2%
Heating
Homes
Share
Gas boiler
388
96.8%
Electric (storage heaters, panels, boiler)
10
2.5%
Oil
2
0.5%
Heat pump
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
97
24.2%
Under 200 mm
141
35.2%
200 mm or more
111
27.7%
Insulated (depth not recorded)
39
9.7%
Flat or other home above
11
2.7%
Other
2
0.5%
Windows
Homes
Share
Double glazed
385
96.0%
Single glazed
13
3.2%
Secondary glazing
2
0.5%
Triple glazed
1
0.2%
CDE
Energy rating: B 2 (0.5%) · C 67 (16.7%) · D 217 (54.1%) · E 101 (25.2%) · F 11 (2.7%) · G 3 (0.7%). Houses and bungalows: 92% of the homes; solar panels on 0.7% of the certificates. Most common build period on the certificates: 1930-1949. Designated: 1 January 1990.
Compared with Brent and England
Share of homes
Sudbury Court
All 23 areas in Brent
England
Solid walls, no insulation
93.8%
77.8%
48.7%
Gas boiler
96.8%
85.7%
66.4%
Rated D–G
82.8%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 49% of these are from 2020 or later (latest 26 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 44014804, reference CA20, 44.4 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.