Solar panels, heat pumps and insulation in Vauxhall conservation area
In the Vauxhall conservation area (Lambeth), 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 Lambeth covers part of this area (about 16% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 35 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. 949 homes inside the boundary have an energy certificate: 57.2% are solid-wall homes with no wall insulation, 68.7% heat with a gas boiler and 40.7% are rated D–G; 2 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
949homes with an energy certificate
57.2%solid walls, no insulation
68.7%heated by a gas boiler
2heat pumps
Article 4: An Article 4 direction published by Lambeth covers part of this area (about 16% of it), but the published data does not say which rights it removes — check the direction before any work. (Modified Direction 1 - CAZ; ST MARKS)
What needs planning permission in Vauxhall
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), unless an Article 4 direction removes it — check with the council
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), unless an Article 4 direction removes it — check with the council
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)
Prior approval of appearance from the council, unless an Article 4 direction removes it — check with the council
Replacement windows and doors of similar appearance
No permission needed (permitted development), unless an Article 4 direction removes it — check with the council
Part 1 Class A, A.3(a)
Listed buildings: 35 in the area (grade I: 0, II*: 3). 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: 88% 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 = 949)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
543
57.2%
Modern wall (U-value from the design)
152
16.0%
Cavity wall, insulated (as built or unspecified)
124
13.1%
Other or not known
37
3.9%
Timber frame
27
2.8%
Solid wall, insulated
26
2.7%
Solid wall, internal insulation
17
1.8%
Cavity wall, partly insulated
10
1.1%
Cavity wall, filled
6
0.6%
Solid wall, partly insulated
4
0.4%
Cavity wall, unfilled
2
0.2%
Solid wall, external insulation
1
0.1%
Heating
Homes
Share
Gas boiler
652
68.7%
Communal heating
147
15.5%
Electric (storage heaters, panels, boiler)
147
15.5%
Heat pump
2
0.2%
LPG
1
0.1%
Loft / roof insulation
Homes
Share
No insulation
111
11.7%
Under 200 mm
74
7.8%
200 mm or more
54
5.7%
Insulated (depth not recorded)
81
8.5%
Flat or other home above
511
53.8%
Other
118
12.4%
Windows
Homes
Share
Double glazed
697
73.5%
Single glazed
179
18.9%
Secondary glazing
69
7.3%
Triple glazed
3
0.3%
BCD
Energy rating: A 4 (0.4%) · B 104 (11.0%) · C 455 (47.9%) · D 306 (32.2%) · E 71 (7.5%) · F 6 (0.6%) · G 3 (0.3%). Houses and bungalows: 12% of the homes; solar panels on 0.1% of the certificates. Most common build period on the certificates: 1900-1929. Designated: 8 June 1981.
Compared with Lambeth and England
Share of homes
Vauxhall
All 65 areas in Lambeth
England
Solid walls, no insulation
57.2%
64.5%
48.7%
Gas boiler
68.7%
73.7%
66.4%
Rated D–G
40.7%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 50% 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 Lambeth if in doubt.
Boundary: London Borough of Lambeth via planning.data.gov.uk (entity 44008839, reference CA32, 25.7 ha). Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.