Solar panels, heat pumps and insulation in Old Barge House Alley conservation area
In the Old Barge House Alley conservation area (Southwark), 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 Southwark covers this area, but the published data does not say which rights it removes — check the direction before any work. 78 homes inside the boundary have an energy certificate: 36% are solid-wall homes with no wall insulation, 0% heat with a gas boiler and 31% 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
78homes with an energy certificate
36%solid walls, no insulation
0%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Southwark covers this area, but the published data does not say which rights it removes — check the direction before any work. (Bankside and Borough District Town Centre; Central Activities Zone)
What needs planning permission in Old Barge House Alley
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: 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 = 78)
Walls
Homes
Share
Cavity wall, insulated (as built or unspecified)
34
44%
Solid wall (brick or stone), no insulation
28
36%
Solid wall, insulated
5
6%
Cavity wall, unfilled
4
5%
Other or not known
4
5%
Solid wall, external insulation
3
4%
Heating
Homes
Share
Electric (storage heaters, panels, boiler)
78
100%
Loft / roof insulation
Homes
Share
Insulated (depth not recorded)
2
3%
Flat or other home above
76
97%
Windows
Homes
Share
Double glazed
77
99%
Single glazed
1
1%
BCD
Energy rating: B 11 (14%) · C 43 (55%) · D 20 (26%) · E 4 (5%). Houses and bungalows: 0% of the homes; solar panels on 0% of the certificates. Most common build period on the certificates: 1983-1990. Designated: 21 February 1983.
Compared with Southwark and England
Share of homes
Old Barge House Alley
All 56 areas in Southwark
England
Solid walls, no insulation
36%
56.7%
48.7%
Gas boiler
0%
71.3%
66.4%
Rated D–G
31%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 96% of these are from 2020 or later (latest 16 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 Southwark if in doubt.
Boundary: London Borough of Southwark via planning.data.gov.uk (entity 44010237, reference 23, 0.9 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.