Solar panels, heat pumps and insulation in Fish Island conservation area
In the Fish Island conservation area (Tower Hamlets), 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. 245 homes inside the boundary have an energy certificate: 24.5% are solid-wall homes with no wall insulation, 24.5% heat with a gas boiler and 8.2% are rated D–G; 3 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
245homes with an energy certificate
24.5%solid walls, no insulation
24.5%heated by a gas boiler
3heat pumps
Article 4: Tower Hamlets publishes its Article 4 areas on planning.data.gov.uk and none overlaps this area; a direction can still exist on paper, so check with the council.
What needs planning permission in Fish Island
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: 99% 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 = 245)
Walls
Homes
Share
Modern wall (U-value from the design)
112
45.7%
Other or not known
63
25.7%
Solid wall (brick or stone), no insulation
60
24.5%
Cavity wall, insulated (as built or unspecified)
4
1.6%
Solid wall, insulated
2
0.8%
Solid wall, internal insulation
2
0.8%
Cavity wall, unfilled
1
0.4%
Timber frame
1
0.4%
Heating
Homes
Share
Electric (storage heaters, panels, boiler)
98
40.0%
Communal heating
83
33.9%
Gas boiler
60
24.5%
Heat pump
3
1.2%
Other
1
0.4%
Loft / roof insulation
Homes
Share
No insulation
2
0.8%
Insulated (depth not recorded)
17
6.9%
Flat or other home above
196
80.0%
Other
30
12.2%
Windows
Homes
Share
Double glazed
243
99.2%
Other
1
0.4%
Single glazed
1
0.4%
BC
Energy rating: B 123 (50.2%) · C 102 (41.6%) · D 11 (4.5%) · E 9 (3.7%). Houses and bungalows: 1% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: 2021.
Compared with Tower Hamlets and England
Share of homes
Fish Island
All 61 areas in Tower Hamlets
England
Solid walls, no insulation
24.5%
41.8%
48.7%
Gas boiler
24.5%
61.1%
66.4%
Rated D–G
8.2%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 85% of these are from 2020 or later (latest 17 September 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 Tower Hamlets if in doubt.
Boundary: London Borough of Tower Hamlets via planning.data.gov.uk (entity 44006543, reference TH-55-FIS, 11.2 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.