Solar panels, heat pumps and insulation in Wellington Square conservation area
In the Wellington Square conservation area (Somerset), 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. The area has 40 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. 709 homes inside the boundary have an energy certificate: 64.6% are solid-wall homes with no wall insulation, 61.1% heat with a gas boiler and 74.5% 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
709homes with an energy certificate
64.6%solid walls, no insulation
61.1%heated by a gas boiler
0heat pumps
Article 4: Somerset does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Wellington Square
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: 40 in the area (grade I: 0, II*: 4). 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: 69% 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 = 709)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
458
64.6%
Modern wall (U-value from the design)
56
7.9%
Timber frame
51
7.2%
Cavity wall, insulated (as built or unspecified)
42
5.9%
Cavity wall, unfilled
40
5.6%
Solid wall, internal insulation
20
2.8%
Cavity wall, filled
16
2.3%
Solid wall, insulated
15
2.1%
Other or not known
6
0.8%
Cavity wall, partly insulated
3
0.4%
Cavity wall, internal or external insulation
1
0.1%
Solid wall, partly insulated
1
0.1%
Heating
Homes
Share
Gas boiler
433
61.1%
Electric (storage heaters, panels, boiler)
264
37.2%
Communal heating
11
1.6%
LPG
1
0.1%
Loft / roof insulation
Homes
Share
No insulation
86
12.1%
Under 200 mm
150
21.2%
200 mm or more
122
17.2%
Insulated (depth not recorded)
70
9.9%
Flat or other home above
237
33.4%
Other
44
6.2%
Windows
Homes
Share
Double glazed
555
78.3%
Single glazed
120
16.9%
Secondary glazing
32
4.5%
Triple glazed
2
0.3%
CDE
Energy rating: A 5 (0.7%) · B 12 (1.7%) · C 164 (23.1%) · D 301 (42.5%) · E 192 (27.1%) · F 30 (4.2%) · G 5 (0.7%). Houses and bungalows: 31% of the homes; solar panels on 0.4% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 January 1975.
Compared with Somerset and England
Share of homes
Wellington Square
All 178 areas in Somerset
England
Solid walls, no insulation
64.6%
57.3%
48.7%
Gas boiler
61.1%
61.6%
66.4%
Rated D–G
74.5%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 58% of these are from 2020 or later (latest 18 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 Somerset if in doubt.
Boundary: Somerset Council via planning.data.gov.uk (entity 44007132, reference 7871, 32.6 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.