Solar panels, heat pumps and insulation in Thorne - Central conservation area
In the Thorne - Central conservation area (Doncaster), 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 14 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. 397 homes inside the boundary have an energy certificate: 25.4% are solid-wall homes with no wall insulation, 74.8% heat with a gas boiler and 31.7% 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
397homes with an energy certificate
25.4%solid walls, no insulation
74.8%heated by a gas boiler
0heat pumps
Article 4: Doncaster 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 Thorne - Central
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: 14 in the area (grade I: 1, II*: 0). 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: 72% 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 = 397)
Walls
Homes
Share
Cavity wall, insulated (as built or unspecified)
124
31.2%
Modern wall (U-value from the design)
107
27.0%
Solid wall (brick or stone), no insulation
101
25.4%
Cavity wall, filled
30
7.6%
Cavity wall, unfilled
10
2.5%
Timber frame
8
2.0%
Solid wall, insulated
6
1.5%
Solid wall, internal insulation
5
1.3%
Cavity wall, internal or external insulation
2
0.5%
Other or not known
2
0.5%
Cavity wall, partly insulated
1
0.3%
Solid wall, partly insulated
1
0.3%
Heating
Homes
Share
Gas boiler
297
74.8%
Electric (storage heaters, panels, boiler)
69
17.4%
Communal heating
31
7.8%
Loft / roof insulation
Homes
Share
No insulation
23
5.8%
Under 200 mm
38
9.6%
200 mm or more
99
24.9%
Insulated (depth not recorded)
46
11.6%
Flat or other home above
120
30.2%
Other
71
17.9%
Windows
Homes
Share
Double glazed
371
93.5%
Single glazed
22
5.5%
Secondary glazing
3
0.8%
Other
1
0.3%
BCDE
Energy rating: B 110 (27.7%) · C 161 (40.6%) · D 79 (19.9%) · E 39 (9.8%) · F 6 (1.5%) · G 2 (0.5%). Houses and bungalows: 28% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: 2007-2011. Designated: 1 January 1968.
Compared with Doncaster and England
Share of homes
Thorne - Central
All 38 areas in Doncaster
England
Solid walls, no insulation
25.4%
39.4%
48.7%
Gas boiler
74.8%
75.4%
66.4%
Rated D–G
31.7%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 49% of these are from 2020 or later (latest 4 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 Doncaster if in doubt.
Boundary: Doncaster Metropolitan Borough Council via planning.data.gov.uk (entity 44009930, reference 44, 37.3 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.