Solar panels, heat pumps and insulation in Sedgefield conservation area
In the Sedgefield conservation area (Durham), 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 25 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. 182 homes inside the boundary have an energy certificate: 61.0% are solid-wall homes with no wall insulation, 91.8% heat with a gas boiler and 74.2% are rated D–G; 1 has 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
182homes with an energy certificate
61.0%solid walls, no insulation
91.8%heated by a gas boiler
1heat pumps
Article 4: Durham does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Sedgefield
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: 25 in the area (grade I: 1, II*: 1). 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: 15% 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 = 182)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
111
61.0%
Cavity wall, filled
28
15.4%
Cavity wall, insulated (as built or unspecified)
19
10.4%
Cavity wall, unfilled
12
6.6%
Solid wall, internal insulation
6
3.3%
Modern wall (U-value from the design)
2
1.1%
Solid wall, external insulation
2
1.1%
Solid wall, insulated
1
0.5%
Solid wall, partly insulated
1
0.5%
Heating
Homes
Share
Gas boiler
167
91.8%
Electric (storage heaters, panels, boiler)
7
3.8%
Oil
3
1.6%
Solid fuel (wood, coal)
3
1.6%
Communal heating
1
0.5%
Heat pump
1
0.5%
Loft / roof insulation
Homes
Share
No insulation
46
25.3%
Under 200 mm
26
14.3%
200 mm or more
75
41.2%
Insulated (depth not recorded)
23
12.6%
Flat or other home above
10
5.5%
Other
2
1.1%
Windows
Homes
Share
Double glazed
164
90.1%
Single glazed
15
8.2%
Secondary glazing
3
1.6%
CDE
Energy rating: B 2 (1.1%) · C 45 (24.7%) · D 80 (44.0%) · E 39 (21.4%) · F 13 (7.1%) · G 3 (1.6%). Houses and bungalows: 85% of the homes; solar panels on 0.5% of the certificates. Most common build period on the certificates: before 1900. Designated: 5 May 1971.
Compared with Durham and England
Share of homes
Sedgefield
All 93 areas in Durham
England
Solid walls, no insulation
61.0%
47.6%
48.7%
Gas boiler
91.8%
72.9%
66.4%
Rated D–G
74.2%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 45% of these are from 2020 or later (latest 7 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 Durham if in doubt.
Boundary: Durham County Council via planning.data.gov.uk (entity 44006439, reference 6138, 17.9 ha). Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.