Solar panels, heat pumps and insulation in Okehampton conservation area
In the Okehampton conservation area (West Devon), 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 23 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. 688 homes inside the boundary have an energy certificate: 43.6% are solid-wall homes with no wall insulation, 54.9% heat with a gas boiler and 57.0% 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
688homes with an energy certificate
43.6%solid walls, no insulation
54.9%heated by a gas boiler
1heat pumps
Article 4: West Devon does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Okehampton
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: 23 in the area (grade I: 0, II*: 3). 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: 61% 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 = 688)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
300
43.6%
Cavity wall, insulated (as built or unspecified)
138
20.1%
Modern wall (U-value from the design)
61
8.9%
Cavity wall, filled
54
7.8%
Cavity wall, unfilled
44
6.4%
Solid wall, internal insulation
21
3.1%
Timber frame
21
3.1%
Cavity wall, partly insulated
19
2.8%
Solid wall, insulated
18
2.6%
Other or not known
9
1.3%
Cavity wall, internal or external insulation
2
0.3%
Solid wall, partly insulated
1
0.1%
Heating
Homes
Share
Gas boiler
378
54.9%
Electric (storage heaters, panels, boiler)
235
34.2%
Communal heating
69
10.0%
Oil
3
0.4%
Heat pump
1
0.1%
LPG
1
0.1%
Solid fuel (wood, coal)
1
0.1%
Loft / roof insulation
Homes
Share
No insulation
82
11.9%
Under 200 mm
92
13.4%
200 mm or more
171
24.9%
Insulated (depth not recorded)
80
11.6%
Flat or other home above
223
32.4%
Other
40
5.8%
Windows
Homes
Share
Double glazed
639
92.9%
Single glazed
35
5.1%
Secondary glazing
14
2.0%
BCDE
Energy rating: A 1 (0.1%) · B 99 (14.4%) · C 196 (28.5%) · D 227 (33.0%) · E 124 (18.0%) · F 29 (4.2%) · G 12 (1.7%). Houses and bungalows: 39% of the homes; solar panels on 1.6% of the certificates. Most common build period on the certificates: before 1900. Designated: 6 June 1990.
Compared with West Devon and England
Share of homes
Okehampton
All 24 areas in West Devon
England
Solid walls, no insulation
43.6%
55.3%
48.7%
Gas boiler
54.9%
54.8%
66.4%
Rated D–G
57.0%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 56% of these are from 2020 or later (latest 25 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 West Devon if in doubt.
Boundary: West Devon Borough Council via planning.data.gov.uk (entity 44001184, reference 2806, 50.9 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.