Solar panels, heat pumps and insulation in Cockermouth conservation area
In the Cockermouth conservation area (Cumberland), 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 100 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. 1,160 homes inside the boundary have an energy certificate: 48.8% are solid-wall homes with no wall insulation, 73.4% heat with a gas boiler and 59.4% 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
1,160homes with an energy certificate
48.8%solid walls, no insulation
73.4%heated by a gas boiler
3heat pumps
Article 4: Cumberland does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Cockermouth
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: 100 in the area (grade I: 7, II*: 7). 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: 45% 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 = 1,160)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
566
48.8%
Cavity wall, insulated (as built or unspecified)
218
18.8%
Cavity wall, filled
72
6.2%
Modern wall (U-value from the design)
68
5.9%
Cavity wall, unfilled
67
5.8%
Solid wall, internal insulation
49
4.2%
Solid wall, insulated
38
3.3%
Timber frame
32
2.8%
Cavity wall, partly insulated
23
2.0%
Cavity wall, internal or external insulation
13
1.1%
Other or not known
12
1.0%
Solid wall, partly insulated
2
0.2%
Heating
Homes
Share
Gas boiler
852
73.4%
Electric (storage heaters, panels, boiler)
259
22.3%
Communal heating
38
3.3%
Oil
4
0.3%
Heat pump
3
0.3%
LPG
2
0.2%
Solid fuel (wood, coal)
2
0.2%
Loft / roof insulation
Homes
Share
No insulation
156
13.4%
Under 200 mm
200
17.2%
200 mm or more
349
30.1%
Insulated (depth not recorded)
132
11.4%
Flat or other home above
270
23.3%
Other
53
4.6%
Windows
Homes
Share
Double glazed
928
80.0%
Single glazed
182
15.7%
Secondary glazing
37
3.2%
Triple glazed
13
1.1%
CDE
Energy rating: A 1 (0.1%) · B 63 (5.4%) · C 407 (35.1%) · D 454 (39.1%) · E 194 (16.7%) · F 34 (2.9%) · G 7 (0.6%). Houses and bungalows: 55% of the homes; solar panels on 0.3% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 January 1975.
Compared with Cumberland and England
Share of homes
Cockermouth
All 51 areas in Cumberland
England
Solid walls, no insulation
48.8%
52.9%
48.7%
Gas boiler
73.4%
74.7%
66.4%
Rated D–G
59.4%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 46% of these are from 2020 or later (latest 24 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 Cumberland if in doubt.
Boundary: Cumberland Council via planning.data.gov.uk (entity 44005028, reference 8380, 140.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.