Solar panels, heat pumps and insulation in Windermere conservation area
In the Windermere conservation area (Lake District National Park Authority), 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 10 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. 641 homes inside the boundary have an energy certificate: 57.1% are solid-wall homes with no wall insulation, 73.3% heat with a gas boiler and 66.1% are rated D–G; 13 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
641homes with an energy certificate
57.1%solid walls, no insulation
73.3%heated by a gas boiler
13heat pumps
Article 4: Lake District National Park Authority 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 Windermere
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: 10 in the area. 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: 42% 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 = 641)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
366
57.1%
Cavity wall, insulated (as built or unspecified)
104
16.2%
Cavity wall, unfilled
41
6.4%
Solid wall, insulated
31
4.8%
Timber frame
27
4.2%
Modern wall (U-value from the design)
24
3.7%
Solid wall, internal insulation
23
3.6%
Cavity wall, filled
12
1.9%
Cavity wall, partly insulated
9
1.4%
Solid wall, partly insulated
3
0.5%
Other or not known
1
0.2%
Heating
Homes
Share
Gas boiler
470
73.3%
Electric (storage heaters, panels, boiler)
147
22.9%
Heat pump
13
2.0%
Communal heating
8
1.2%
LPG
2
0.3%
Solid fuel (wood, coal)
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
132
20.6%
Under 200 mm
87
13.6%
200 mm or more
146
22.8%
Insulated (depth not recorded)
107
16.7%
Flat or other home above
149
23.2%
Other
20
3.1%
Windows
Homes
Share
Double glazed
581
90.6%
Single glazed
45
7.0%
Secondary glazing
13
2.0%
Triple glazed
2
0.3%
CDE
Energy rating: A 1 (0.2%) · B 26 (4.1%) · C 190 (29.6%) · D 249 (38.8%) · E 135 (21.1%) · F 33 (5.1%) · G 7 (1.1%). Houses and bungalows: 58% of the homes; solar panels on 1.1% of the certificates. Most common build period on the certificates: before 1900. Designated: 26 October 2011.
Compared with Lake District National Park Authority and England
Share of homes
Windermere
All 23 areas in Lake District National Park Authority
England
Solid walls, no insulation
57.1%
61.4%
48.7%
Gas boiler
73.3%
64.8%
66.4%
Rated D–G
66.1%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 54% of these are from 2020 or later (latest 25 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 Lake District National Park Authority if in doubt.
Boundary: Lake District National Park Authority via planning.data.gov.uk (entity 44015626, reference CA23, 64.2 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.