Solar panels, heat pumps and insulation in Folkestone conservation area
In the Folkestone conservation area (Folkestone and Hythe), 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 95 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. 3,165 homes inside the boundary have an energy certificate: 43.2% are solid-wall homes with no wall insulation, 69.2% heat with a gas boiler and 46.5% are rated D–G; 6 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
3,165homes with an energy certificate
43.2%solid walls, no insulation
69.2%heated by a gas boiler
6heat pumps
Article 4: Folkestone and Hythe does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Folkestone
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: 95 in the area (grade I: 0, II*: 5). 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: 95% 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 = 3,165)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
1,366
43.2%
Cavity wall, unfilled
646
20.4%
Cavity wall, insulated (as built or unspecified)
387
12.2%
Timber frame
209
6.6%
Modern wall (U-value from the design)
134
4.2%
Cavity wall, filled
98
3.1%
Other or not known
77
2.4%
Solid wall, internal insulation
67
2.1%
Solid wall, insulated
60
1.9%
Cavity wall, partly insulated
54
1.7%
Solid wall, partly insulated
47
1.5%
Cavity wall, internal or external insulation
13
0.4%
Solid wall, external insulation
7
0.2%
Heating
Homes
Share
Gas boiler
2,190
69.2%
Electric (storage heaters, panels, boiler)
905
28.6%
Communal heating
60
1.9%
Heat pump
6
0.2%
Oil
2
0.1%
LPG
1
0.0%
Other
1
0.0%
Loft / roof insulation
Homes
Share
No insulation
326
10.3%
Under 200 mm
196
6.2%
200 mm or more
221
7.0%
Insulated (depth not recorded)
206
6.5%
Flat or other home above
2,127
67.2%
Other
89
2.8%
Windows
Homes
Share
Double glazed
2,416
76.3%
Single glazed
634
20.0%
Secondary glazing
111
3.5%
Triple glazed
4
0.1%
CDE
Energy rating: B 226 (7.1%) · C 1,468 (46.4%) · D 1,041 (32.9%) · E 363 (11.5%) · F 43 (1.4%) · G 24 (0.8%). Houses and bungalows: 5% of the homes; solar panels on 0.1% of the certificates. Most common build period on the certificates: before 1900. Designated: 28 January 1972.
Compared with Folkestone and Hythe and England
Share of homes
Folkestone
All 21 areas in Folkestone and Hythe
England
Solid walls, no insulation
43.2%
40.8%
48.7%
Gas boiler
69.2%
69.0%
66.4%
Rated D–G
46.5%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 54% of these are from 2020 or later (latest 31 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 Folkestone and Hythe if in doubt.
Boundary: Folkestone and Hythe Council via planning.data.gov.uk (entity 44007333, reference 5975, 84.2 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.