Solar panels, heat pumps and insulation in The PETHAM conservation area
In the The PETHAM conservation area (Canterbury), 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. An Article 4 direction published by Canterbury covers part of this area (about 0% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 20 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. 89 homes inside the boundary have an energy certificate: 25% are solid-wall homes with no wall insulation, 4% heat with a gas boiler and 82% 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
89homes with an energy certificate
25%solid walls, no insulation
4%heated by a gas boiler
6heat pumps
Article 4: An Article 4 direction published by Canterbury covers part of this area (about 0% of it), but the published data does not say which rights it removes — check the direction before any work. (BROADWAY LODGE, THE BROADWAY, PETHAM; SWEET AUBURN COTTAGE, CHURCH LANE, PETHAM; YEW TREE HOUSE, THE STREET, PETHAM)
What needs planning permission in The PETHAM
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: 20 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 = 89)
Walls
Homes
Share
Cavity wall, filled
38
43%
Solid wall (brick or stone), no insulation
22
25%
Cavity wall, unfilled
10
11%
Modern wall (U-value from the design)
8
9%
Timber frame
8
9%
Solid wall, internal insulation
2
2%
Cavity wall, insulated (as built or unspecified)
1
1%
Heating
Homes
Share
Oil
43
48%
Electric (storage heaters, panels, boiler)
26
29%
Heat pump
6
7%
LPG
6
7%
Gas boiler
4
4%
Solid fuel (wood, coal)
4
4%
Loft / roof insulation
Homes
Share
No insulation
12
13%
Under 200 mm
28
31%
200 mm or more
21
24%
Insulated (depth not recorded)
12
13%
Flat or other home above
7
8%
Other
9
10%
Windows
Homes
Share
Double glazed
74
83%
Single glazed
9
10%
Secondary glazing
5
6%
Triple glazed
1
1%
CDEF
Energy rating: A 1 (1%) · B 5 (6%) · C 10 (11%) · D 22 (25%) · E 34 (38%) · F 14 (16%) · G 3 (3%). Houses and bungalows: 85% of the homes; solar panels on 1% of the certificates. Most common build period on the certificates: before 1900. Designated: 16 August 1994.
Compared with Canterbury and England
Share of homes
The PETHAM
All 98 areas in Canterbury
England
Solid walls, no insulation
25%
36.5%
48.7%
Gas boiler
4%
73.7%
66.4%
Rated D–G
82%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 53% of these are from 2020 or later (latest 3 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 Canterbury if in doubt.
Boundary: Canterbury City Council via planning.data.gov.uk (entity 44010011, reference 126, 82.9 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.