Solar panels, heat pumps and insulation in Northdown Road conservation area
In the Northdown Road conservation area (Thanet), 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 Thanet covers this area, but the published data does not say which rights it removes — check the direction before any work. The area has 2 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. 490 homes inside the boundary have an energy certificate: 75.9% are solid-wall homes with no wall insulation, 68.6% heat with a gas boiler and 71.6% are rated D–G; 0 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
490homes with an energy certificate
75.9%solid walls, no insulation
68.6%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Thanet covers this area, but the published data does not say which rights it removes — check the direction before any work. (Cliftonville ED; Margate ED)
What needs planning permission in Northdown Road
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: 2 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: 86% 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 = 490)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
372
75.9%
Solid wall, internal insulation
39
8.0%
Cavity wall, insulated (as built or unspecified)
27
5.5%
Timber frame
17
3.5%
Cavity wall, unfilled
12
2.4%
Modern wall (U-value from the design)
7
1.4%
Solid wall, insulated
7
1.4%
Solid wall, partly insulated
7
1.4%
Cavity wall, internal or external insulation
1
0.2%
Other or not known
1
0.2%
Heating
Homes
Share
Gas boiler
336
68.6%
Electric (storage heaters, panels, boiler)
150
30.6%
Communal heating
4
0.8%
Loft / roof insulation
Homes
Share
No insulation
91
18.6%
Under 200 mm
81
16.5%
200 mm or more
54
11.0%
Insulated (depth not recorded)
45
9.2%
Flat or other home above
212
43.3%
Other
7
1.4%
Windows
Homes
Share
Double glazed
415
84.7%
Single glazed
71
14.5%
Secondary glazing
4
0.8%
CDE
Energy rating: B 13 (2.7%) · C 126 (25.7%) · D 208 (42.4%) · E 124 (25.3%) · F 14 (2.9%) · G 5 (1.0%). Houses and bungalows: 14% of the homes; solar panels on 0.8% of the certificates. Most common build period on the certificates: 1900-1929.
Compared with Thanet and England
Share of homes
Northdown Road
All 27 areas in Thanet
England
Solid walls, no insulation
75.9%
59.4%
48.7%
Gas boiler
68.6%
72.8%
66.4%
Rated D–G
71.6%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 60% 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 Thanet if in doubt.
Boundary: Thanet District Council via planning.data.gov.uk (entity 44014885, reference 27, 10.5 ha). Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.