Solar panels, heat pumps and insulation in Hadley Wood conservation area
In the Hadley Wood conservation area (Enfield), 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 Enfield covers this area, but the published data does not say which rights it removes — check the direction before any work. 70 homes inside the boundary have an energy certificate: 63% are solid-wall homes with no wall insulation, 99% heat with a gas boiler and 64% 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
70homes with an energy certificate
63%solid walls, no insulation
99%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Enfield covers this area, but the published data does not say which rights it removes — check the direction before any work. (Borough wide; Hadley Wood)
What needs planning permission in Hadley Wood
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: none recorded inside the boundary; on a listed building, solar panels and heat pumps are not permitted development and need listed building consent.
Flats: 31% 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 = 70)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
44
63%
Cavity wall, insulated (as built or unspecified)
10
14%
Modern wall (U-value from the design)
6
9%
Solid wall, partly insulated
3
4%
Timber frame
3
4%
Cavity wall, filled
1
1%
Cavity wall, partly insulated
1
1%
Solid wall, external insulation
1
1%
Solid wall, internal insulation
1
1%
Heating
Homes
Share
Gas boiler
69
99%
Communal heating
1
1%
Loft / roof insulation
Homes
Share
No insulation
18
26%
Under 200 mm
11
16%
200 mm or more
12
17%
Insulated (depth not recorded)
12
17%
Flat or other home above
11
16%
Other
6
9%
Windows
Homes
Share
Double glazed
54
77%
Single glazed
11
16%
Secondary glazing
5
7%
CDE
Energy rating: B 5 (7%) · C 20 (29%) · D 20 (29%) · E 21 (30%) · F 4 (6%). Houses and bungalows: 69% of the homes; solar panels on 0% of the certificates. Most common build period on the certificates: 1900-1929. Designated: 1 January 1989.
Compared with Enfield and England
Share of homes
Hadley Wood
All 24 areas in Enfield
England
Solid walls, no insulation
63%
53.5%
48.7%
Gas boiler
99%
81.0%
66.4%
Rated D–G
64%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 53% of these are from 2020 or later (latest 14 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 Enfield if in doubt.
Boundary: London Borough of Enfield via planning.data.gov.uk (entity 44010282, reference CA11, 13.4 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.