Solar panels, heat pumps and insulation in Harlow Garden Village Estate conservation area
In the Harlow Garden Village Estate conservation area (Harlow), 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 Harlow covers this area and removes permitted development rights for solar panels on the house, replacement windows and doors, and other alterations to the house, alterations to the roof (e.g. rooflights), chimneys, flues and soil pipes, painting the outside, so there these need planning permission too. 127 homes inside the boundary have an energy certificate: 59.8% are solid-wall homes with no wall insulation, 99.2% heat with a gas boiler and 70.9% 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
127homes with an energy certificate
59.8%solid walls, no insulation
99.2%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Harlow covers this area and removes permitted development rights for solar panels on the house, replacement windows and doors, and other alterations to the house, alterations to the roof (e.g. rooflights), chimneys, flues and soil pipes, painting the outside, so there these need planning permission too. (HMO - townwide; Old Harlow - St John's Avenue)
What needs planning permission in Harlow Garden Village Estate
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)
Planning permission needed (an Article 4 direction here removes this right)
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)
Planning permission needed (an Article 4 direction here removes this right)
Replacement windows and doors of similar appearance
Planning permission needed (an Article 4 direction here removes this right)
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: 17% 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 = 127)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
76
59.8%
Cavity wall, filled
18
14.2%
Solid wall, external insulation
15
11.8%
Cavity wall, insulated (as built or unspecified)
6
4.7%
Cavity wall, unfilled
5
3.9%
Modern wall (U-value from the design)
3
2.4%
Other or not known
3
2.4%
Cavity wall, partly insulated
1
0.8%
Heating
Homes
Share
Gas boiler
126
99.2%
Electric (storage heaters, panels, boiler)
1
0.8%
Loft / roof insulation
Homes
Share
No insulation
11
8.7%
Under 200 mm
41
32.3%
200 mm or more
53
41.7%
Insulated (depth not recorded)
8
6.3%
Flat or other home above
11
8.7%
Other
3
2.4%
Windows
Homes
Share
Double glazed
123
96.9%
Single glazed
3
2.4%
Secondary glazing
1
0.8%
CDE
Energy rating: B 2 (1.6%) · C 35 (27.6%) · D 76 (59.8%) · E 11 (8.7%) · F 3 (2.4%). Houses and bungalows: 83% of the homes; solar panels on 1.6% of the certificates. Most common build period on the certificates: 1930-1949. Designated: 1 December 2013.
Compared with Harlow and England
Share of homes
Harlow Garden Village Estate
All 10 areas in Harlow
England
Solid walls, no insulation
59.8%
26.1%
48.7%
Gas boiler
99.2%
83.5%
66.4%
Rated D–G
70.9%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 80% of these are from 2020 or later (latest 13 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 Harlow if in doubt.
Boundary: Harlow District Council via planning.data.gov.uk (entity 44015565, reference HAR_CA2, 7.7 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.