Solar panels, heat pumps and insulation in Chelmer and Blackwater Navigation conservation area
In the Chelmer and Blackwater Navigation conservation area (Maldon), 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 Maldon covers part of this area (about 8% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 39 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. 199 homes inside the boundary have an energy certificate: 8.5% are solid-wall homes with no wall insulation, 86.4% heat with a gas boiler and 22.1% are rated D–G; 1 has 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
199homes with an energy certificate
8.5%solid walls, no insulation
86.4%heated by a gas boiler
1heat pumps
Article 4: An Article 4 direction published by Maldon covers part of this area (about 8% of it), but the published data does not say which rights it removes — check the direction before any work. (West Bowers Farm, Woodham Walter)
What needs planning permission in Chelmer and Blackwater Navigation
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: 39 in the area (grade I: 1, II*: 2). 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: 7% 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 = 199)
Walls
Homes
Share
Cavity wall, insulated (as built or unspecified)
106
53.3%
Modern wall (U-value from the design)
48
24.1%
Solid wall (brick or stone), no insulation
17
8.5%
Cavity wall, filled
14
7.0%
Timber frame
12
6.0%
Cavity wall, unfilled
2
1.0%
Heating
Homes
Share
Gas boiler
172
86.4%
Oil
13
6.5%
Electric (storage heaters, panels, boiler)
12
6.0%
Heat pump
1
0.5%
LPG
1
0.5%
Loft / roof insulation
Homes
Share
No insulation
5
2.5%
Under 200 mm
34
17.1%
200 mm or more
66
33.2%
Insulated (depth not recorded)
39
19.6%
Flat or other home above
7
3.5%
Other
48
24.1%
Windows
Homes
Share
Double glazed
185
93.0%
Single glazed
12
6.0%
Secondary glazing
2
1.0%
BCD
Energy rating: A 2 (1.0%) · B 33 (16.6%) · C 120 (60.3%) · D 22 (11.1%) · E 11 (5.5%) · F 8 (4.0%) · G 3 (1.5%). Houses and bungalows: 93% of the homes; solar panels on 1.5% of the certificates. Most common build period on the certificates: 2007-2011. Designated: 20 November 1991.
Compared with Maldon and England
Share of homes
Chelmer and Blackwater Navigation
All 91 areas in Maldon
England
Solid walls, no insulation
8.5%
34.3%
48.7%
Gas boiler
86.4%
59.5%
66.4%
Rated D–G
22.1%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 47% of these are from 2020 or later (latest 6 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 Maldon if in doubt.
Boundary: Maldon District Council via planning.data.gov.uk (entity 44001675, reference 70, 510.3 ha). Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.