Solar panels, heat pumps and insulation in Marine Parade and Hinterland conservation area
In the Marine Parade and Hinterland conservation area (Worthing), 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 Worthing covers part of this area (about 3% of it) and removes permitted development rights for replacement windows and doors, and other alterations to the house, painting the outside, so there these need planning permission too. The area has 12 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. 774 homes inside the boundary have an energy certificate: 64.1% are solid-wall homes with no wall insulation, 59.0% heat with a gas boiler and 55.8% 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
774homes with an energy certificate
64.1%solid walls, no insulation
59.0%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Worthing covers part of this area (about 3% of it) and removes permitted development rights for replacement windows and doors, and other alterations to the house, painting the outside, so there these need planning permission too. (Western Row)
What needs planning permission in Marine Parade and Hinterland
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)
No permission needed (permitted development)
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)
Replacement windows and doors of similar appearance
Inside the Article 4 part of the area: planning permission needed; elsewhere: no permission needed (permitted development)
Part 1 Class A, A.3(a)
Listed buildings: 12 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: 84% 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 = 774)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
496
64.1%
Cavity wall, insulated (as built or unspecified)
93
12.0%
Modern wall (U-value from the design)
66
8.5%
Timber frame
33
4.3%
Other or not known
28
3.6%
Cavity wall, unfilled
24
3.1%
Solid wall, internal insulation
19
2.5%
Cavity wall, partly insulated
9
1.2%
Solid wall, insulated
3
0.4%
Cavity wall, filled
1
0.1%
Cavity wall, internal or external insulation
1
0.1%
Solid wall, partly insulated
1
0.1%
Heating
Homes
Share
Gas boiler
457
59.0%
Electric (storage heaters, panels, boiler)
295
38.1%
Communal heating
22
2.8%
Loft / roof insulation
Homes
Share
No insulation
86
11.1%
Under 200 mm
109
14.1%
200 mm or more
62
8.0%
Insulated (depth not recorded)
44
5.7%
Flat or other home above
449
58.0%
Other
24
3.1%
Windows
Homes
Share
Double glazed
595
76.9%
Single glazed
159
20.5%
Secondary glazing
19
2.5%
Triple glazed
1
0.1%
BCDE
Energy rating: B 84 (10.9%) · C 258 (33.3%) · D 249 (32.2%) · E 165 (21.3%) · F 14 (1.8%) · G 4 (0.5%). Houses and bungalows: 16% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: before 1900. Designated: 14 March 2000.
Compared with Worthing and England
Share of homes
Marine Parade and Hinterland
All 26 areas in Worthing
England
Solid walls, no insulation
64.1%
49.8%
48.7%
Gas boiler
59.0%
61.5%
66.4%
Rated D–G
55.8%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 48% of these are from 2020 or later (latest 17 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 Worthing if in doubt.
Boundary: Worthing Borough Council via planning.data.gov.uk (entity 44014018, reference WCA14, 12.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.