Solar panels, heat pumps and insulation in Warwick Gardens conservation area
In the Warwick Gardens 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 this area and removes permitted development rights for 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. 131 homes inside the boundary have an energy certificate: 69.5% are solid-wall homes with no wall insulation, 53.4% heat with a gas boiler and 65.6% 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
131homes with an energy certificate
69.5%solid walls, no insulation
53.4%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Worthing covers this area and removes permitted development rights for 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. (Warwick Gardens)
What needs planning permission in Warwick Gardens
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
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: 71% 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 = 131)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
91
69.5%
Solid wall, internal insulation
15
11.5%
Solid wall, insulated
8
6.1%
Modern wall (U-value from the design)
6
4.6%
Solid wall, external insulation
4
3.1%
Timber frame
4
3.1%
Cavity wall, unfilled
2
1.5%
Cavity wall, insulated (as built or unspecified)
1
0.8%
Heating
Homes
Share
Gas boiler
70
53.4%
Electric (storage heaters, panels, boiler)
38
29.0%
Communal heating
23
17.6%
Loft / roof insulation
Homes
Share
No insulation
5
3.8%
Under 200 mm
37
28.2%
200 mm or more
19
14.5%
Insulated (depth not recorded)
9
6.9%
Flat or other home above
56
42.7%
Other
5
3.8%
Windows
Homes
Share
Double glazed
88
67.2%
Single glazed
43
32.8%
CDE
Energy rating: B 6 (4.6%) · C 39 (29.8%) · D 57 (43.5%) · E 23 (17.6%) · F 5 (3.8%) · G 1 (0.8%). Houses and bungalows: 29% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 January 1985.
Compared with Worthing and England
Share of homes
Warwick Gardens
All 26 areas in Worthing
England
Solid walls, no insulation
69.5%
49.8%
48.7%
Gas boiler
53.4%
61.5%
66.4%
Rated D–G
65.6%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 62% 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 Worthing if in doubt.
Boundary: Worthing Borough Council via planning.data.gov.uk (entity 44014007, reference WCA25, 2.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.