Solar panels, heat pumps and insulation in Arundel conservation area
In the Arundel conservation area (South Downs National Park Authority), 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. The area has 197 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. 571 homes inside the boundary have an energy certificate: 47.3% are solid-wall homes with no wall insulation, 78.3% heat with a gas boiler and 62.9% 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
571homes with an energy certificate
47.3%solid walls, no insulation
78.3%heated by a gas boiler
1heat pumps
Article 4: South Downs National Park Authority does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Arundel
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: 197 in the area (grade I: 3, II*: 5). 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: 33% 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 = 571)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
270
47.3%
Cavity wall, insulated (as built or unspecified)
149
26.1%
Modern wall (U-value from the design)
34
6.0%
Timber frame
32
5.6%
Cavity wall, filled
25
4.4%
Cavity wall, unfilled
25
4.4%
Cavity wall, partly insulated
10
1.8%
Solid wall, internal insulation
10
1.8%
Solid wall, insulated
9
1.6%
Solid wall, partly insulated
5
0.9%
Other or not known
2
0.4%
Heating
Homes
Share
Gas boiler
447
78.3%
Electric (storage heaters, panels, boiler)
117
20.5%
Communal heating
4
0.7%
Oil
2
0.4%
Heat pump
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
97
17.0%
Under 200 mm
150
26.3%
200 mm or more
97
17.0%
Insulated (depth not recorded)
100
17.5%
Flat or other home above
105
18.4%
Other
22
3.9%
Windows
Homes
Share
Double glazed
417
73.0%
Single glazed
134
23.5%
Secondary glazing
20
3.5%
CDE
Energy rating: B 39 (6.8%) · C 173 (30.3%) · D 205 (35.9%) · E 120 (21.0%) · F 30 (5.3%) · G 4 (0.7%). Houses and bungalows: 67% of the homes; solar panels on 0.4% of the certificates. Most common build period on the certificates: before 1900. Designated: 5 March 1975.
Compared with South Downs National Park Authority and England
Share of homes
Arundel
All 124 areas in South Downs National Park Authority
England
Solid walls, no insulation
47.3%
47.0%
48.7%
Gas boiler
78.3%
54.9%
66.4%
Rated D–G
62.9%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 53% of these are from 2020 or later (latest 20 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 South Downs National Park Authority if in doubt.
Boundary: South Downs National Park Authority via planning.data.gov.uk (entity 44001991, reference 1621, 58.9 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.