Solar panels, heat pumps and insulation in Ashwood Road and Heathside Park Road, Woking conservation area
In the Ashwood Road and Heathside Park Road, Woking conservation area (Woking), 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 1 listed building; on a listed building solar panels and heat pumps are not permitted development at all and need planning permission and listed building consent. 112 homes inside the boundary have an energy certificate: 42.9% are solid-wall homes with no wall insulation, 77.7% heat with a gas boiler and 57.1% 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
112homes with an energy certificate
42.9%solid walls, no insulation
77.7%heated by a gas boiler
0heat pumps
Article 4: Woking does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Ashwood Road and Heathside Park Road, Woking
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: 1 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: 35% 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 = 112)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
48
42.9%
Cavity wall, filled
16
14.3%
Cavity wall, unfilled
14
12.5%
Cavity wall, insulated (as built or unspecified)
11
9.8%
Solid wall, partly insulated
10
8.9%
Timber frame
8
7.1%
Cavity wall, partly insulated
2
1.8%
Modern wall (U-value from the design)
1
0.9%
Solid wall, external insulation
1
0.9%
Solid wall, insulated
1
0.9%
Heating
Homes
Share
Gas boiler
87
77.7%
Communal heating
24
21.4%
Electric (storage heaters, panels, boiler)
1
0.9%
Loft / roof insulation
Homes
Share
No insulation
11
9.8%
Under 200 mm
39
34.8%
200 mm or more
20
17.9%
Insulated (depth not recorded)
21
18.8%
Flat or other home above
20
17.9%
Other
1
0.9%
Windows
Homes
Share
Double glazed
71
63.4%
Single glazed
33
29.5%
Secondary glazing
8
7.1%
CDE
Energy rating: B 1 (0.9%) · C 47 (42.0%) · D 45 (40.2%) · E 14 (12.5%) · F 5 (4.5%). Houses and bungalows: 65% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: 1900-1929.
Compared with Woking and England
Share of homes
Ashwood Road and Heathside Park Road, Woking
All 28 areas in Woking
England
Solid walls, no insulation
42.9%
32.5%
48.7%
Gas boiler
77.7%
75.7%
66.4%
Rated D–G
57.1%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 35% of these are from 2020 or later (latest 11 September 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 Woking if in doubt.
Boundary: Woking Borough Council via planning.data.gov.uk (entity 44004300, reference 7805, 14.5 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.