Solar panels, heat pumps and insulation in North Waltham conservation area
In the North Waltham conservation area (Basingstoke and Deane), 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 15 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. 103 homes inside the boundary have an energy certificate: 17.5% are solid-wall homes with no wall insulation, 1.9% heat with a gas boiler and 88.3% are rated D–G; 14 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
103homes with an energy certificate
17.5%solid walls, no insulation
1.9%heated by a gas boiler
14heat pumps
Article 4: Basingstoke and Deane publishes its Article 4 areas on planning.data.gov.uk and none overlaps this area; a direction can still exist on paper, so check with the council.
What needs planning permission in North Waltham
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
No permission needed (permitted development)
Part 1 Class A, A.3(a)
Listed buildings: 15 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: 0% 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 = 103)
Walls
Homes
Share
Cavity wall, filled
49
47.6%
Solid wall (brick or stone), no insulation
18
17.5%
Cavity wall, unfilled
11
10.7%
Cavity wall, insulated (as built or unspecified)
8
7.8%
Cavity wall, partly insulated
5
4.9%
Timber frame
5
4.9%
Modern wall (U-value from the design)
4
3.9%
Solid wall, internal insulation
2
1.9%
Cavity wall, internal or external insulation
1
1.0%
Heating
Homes
Share
Oil
54
52.4%
Electric (storage heaters, panels, boiler)
19
18.4%
Heat pump
14
13.6%
LPG
10
9.7%
Solid fuel (wood, coal)
4
3.9%
Gas boiler
2
1.9%
Loft / roof insulation
Homes
Share
No insulation
6
5.8%
Under 200 mm
28
27.2%
200 mm or more
48
46.6%
Insulated (depth not recorded)
11
10.7%
Other
10
9.7%
Windows
Homes
Share
Double glazed
92
89.3%
Single glazed
7
6.8%
Secondary glazing
3
2.9%
Triple glazed
1
1.0%
CDEF
Energy rating: A 1 (1.0%) · B 2 (1.9%) · C 9 (8.7%) · D 33 (32.0%) · E 43 (41.7%) · F 9 (8.7%) · G 6 (5.8%). Houses and bungalows: 100% of the homes; solar panels on 1.0% of the certificates. Most common build period on the certificates: 1950-1966. Designated: 1 January 1981.
Compared with Basingstoke and Deane and England
Share of homes
North Waltham
All 43 areas in Basingstoke and Deane
England
Solid walls, no insulation
17.5%
24.3%
48.7%
Gas boiler
1.9%
62.0%
66.4%
Rated D–G
88.3%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 59% of these are from 2020 or later (latest 12 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 Basingstoke and Deane if in doubt.
Boundary: Basingstoke and Deane Borough Council via planning.data.gov.uk (entity 44016260, reference 8466, 26.5 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.