Solar panels, heat pumps and insulation in Rothwell conservation area
In the Rothwell conservation area (North Northamptonshire), 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 27 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. 241 homes inside the boundary have an energy certificate: 44.8% are solid-wall homes with no wall insulation, 72.2% heat with a gas boiler and 51.0% 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
241homes with an energy certificate
44.8%solid walls, no insulation
72.2%heated by a gas boiler
14heat pumps
Article 4: North Northamptonshire does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Rothwell
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: 27 in the area (grade I: 2, II*: 1). 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: 62% 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 = 241)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
108
44.8%
Cavity wall, insulated (as built or unspecified)
64
26.6%
Solid wall, insulated
23
9.5%
Modern wall (U-value from the design)
16
6.6%
Cavity wall, filled
9
3.7%
Solid wall, internal insulation
7
2.9%
Timber frame
7
2.9%
Cavity wall, partly insulated
5
2.1%
Cavity wall, unfilled
1
0.4%
Solid wall, partly insulated
1
0.4%
Heating
Homes
Share
Gas boiler
174
72.2%
Electric (storage heaters, panels, boiler)
43
17.8%
Heat pump
14
5.8%
Communal heating
10
4.1%
Loft / roof insulation
Homes
Share
No insulation
15
6.2%
Under 200 mm
38
15.8%
200 mm or more
77
32.0%
Insulated (depth not recorded)
32
13.3%
Flat or other home above
69
28.6%
Other
10
4.1%
Windows
Homes
Share
Double glazed
203
84.2%
Single glazed
35
14.5%
Secondary glazing
2
0.8%
Triple glazed
1
0.4%
BCDE
Energy rating: B 20 (8.3%) · C 98 (40.7%) · D 71 (29.5%) · E 46 (19.1%) · F 6 (2.5%). Houses and bungalows: 38% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: before 1900. Designated: 23 March 1978.
Compared with North Northamptonshire and England
Share of homes
Rothwell
All 82 areas in North Northamptonshire
England
Solid walls, no insulation
44.8%
55.5%
48.7%
Gas boiler
72.2%
72.3%
66.4%
Rated D–G
51.0%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 59% of these are from 2020 or later (latest 21 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 North Northamptonshire if in doubt.
Boundary: North Northamptonshire Council via planning.data.gov.uk (entity 44001648, reference 3165, 10.6 ha). Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.