Solar panels, heat pumps and insulation in Rothesay 4 conservation area
In the Rothesay 4 conservation area (Luton), 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. 554 homes inside the boundary have an energy certificate: 53.6% are solid-wall homes with no wall insulation, 58.3% heat with a gas boiler and 47.8% 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
554homes with an energy certificate
53.6%solid walls, no insulation
58.3%heated by a gas boiler
0heat pumps
Article 4: Luton 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 Rothesay 4
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: none recorded inside the boundary; on a listed building, solar panels and heat pumps are not permitted development and need listed building consent.
Flats: 83% 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 = 554)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
297
53.6%
Cavity wall, insulated (as built or unspecified)
78
14.1%
Modern wall (U-value from the design)
44
7.9%
Timber frame
29
5.2%
Solid wall, internal insulation
25
4.5%
Cavity wall, partly insulated
19
3.4%
Cavity wall, filled
18
3.2%
Cavity wall, unfilled
16
2.9%
Solid wall, external insulation
12
2.2%
Solid wall, insulated
8
1.4%
Other or not known
4
0.7%
Solid wall, partly insulated
3
0.5%
Cavity wall, internal or external insulation
1
0.2%
Heating
Homes
Share
Gas boiler
323
58.3%
Electric (storage heaters, panels, boiler)
150
27.1%
Communal heating
80
14.4%
LPG
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
55
9.9%
Under 200 mm
74
13.4%
200 mm or more
50
9.0%
Insulated (depth not recorded)
37
6.7%
Flat or other home above
318
57.4%
Other
20
3.6%
Windows
Homes
Share
Double glazed
512
92.4%
Single glazed
39
7.0%
Secondary glazing
3
0.5%
CDE
Energy rating: B 33 (6.0%) · C 256 (46.2%) · D 182 (32.9%) · E 73 (13.2%) · F 7 (1.3%) · G 3 (0.5%). Houses and bungalows: 17% of the homes; solar panels on 0.4% of the certificates. Most common build period on the certificates: 1900-1929. Designated: 7 July 2003.
Compared with Luton and England
Share of homes
Rothesay 4
All 5 areas in Luton
England
Solid walls, no insulation
53.6%
39.8%
48.7%
Gas boiler
58.3%
40.0%
66.4%
Rated D–G
47.8%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 63% 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 Luton if in doubt.
Boundary: Luton Borough Council via planning.data.gov.uk (entity 44016441, reference CA4, 14.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.