Solar panels, heat pumps and insulation in High Town Road 2 conservation area
In the High Town Road 2 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. An Article 4 direction published by Luton covers this area but deals with other things (such as changes of use); it does not change the rules below. The area has 4 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. 130 homes inside the boundary have an energy certificate: 74.6% are solid-wall homes with no wall insulation, 53.1% heat with a gas boiler and 75.4% 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
130homes with an energy certificate
74.6%solid walls, no insulation
53.1%heated by a gas boiler
0heat pumps
Article 4: An Article 4 direction published by Luton covers this area but deals with other things (such as changes of use); it does not change the rules below. (Luton Town Centre and Surrounds (2023))
What needs planning permission in High Town Road 2
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: 4 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: 91% 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 = 130)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
97
74.6%
Solid wall, internal insulation
10
7.7%
Cavity wall, insulated (as built or unspecified)
9
6.9%
Modern wall (U-value from the design)
7
5.4%
Timber frame
5
3.8%
Cavity wall, unfilled
1
0.8%
Solid wall, insulated
1
0.8%
Heating
Homes
Share
Gas boiler
69
53.1%
Electric (storage heaters, panels, boiler)
60
46.2%
Communal heating
1
0.8%
Loft / roof insulation
Homes
Share
No insulation
31
23.8%
Under 200 mm
29
22.3%
200 mm or more
16
12.3%
Insulated (depth not recorded)
14
10.8%
Flat or other home above
35
26.9%
Other
5
3.8%
Windows
Homes
Share
Double glazed
124
95.4%
Single glazed
6
4.6%
CDE
Energy rating: B 1 (0.8%) · C 31 (23.8%) · D 54 (41.5%) · E 34 (26.2%) · F 5 (3.8%) · G 5 (3.8%). Houses and bungalows: 9% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: 1900-1929. Designated: 12 May 1998.
Compared with Luton and England
Share of homes
High Town Road 2
All 5 areas in Luton
England
Solid walls, no insulation
74.6%
39.8%
48.7%
Gas boiler
53.1%
40.0%
66.4%
Rated D–G
75.4%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 53% of these are from 2020 or later (latest 9 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 Luton if in doubt.
Boundary: Luton Borough Council via planning.data.gov.uk (entity 44016442, reference CA2, 2.1 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.