Solar panels, heat pumps and insulation in Historic City conservation area
In the Historic City conservation area (Worcester), 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 275 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. 1,429 homes inside the boundary have an energy certificate: 23.7% are solid-wall homes with no wall insulation, 39.2% heat with a gas boiler and 40.0% are rated D–G; 9 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
1,429homes with an energy certificate
23.7%solid walls, no insulation
39.2%heated by a gas boiler
9heat pumps
Article 4: Worcester does not publish Article 4 areas on planning.data.gov.uk — check with the council.
What needs planning permission in Historic City
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: 275 in the area (grade I: 11, II*: 28). 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: 86% 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 = 1,429)
Walls
Homes
Share
Cavity wall, insulated (as built or unspecified)
499
34.9%
Modern wall (U-value from the design)
361
25.3%
Solid wall (brick or stone), no insulation
339
23.7%
Cavity wall, unfilled
45
3.1%
Solid wall, internal insulation
39
2.7%
Cavity wall, filled
38
2.7%
Solid wall, insulated
38
2.7%
Timber frame
31
2.2%
Solid wall, external insulation
15
1.0%
Cavity wall, partly insulated
9
0.6%
Other or not known
7
0.5%
Solid wall, partly insulated
6
0.4%
Cavity wall, internal or external insulation
2
0.1%
Heating
Homes
Share
Electric (storage heaters, panels, boiler)
799
55.9%
Gas boiler
560
39.2%
Communal heating
59
4.1%
Heat pump
9
0.6%
LPG
1
0.1%
Other
1
0.1%
Loft / roof insulation
Homes
Share
No insulation
82
5.7%
Under 200 mm
102
7.1%
200 mm or more
187
13.1%
Insulated (depth not recorded)
171
12.0%
Flat or other home above
741
51.9%
Other
146
10.2%
Windows
Homes
Share
Double glazed
1,142
79.9%
Single glazed
178
12.5%
Secondary glazing
105
7.3%
Triple glazed
3
0.2%
Other
1
0.1%
BCDE
Energy rating: B 203 (14.2%) · C 655 (45.8%) · D 383 (26.8%) · E 168 (11.8%) · F 14 (1.0%) · G 6 (0.4%). Houses and bungalows: 14% of the homes; solar panels on 0.1% of the certificates. Most common build period on the certificates: before 1900. Designated: 1 January 1969.
Compared with Worcester and England
Share of homes
Historic City
All 18 areas in Worcester
England
Solid walls, no insulation
23.7%
34.8%
48.7%
Gas boiler
39.2%
51.5%
66.4%
Rated D–G
40.0%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 56% of these are from 2020 or later (latest 27 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 Worcester if in doubt.
Boundary: Worcester City Council via planning.data.gov.uk (entity 44003492, reference 1713, 48.0 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.