Solar panels, heat pumps and insulation in Tetbury conservation area
In the Tetbury conservation area (Cotswold), 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 Cotswold covers part of this area (about 2% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 225 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. 564 homes inside the boundary have an energy certificate: 63.3% are solid-wall homes with no wall insulation, 79.6% heat with a gas boiler and 74.5% are rated D–G; 5 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
564homes with an energy certificate
63.3%solid walls, no insulation
79.6%heated by a gas boiler
5heat pumps
Article 4: An Article 4 direction published by Cotswold covers part of this area (about 2% of it), but the published data does not say which rights it removes — check the direction before any work. (Article 4 Direction Bath Road Tetbury)
What needs planning permission in Tetbury
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: 225 in the area (grade I: 4, II*: 4). 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: 35% 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 = 564)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
357
63.4%
Cavity wall, insulated (as built or unspecified)
62
11.0%
Cavity wall, filled
54
9.6%
Modern wall (U-value from the design)
25
4.4%
Solid wall, insulated
20
3.6%
Cavity wall, unfilled
14
2.5%
Timber frame
12
2.1%
Cavity wall, partly insulated
9
1.6%
Other or not known
5
0.9%
Solid wall, internal insulation
4
0.7%
Solid wall, partly insulated
1
0.2%
Heating
Homes
Share
Gas boiler
449
79.6%
Electric (storage heaters, panels, boiler)
83
14.7%
Communal heating
23
4.1%
Heat pump
5
0.9%
Oil
2
0.4%
LPG
1
0.2%
Solid fuel (wood, coal)
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
102
18.1%
Under 200 mm
116
20.6%
200 mm or more
131
23.2%
Insulated (depth not recorded)
110
19.5%
Flat or other home above
83
14.7%
Other
22
3.9%
Windows
Homes
Share
Double glazed
433
76.8%
Single glazed
91
16.1%
Secondary glazing
37
6.6%
Triple glazed
3
0.5%
CDE
Energy rating: B 21 (3.7%) · C 123 (21.8%) · D 261 (46.3%) · E 125 (22.2%) · F 31 (5.5%) · G 3 (0.5%). Houses and bungalows: 65% of the homes; solar panels on 0.2% of the certificates. Most common build period on the certificates: before 1900. Designated: 24 March 1971.
Compared with Cotswold and England
Share of homes
Tetbury
All 144 areas in Cotswold
England
Solid walls, no insulation
63.3%
59.2%
48.7%
Gas boiler
79.6%
45.1%
66.4%
Rated D–G
74.5%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 47% of these are from 2020 or later (latest 8 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 Cotswold if in doubt.
Boundary: Cotswold District Council via planning.data.gov.uk (entity 44014675, reference CONARA/127, 60.0 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.