Solar panels, heat pumps and insulation in Charlbury conservation area
In the Charlbury conservation area (West Oxfordshire), 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 West Oxfordshire covers part of this area (about 1% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 111 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. 999 homes inside the boundary have an energy certificate: 22.2% are solid-wall homes with no wall insulation, 83.5% heat with a gas boiler and 55.1% are rated D–G; 39 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
999homes with an energy certificate
22.2%solid walls, no insulation
83.5%heated by a gas boiler
39heat pumps
Article 4: An Article 4 direction published by West Oxfordshire covers part of this area (about 1% of it), but the published data does not say which rights it removes — check the direction before any work. (Article 4 (Charlbury 1); The Spendlove Centre)
What needs planning permission in Charlbury
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: 111 in the area (grade I: 1, 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: 12% 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 = 999)
Walls
Homes
Share
Cavity wall, filled
341
34.1%
Solid wall (brick or stone), no insulation
222
22.2%
Cavity wall, insulated (as built or unspecified)
163
16.3%
Cavity wall, unfilled
102
10.2%
Modern wall (U-value from the design)
100
10.0%
Cavity wall, partly insulated
27
2.7%
Solid wall, insulated
14
1.4%
Timber frame
10
1.0%
Solid wall, external insulation
7
0.7%
Cavity wall, internal or external insulation
6
0.6%
Solid wall, internal insulation
5
0.5%
Other or not known
1
0.1%
Solid wall, partly insulated
1
0.1%
Heating
Homes
Share
Gas boiler
834
83.5%
Electric (storage heaters, panels, boiler)
86
8.6%
Heat pump
39
3.9%
Oil
21
2.1%
Communal heating
16
1.6%
Solid fuel (wood, coal)
3
0.3%
Loft / roof insulation
Homes
Share
No insulation
85
8.5%
Under 200 mm
261
26.2%
200 mm or more
332
33.3%
Insulated (depth not recorded)
169
16.9%
Flat or other home above
56
5.6%
Other
95
9.5%
Windows
Homes
Share
Double glazed
927
92.8%
Single glazed
47
4.7%
Secondary glazing
22
2.2%
Triple glazed
3
0.3%
BCDE
Energy rating: A 3 (0.3%) · B 115 (11.5%) · C 331 (33.1%) · D 379 (37.9%) · E 138 (13.8%) · F 28 (2.8%) · G 5 (0.5%). Houses and bungalows: 88% of the homes; solar panels on 2.2% of the certificates. Most common build period on the certificates: 1967-1975. Designated: 3 January 1974.
Compared with West Oxfordshire and England
Share of homes
Charlbury
All 50 areas in West Oxfordshire
England
Solid walls, no insulation
22.2%
39.3%
48.7%
Gas boiler
83.5%
61.6%
66.4%
Rated D–G
55.1%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 46% of these are from 2020 or later (latest 25 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 West Oxfordshire if in doubt.
Boundary: West Oxfordshire District Council via planning.data.gov.uk (entity 44014528, reference CONARA/005, 268.7 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.