Solar panels, heat pumps and insulation in Walton Manor conservation area
In the Walton Manor conservation area (Oxford), 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 Oxford covers this area and removes permitted development rights for solar panels on the house, replacement windows and doors, and other alterations to the house, alterations to the roof (e.g. rooflights), painting the outside, so there these need planning permission too. The area has 9 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. 363 homes inside the boundary have an energy certificate: 56.2% are solid-wall homes with no wall insulation, 71.6% heat with a gas boiler and 66.4% are rated D–G; 4 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
363homes with an energy certificate
56.2%solid walls, no insulation
71.6%heated by a gas boiler
4heat pumps
Article 4: An Article 4 direction published by Oxford covers this area and removes permitted development rights for solar panels on the house, replacement windows and doors, and other alterations to the house, alterations to the roof (e.g. rooflights), painting the outside, so there these need planning permission too. (Houses in Multiple Occupation Article 4 Direction; The Jericho Article 4 Direction)
What needs planning permission in Walton Manor
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)
Planning permission needed (an Article 4 direction here removes this right)
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)
Planning permission needed (an Article 4 direction here removes this right)
Replacement windows and doors of similar appearance
Planning permission needed (an Article 4 direction here removes this right)
Part 1 Class A, A.3(a)
Listed buildings: 9 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: 41% 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 = 363)
Walls
Homes
Share
Solid wall (brick or stone), no insulation
204
56.2%
Cavity wall, unfilled
73
20.1%
Cavity wall, insulated (as built or unspecified)
23
6.3%
Cavity wall, partly insulated
20
5.5%
Solid wall, internal insulation
12
3.3%
Other or not known
10
2.8%
Cavity wall, filled
9
2.5%
Timber frame
8
2.2%
Solid wall, partly insulated
2
0.6%
Modern wall (U-value from the design)
1
0.3%
Solid wall, insulated
1
0.3%
Heating
Homes
Share
Gas boiler
260
71.6%
Electric (storage heaters, panels, boiler)
61
16.8%
Communal heating
38
10.5%
Heat pump
4
1.1%
Loft / roof insulation
Homes
Share
No insulation
70
19.3%
Under 200 mm
87
24.0%
200 mm or more
52
14.3%
Insulated (depth not recorded)
50
13.8%
Flat or other home above
101
27.8%
Other
3
0.8%
Windows
Homes
Share
Double glazed
258
71.1%
Single glazed
68
18.7%
Secondary glazing
37
10.2%
CDE
Energy rating: B 4 (1.1%) · C 118 (32.5%) · D 166 (45.7%) · E 67 (18.5%) · F 8 (2.2%). Houses and bungalows: 59% of the homes; solar panels on 0.0% of the certificates. Most common build period on the certificates: before 1900. Designated: 15 April 1975.
Compared with Oxford and England
Share of homes
Walton Manor
All 18 areas in Oxford
England
Solid walls, no insulation
56.2%
41.0%
48.7%
Gas boiler
71.6%
69.7%
66.4%
Rated D–G
66.4%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 66% 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 Oxford if in doubt.
Boundary: Oxford City Council via planning.data.gov.uk (entity 44015792, reference SSLZMFZX0004, 10.2 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.