Solar panels, heat pumps and insulation in City Docks conservation area
In the City Docks conservation area (Bristol), 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 Bristol covers this area but deals with other things (such as changes of use); it does not change the rules below. The area has 64 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. 2,662 homes inside the boundary have an energy certificate: 6.5% are solid-wall homes with no wall insulation, 49.3% heat with a gas boiler and 15.3% are rated D–G; 11 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
2,662homes with an energy certificate
6.5%solid walls, no insulation
49.3%heated by a gas boiler
11heat pumps
Article 4: An Article 4 direction published by Bristol covers this area but deals with other things (such as changes of use); it does not change the rules below. (Article 4 South; Ashley Ward, Cabot Ward, Clifton East Ward, Cotham Ward and Lawrence Hill Ward (1999 ward boundary); Clifton Ward (1999 ward boundary))
What needs planning permission in City Docks
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: 64 in the area (grade I: 0, II*: 9). 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: 89% 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 = 2,662)
Walls
Homes
Share
Modern wall (U-value from the design)
748
28.1%
Other or not known
713
26.8%
Cavity wall, insulated (as built or unspecified)
711
26.7%
Solid wall (brick or stone), no insulation
172
6.5%
Timber frame
118
4.4%
Cavity wall, partly insulated
76
2.9%
Cavity wall, filled
75
2.8%
Solid wall, insulated
25
0.9%
Solid wall, external insulation
9
0.3%
Cavity wall, unfilled
7
0.3%
Solid wall, internal insulation
5
0.2%
Cavity wall, internal or external insulation
2
0.1%
Solid wall, partly insulated
1
0.0%
Heating
Homes
Share
Gas boiler
1,312
49.3%
Electric (storage heaters, panels, boiler)
673
25.3%
Communal heating
665
25.0%
Heat pump
11
0.4%
Oil
1
0.0%
Loft / roof insulation
Homes
Share
No insulation
49
1.8%
Under 200 mm
152
5.7%
200 mm or more
138
5.2%
Insulated (depth not recorded)
286
10.7%
Flat or other home above
1,754
65.9%
Other
283
10.6%
Windows
Homes
Share
Double glazed
2,568
96.5%
Single glazed
77
2.9%
Triple glazed
9
0.3%
Secondary glazing
8
0.3%
BCD
Energy rating: B 1,198 (45.0%) · C 1,058 (39.7%) · D 316 (11.9%) · E 75 (2.8%) · F 14 (0.5%) · G 1 (0.0%). Houses and bungalows: 11% of the homes; solar panels on 0.3% of the certificates. Most common build period on the certificates: 2003-2006. Designated: 19 September 1979.
Compared with Bristol and England
Share of homes
City Docks
All 34 areas in Bristol
England
Solid walls, no insulation
6.5%
43.8%
48.7%
Gas boiler
49.3%
62.5%
66.4%
Rated D–G
15.3%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 63% of these are from 2020 or later (latest 30 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 Bristol if in doubt.
Boundary: Bristol City Council via planning.data.gov.uk (entity 44010605, reference CA17, 115.6 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.