Solar panels, heat pumps and insulation in Lyndhurst conservation area
In the Lyndhurst conservation area (New Forest National Park Authority), 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 New Forest National Park Authority covers this area but deals with other things (such as changes of use); it does not change the rules below. The area has 21 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. 440 homes inside the boundary have an energy certificate: 14.1% are solid-wall homes with no wall insulation, 80.9% heat with a gas boiler and 59.3% are rated D–G; 2 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
440homes with an energy certificate
14.1%solid walls, no insulation
80.9%heated by a gas boiler
2heat pumps
Article 4: An Article 4 direction published by New Forest National Park Authority covers this area but deals with other things (such as changes of use); it does not change the rules below. (ARTICLE 4 DIRECTION NP NEW FOREST CAMPSITE; ARTICLE 4 DIRECTION NP NEW FOREST RECREATIONAL CAMPSITE; New Forest National Park Boundary)
What needs planning permission in Lyndhurst
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: 21 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: 45% 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 = 440)
Walls
Homes
Share
Cavity wall, unfilled
145
33.0%
Modern wall (U-value from the design)
89
20.2%
Cavity wall, filled
77
17.5%
Solid wall (brick or stone), no insulation
62
14.1%
Cavity wall, insulated (as built or unspecified)
31
7.0%
Timber frame
14
3.2%
Solid wall, internal insulation
12
2.7%
Cavity wall, internal or external insulation
5
1.1%
Cavity wall, partly insulated
3
0.7%
Solid wall, external insulation
1
0.2%
Solid wall, insulated
1
0.2%
Heating
Homes
Share
Gas boiler
356
80.9%
Electric (storage heaters, panels, boiler)
75
17.0%
Communal heating
4
0.9%
Heat pump
2
0.5%
Solid fuel (wood, coal)
2
0.5%
Oil
1
0.2%
Loft / roof insulation
Homes
Share
No insulation
57
13.0%
Under 200 mm
93
21.1%
200 mm or more
108
24.5%
Insulated (depth not recorded)
45
10.2%
Flat or other home above
80
18.2%
Other
57
13.0%
Windows
Homes
Share
Double glazed
398
90.5%
Single glazed
30
6.8%
Secondary glazing
11
2.5%
Triple glazed
1
0.2%
BCDE
Energy rating: A 1 (0.2%) · B 77 (17.5%) · C 101 (23.0%) · D 161 (36.6%) · E 87 (19.8%) · F 9 (2.0%) · G 4 (0.9%). Houses and bungalows: 55% of the homes; solar panels on 1.8% of the certificates. Most common build period on the certificates: 1900-1929. Designated: 16 October 2008.
Compared with New Forest National Park Authority and England
Share of homes
Lyndhurst
All 26 areas in New Forest National Park Authority
England
Solid walls, no insulation
14.1%
18.8%
48.7%
Gas boiler
80.9%
55.2%
66.4%
Rated D–G
59.3%
—
56.5%
Caveats
Certificates describe a home when it was assessed; 50% 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 New Forest National Park Authority if in doubt.
Boundary: New Forest National Park Authority via planning.data.gov.uk (entity 44005389, reference CONA27, 59.8 ha); the council's appraisal or map. Homes are placed by the coordinates of their UPRN (OS Open UPRN); addresses are not shown.