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Solar panels, heat pumps and insulation in Loose Valley conservation area

In the Loose Valley conservation area (Maidstone), 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 Maidstone covers part of this area (about 39% of it), but the published data does not say which rights it removes — check the direction before any work. The area has 49 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. 175 homes inside the boundary have an energy certificate: 44.0% are solid-wall homes with no wall insulation, 87.4% heat with a gas boiler and 70.9% are rated D–G; 0 have a heat pump. EPC register November 2026; rules as at 21 October 2026.

How it works ↓

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

175homes with an energy certificate
44.0%solid walls, no insulation
87.4%heated by a gas boiler
0heat pumps

Article 4: An Article 4 direction published by Maidstone covers part of this area (about 39% of it), but the published data does not say which rights it removes — check the direction before any work. (Butlers Farm Loose; Land adjacent Loose Stream; Land at Butlers Farm; Land at Cave Hill; Land at Loose Hill Loose; Land at Teasaucer Hil)

What needs planning permission in Loose Valley

Work (house, not listed)In a conservation areaRule
Air source heat pump on a wall or roof facing the road, or nearer the road than the housePlanning permission neededPart 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 councilPart 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 councilPart 14 Class A, A.2(c)
Solar panels on a wall, balcony or roof enclosure facing the roadPlanning permission neededPart 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 councilPart 14 Class A, condition A(ba)
External wall insulation (render, cladding, timber, tiles)Planning permission neededPart 1 Class A, A.2(a)
Internal wall insulation, loft insulation, cavity wall insulationNot development: no planning permission—
Replacement windows and doors of similar appearanceNo permission needed (permitted development), unless an Article 4 direction removes it — check with the councilPart 1 Class A, A.3(a)

In Loose Valley the first question is whether a house is listed or covered by a direction. In this rural area there are 49 listed buildings, three of them Grade II*, and Maidstone's Article 4 directions sit on sites such as “Land at Cave Hill” and “Land adjacent Loose Stream” and cover about 39% of the area. What they take away is set out in the text of each direction and on the council's map.

What you can do without permission

An ordinary house outside the directions follows the general rules for conservation areas: solar panels on the roof slope, an air source heat pump at the back, internal wall insulation and loft insulation, all without an application. One example: on a Grade II building, solar panels are no longer covered by permitted development, so planning permission and listed building consent are needed.

On the EPC register as of November 2026, 44% of the 175 houses have uninsulated solid walls (43.3% across Maidstone's conservation areas), 87% have a gas boiler, there are no heat pumps, and solar panels appear on 2.3% of certificates. The rules are national as of 21 October 2026; anything disputed is decided by Maidstone council.

The homes in the area (latest certificate per home, n = 175)

WallsHomesShare
Solid wall (brick or stone), no insulation7744.0%
Cavity wall, insulated (as built or unspecified)2715.4%
Cavity wall, filled2112.0%
Timber frame1910.9%
Cavity wall, unfilled137.4%
Modern wall (U-value from the design)63.4%
Solid wall, insulated31.7%
Cavity wall, partly insulated21.1%
Other or not known21.1%
Solid wall, internal insulation21.1%
Solid wall, partly insulated21.1%
Cavity wall, internal or external insulation10.6%
HeatingHomesShare
Gas boiler15387.4%
Electric (storage heaters, panels, boiler)179.7%
Oil42.3%
LPG10.6%
Loft / roof insulationHomesShare
No insulation3922.3%
Under 200 mm3821.7%
200 mm or more4827.4%
Insulated (depth not recorded)3721.1%
Flat or other home above74.0%
Other63.4%
WindowsHomesShare
Double glazed12370.3%
Single glazed4425.1%
Secondary glazing84.6%

Energy rating: B 5 (2.9%) · C 46 (26.3%) · D 62 (35.4%) · E 50 (28.6%) · F 9 (5.1%) · G 3 (1.7%). Houses and bungalows: 82% of the homes; solar panels on 2.3% of the certificates. Most common build period on the certificates: before 1900. Designated: 15 August 2000.

Compared with Maidstone and England

Share of homesLoose ValleyAll 48 areas in MaidstoneEngland
Solid walls, no insulation44.0%43.3%48.7%
Gas boiler87.4%66.3%66.4%
Rated D–G70.9%—56.5%

Caveats

All conservation areas in Maidstone · The rules for every conservation area

Guides: Heat pumps · Solar panels · External wall insulation · Replacement windows · Am I in a conservation area? Postcode checker