“We’re in a conservation area” is the single most common reason we hear for not asking about solar in Dorking, and it is usually the wrong reason. The town does have a genuine planning wrinkle, but it is narrower and more specific than most people assume. Here is where the line actually falls, with the sources.
What “permitted development” means for a Dorking roof
Roof-mounted solar on a house in England is permitted development — no planning application — under Schedule 2, Part 14, Class A of the General Permitted Development Order, as amended from 27 August 2026. The conditions are practical ones: the panels must not project more than 0.2 metres beyond the roof slope, must not sit higher than the highest part of the roof (chimneys excluded), must be sited so far as practicable to minimise their effect on the building’s external appearance and the amenity of the area, and must be removed when no longer needed.
Inside a conservation area the rule is tighter in exactly one respect: permitted development is lost for panels installed on a wall, balcony or roof enclosure that fronts a highway. Roof slopes — including front roof slopes — are not restricted by that clause. A flat-roof array on “article 2(3) land”, which includes conservation areas and National Landscapes, needs an application for a prior-approval determination on appearance before work starts. And Class A does not apply at all to a listed house or a building in its curtilage, so panels there need a planning application and listed building consent.
Dorking’s real exception: the Article 4 Direction
An Article 4 Direction lets a council remove permitted development rights in a defined area. Mole Valley has 26 conservation areas, and Dorking’s is one of only three — alongside Brockham and Leatherhead — where an Article 4 Direction places additional planning controls on parts of the area on top of the standard conservation-area rules. The older properties around the High Street, West Street and South Street are where it bites, and it is also where many of the district’s more than 1,000 listed buildings sit.
The practical consequence is simple: for a central Dorking address, a planning check is step one, before a panel count or a price. Carrying out work that needs listed building consent without obtaining it is a criminal offence, which is why we screen designations at the survey stage rather than discover them on installation day. For the rest of the town — Deepdene, Goodwyns, Chart Downs, Pixham, North Holmwood — the ordinary permitted-development conditions apply.
Other Surrey towns draw the line in different places. In Ewell, three conservation areas carry Article 4 directions dated 3 February 2000, and the Ewell Village direction covers alterations to a roof slope that fronts a highway, private road or open space; our solar panels Ewell page sets out what that means for a street-facing array.
The Surrey Hills
Dorking sits directly beneath Box Hill, inside the Surrey Hills National Landscape — designated an Area of Outstanding Natural Beauty in 1958, with planning weight equivalent to a National Park. Roof-mounted solar on a house usually remains permitted development on designated land, but the National Landscape is article 2(3) land, so the flat-roof prior-approval rule above applies there too, and the rules are read more tightly.
The boundary itself has been under review: Natural England’s formal notice period on proposed Surrey Hills extensions ran from 21 November 2025 to 14 January 2026. If your home is in one of the villages around the town — Westhumble, Westcott, Brockham — check the current maps rather than assuming you are inside or outside the line. A proper survey confirms the position either way.
What the council is doing, and the group scheme
Mole Valley District Council declared a climate emergency on 18 June 2019, has pledged to make its own operations carbon neutral by 2030, and reports progress through annual Climate Change Action Plans. For householders the practical strand is Solar Together, the Surrey-wide group-buying scheme the council backs: over 1,300 solar panels have gone onto Mole Valley roofs through it, with a projected carbon saving of more than 100 tonnes a year across the district.
The scheme now trades as Switch Together, and when we checked on 16 September 2026 its Mole Valley page was taking registrations. Registering is free and commits you to nothing. The sensible use of any group offer is as one of two quotes: get an installer quote for exactly the same specification — panel count and wattage, inverter, battery capacity, warranty terms, scaffolding, grid notification — and compare the totals. Residential installations carry 0% VAT until 31 March 2027 whichever route you choose, reverting to 5% after. We are happy to be the second quote.
What a Dorking roof actually generates
Our solar panels Dorking page publishes a generation estimate for the town itself, run in the European Commission’s PVGIS 5.3 tool with the parameters shown: a 4 kWp array at 35°, facing due south, with 14% system losses, is estimated at about 4,049 kWh a year — roughly 1,012 kWh per kWp — with year-to-year variation of around ±138 kWh. A real local reference point sits alongside it: Dorking Solar Group was co-founded in 2015 to get local people and businesses fitting solar PV, and one co-founder’s 1930s Dorking semi, with a 3 kW, twelve-panel array installed in 2016, generates about 2,800 kWh of electricity a year.
Two other local facts matter to the arithmetic. Mole Valley’s homes lean the right way — 37.6% detached and 28.1% semi-detached at the 2021 Census, with owner-occupation at 73.2% — so most Dorking roofs take the typical twelve-panel system the Energy Saving Trust describes, currently about £7,600 installed for a 4.5 kWp array (their figure, updated 27 August 2026). But 58% of the district’s homes sit at EPC band D or below, against an England and Wales average of 53%, so for an older house insulation sometimes belongs in the same budget. Your network operator is UK Power Networks under its South Eastern licence, and the G98 or G99 connection paperwork is the installer’s job. The savings calculator lets you test your own usage against the Dorking estimate before you talk to anyone.
Sources: legislation.gov.uk, Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2 Part 14 (as amended by S.I. 2026/896, in force 27 August 2026); Mole Valley District Council — Conservation Areas, Listed Buildings, and Our journey so far (Climate Change Action Plan); Surrey Hills National Landscape; Natural England, Surrey Hills boundary variation notice (21 November 2025 to 14 January 2026); Dorking Solar Group; ONS Census 2021 (TS044, TS054); Switch Together, Mole Valley page (read 16 September 2026); Energy Saving Trust, Solar panels: costs, savings and benefits explained (updated 27 August 2026); HMRC VAT Notice 708/6; European Commission JRC, PVGIS 5.3 (run 16 September 2026); UK Power Networks.