The short answer for Dorset: a 4kW south-facing system in Dorset generates about 4,500 kWh a year on the EU's PVGIS model — about 11% more than London. Installed prices for that size run roughly £6,600–£7,800 on the UK government's 2025/26 cost data, and at October–December 2026 Southern electricity prices (26.47p/kWh) it is worth roughly £800 a year without a battery, or £1,000 if a battery lets you use most of it yourself.
Dorset is one of the sunniest counties for solar, and one of the most protected: two National Landscapes cover more than half of the Dorset Council area, and four in ten homes are detached, many of them in villages. That mix means bigger roofs and better output than most of England, with more checks on listed, thatched and coastal homes. This page covers the Dorset Council area. Bournemouth, Christchurch and Poole is a separate council with its own planning rules.
How much a solar panel system generates in Dorset
The table uses the European Commission's PVGIS tool for Dorchester: crystalline panels at a 35° pitch, with PVGIS's standard 14% allowance for system losses and the local horizon. Your installer's MCS estimate will differ a little because MCS uses its own irradiance tables and your actual pitch and shading, but the gap between places and orientations is what matters here.
| Roof faces | Per kW | 3kW system | 4kW system | 6kW system |
|---|---|---|---|---|
| South | 1,126 kWh | 3,380 kWh | 4,500 kWh | 6,760 kWh |
| East | 883 kWh | 2,650 kWh | 3,530 kWh | 5,300 kWh |
| West | 889 kWh | 2,670 kWh | 3,560 kWh | 5,330 kWh |
Annual output, PVGIS 5.3 (SARAH3 satellite data, 2005–2023) for Dorchester, fetched 30 October 2026. Actual output varies year to year.
Of the 25 areas we cover, Dorset has the highest south-facing yield (Glasgow is lowest at 853 kWh per kW). The seasons matter as much as the location: in December a 4kW system here makes about 151 kWh for the whole month, against 546 kWh in June — which is why a battery is mostly a summer and shoulder-season tool, and why nobody should promise you winter bills near zero.
On the same PVGIS settings, a south-facing kW at Dorchester models about 7% more a year than one at Exeter, and about the same as Plymouth. Within Dorset, what moves your own figure most is the slope and what shades it, such as a hill behind a village in a valley, or tall trees in a garden.
Coastal homes: near the sea, from Lyme Regis to Swanage and on Portland, salt spray reaches roofs. Ask for panels certified for salt-mist corrosion (IEC 61701), stainless or coated fixings, and a warranty that doesn't exclude coastal sites.
What solar costs and saves in Dorset
There is no separate "Dorset price" for solar — installers price by system size, roof and access — so the fairest benchmark is the government's own cost series. Across domestic installations registered with MCS between April 2025 and March 2026, the average installed cost was £1,955 per kW for systems up to 4kW and £1,645 per kW for 4–10kW, VAT included and batteries excluded.
| System | Output in Dorset | Typical installed price | Year-one value, no battery | Simple payback |
|---|---|---|---|---|
| 3kW | 3,380 kWh | £4,900–£5,900 | £600 | 8–10 years |
| 4kW | 4,500 kWh | £6,600–£7,800 | £800 | 8–10 years |
| 6kW | 6,760 kWh | £9,900–£11,700 | £1,200 | 8–10 years |
Price range: DESNZ Solar PV cost data (published 28 May 2026), each size priced between the 4–10kW average (£1,645/kW) and the up-to-4kW average (£1,955/kW); bigger systems tend towards the lower figure per kW. Value: south-facing PVGIS output, 40% used in the home at the Southern price-cap unit rate of 26.47p/kWh (1 October to 31 December 2026), the rest exported at 12p/kWh (the 12p rate several large suppliers pay their own import customers in September 2026). Payback ignores panel degradation, future price changes and inverter replacement.
Two things move those numbers more than anything about Dorset itself. First, how much you use yourself: every unit you use saves 26.47p, every unit you export earns only what your export tariff pays — 12p in this illustration. Our illustration assumes you use 40% without a battery; with a battery taking that to around 70%, the same 4kW system is worth about £1,000 a year — but the battery adds several thousand pounds, so price it as its own line and judge it on its own payback (battery storage guide). Second, the export tariff: rates are set by suppliers, not Ofgem, and range widely — see the solar payback guide for current examples.
VAT on solar panels and batteries installed in homes is 0% until 31 March 2027 (how the relief works), so a quote that adds 20% VAT to a domestic install is wrong.
Switch Together Dorset: the 2026 round has closed
Dorset Council backs a solar and battery group-buying scheme run by Switch Together. Registration for the 2026/27 round closed on 25 September 2026; personal offers went out from 22 September, and installations are planned to finish by the end of June 2027 (Dorset Council). Switch Together now lists Dorset under recently closed schemes (Switch Together partners) and offers a sign-up for the next one. If you registered and have an offer, use it as a benchmark when you compare quotes, including the one we introduce you to.
Dorset homes and what they mean for your roof
Census 2021 counted 169,259 households in Dorset: 23.4% semi-detached, 19.3% terraced, 40.6% detached and 15.4% flats or maisonettes, with 70.4% owner-occupied and 16.3% privately rented (England and Wales: 61.6% owned).
That is far more detached homes and owner-occupiers than the England and Wales average. Many of those roofs have room for a 5–6kW system, so the real limit is often your own daytime use rather than space. Size the system to what you use and export, not to how many panels fit.
Old roofs need more thought. Panels are not fixed to thatch, so on a thatched cottage the options are an outbuilding roof or panels on the ground; a ground array has its own permitted development limits, including a cap of 9 square metres of panels, and tighter siting rules in a conservation area or World Heritage Site. Stone tiles on older Purbeck houses, and natural slate elsewhere, are slower to work on than concrete tile; ask how the brackets will be fixed and who pays for any broken tiles.
Nearly one in five Dorset homes heats with oil, LPG or electricity alone (8.7% oil only, 1.5% LPG only and 8.4% electricity only, Census 2021). For all-electric homes, solar cuts the most expensive daytime units directly. If you heat with oil, plan solar with a future heat pump in mind: see heat pump grants for oil and LPG homes.
If you live in Bournemouth, Christchurch or Poole, the census figures above don't include you, but the output and cost figures are close. For funded work there, see Bournemouth, Christchurch and Poole energy grants.
Planning permission in Dorset
For houses in England, roof-mounted solar is permitted development — no planning application — as long as the panels stand no more than 20cm proud of the roof slope and don't rise above the highest part of the roof. The main exceptions are listed buildings (which need listed building consent), panels mounted on a wall that faces a road in a conservation area, and properties where the council has removed permitted development rights with an Article 4 direction. Blocks of flats have their own, similar permitted development rules, but panels on a shared roof still need the freeholder's consent. The rules were last amended on 27 August 2026.
Dorset Council says the Dorset and Cranborne Chase National Landscapes together cover 56% of the council area, and the county has 9,217 listed buildings (Dorset Council data). Its pages count 48 conservation areas in the former North Dorset district, 25 in Purbeck and 15 in Weymouth and Portland (council page), and list 79 in West Dorset (council list).
A National Landscape doesn't stop roof panels on a pitched roof: they stay permitted development. Two things do change. On a flat roof in a National Landscape, conservation area or World Heritage Site, you must apply to the council before work starts, so it can decide whether it needs to approve how the panels will look (GPDO Part 14, Class A, A.2(ba)). And in a conservation area, panels can't go on a wall, balcony or roof enclosure facing a road. A listed house always needs consent.
The council lists 57 Article 4 directions (council list). Most cover named plots of land. Some cover conservation areas, including Swanage, Wareham, the Piddle Valley, Iwerne Minster, Milton Abbas and Dorchester; Dorchester's is limited to gates, fences and walls next to a road or open space (council notice). If your house is in one of the others, read that direction before you commit.
The Jurassic Coast World Heritage Site rarely affects a home. Its boundary runs along the top of the cliffs or the back of the beach, and it leaves out the frontages of Lyme Regis, West Bay, Weymouth and Swanage (site boundary statement). If your home is inside it, the same rules as a conservation area apply.
Connecting to the grid: SSEN (Southern Electric Power Distribution)
Most of Dorset, including Dorchester, Weymouth, Sherborne, Blandford, Shaftesbury, Wimborne and the BCP towns, is on Scottish and Southern Electricity Networks (SSEN), in its Southern Electric area, and the Southern price-cap region used in the tables above. The west of the county is different: Bridport, Lyme Regis, Charmouth and Beaminster (DT6, DT7 and DT8) are on National Grid Electricity Distribution's South West network and in the South West price-cap region (Ofgem), so their unit rate differs a little from the figure above. Either way your installer deals with the network operator, not you, and your electricity supplier is a separate company. Village homes at the end of long rural lines are more likely to need G99 approval or an export limit for a bigger system, so ask early.
For a typical home system the installer handles this. A single-phase installation up to 3.68kW of inverter capacity (16 amps per phase) is connected under the G98 process and the network operator is notified within 28 days of commissioning. Anything larger — including a bigger system, or panels plus a battery whose combined inverter capacity passes that limit — goes through G99, which needs the network operator's approval before installation and can add weeks. Ask your installer which route your design needs and whether an export limit is being applied.
Getting a quote in Dorset
Tell us about your home
Postcode, property type and how you'd pay. Two minutes.
We pass it to one installer
If an accredited (MCS-certified) installer covers your area, we'll pass your enquiry to them, and only them. They can arrange a roof survey and quote.
Judge the quote
Check it against the figures on this page. If it's out of range, you can say no. No obligation at any stage.
How your enquiry is handled
- One installer introduction, fulfilling your request. If an accredited (MCS-certified) installer covers your area, we'll pass your enquiry to them, and only them — not a list of companies.
- No obligation, at any stage. You can say no at any point, including after the survey or the quote, and owe nothing.
- It costs you nothing. An installer may pay Great British Energy a referral fee if you go ahead, and that fee does not change your price.
- We are an independent guide, not an installer. Great British Energy Guide doesn't install anything and isn't the government body of a similar name. Your consent is recorded with the enquiry, as set out in our privacy policy.
Get your solar quote in Dorset
One MCS-certified installer who covers your postcode. Nothing is shared until you submit.
What the quote should show
- The installer's MCS certificate number — needed for a Smart Export Guarantee tariff — and their consumer code (RECC or HIES).
- Named panel and inverter make and model, with quantities, and the MCS performance estimate for your roof in kWh a year. Every saving quoted to you should come from that estimate.
- Scaffolding stated as included or excluded, and any battery priced as a separate line.
- No VAT added on a home installation (0% until 31 March 2027), warranty terms split out, and, if financed, the total repayable next to the cash price.
The full checklist is on the solar quotes page.
Questions from Dorset homeowners
Is Dorset good for solar panels?
Yes. On PVGIS data a south-facing roof at Dorchester makes about 11% more per kW a year than the same roof in London, and east- or west-facing roofs still make about four-fifths of a south-facing one. How much you save depends mostly on how much of the output you use yourself.
Do I need planning permission for solar panels in the Dorset National Landscape?
Not usually for panels on a pitched roof of a house. For panels on a flat roof there you must first apply to the council to decide whether it needs to approve their appearance, and a listed house always needs consent. In a conservation area, panels on a wall facing a road need permission.
Can I put solar panels on a thatched cottage?
Not on the thatch itself. The usual options are a garage or outbuilding roof, or a small ground-mounted array, which has its own size and siting limits. If the cottage is listed, ask the council before anything goes in its grounds.
Is there a solar group-buy in Dorset?
Dorset Council backs Switch Together Dorset, but registration for the 2026 round closed on 25 September 2026, with installs due to finish by the end of June 2027. Switch Together offers a sign-up for news of the next round.
Who connects solar panels to the grid in Dorset?
SSEN for most of the county, and National Grid Electricity Distribution for Bridport, Lyme Regis, Charmouth and Beaminster. Your MCS installer notifies or applies to the right one; you don't need to contact it yourself.
Does this page cover Bournemouth and Poole?
You can ask for a quote from a BCP postcode, and the output and cost figures are close. The census figures and planning notes here are for the Dorset Council area; Bournemouth, Christchurch and Poole Council sets its own planning guidance.
Other areas
- Solar in Birmingham
- Solar in Newcastle
- Solar in Manchester
- Solar in Bristol
- Solar in Sheffield
- Solar in Doncaster
- Solar in Nottingham
- Solar in Cornwall
- Solar in Aberdeen
- Solar in Cambridge
- Solar in Cardiff
- Solar in Derby
- Solar in Devon
- Solar in Edinburgh
- Solar in Essex
- Solar in Glasgow
- Solar in Hull
- Solar in Kent
- Solar in Leeds
- Solar in Leicester
- Solar in Liverpool
- Solar in London
- Solar in Norfolk
- Solar in Telford & Shropshire
Heat pump pages: Birmingham, Bristol, Newcastle, Nottingham, Sheffield, Doncaster, Norfolk, Suffolk, West Wales, and all heat pump quotes.
Solar for a shop, office, farm or factory instead? See commercial solar panels and the business energy audit guide.
Sources
- European Commission JRC, PVGIS 5.3 — grid-connected PV, Dorchester, 1kWp crystalline silicon, 35° slope, 14% system loss, south/east/west, SARAH3 2005–2023; queried 30 October 2026.
- Office for National Statistics, Census 2021 tables TS044 (accommodation type), TS046 (central heating), TS050 (bedrooms) and TS054 (tenure), local authority level, via Nomis.
- DESNZ, Solar PV cost data, updated 28 May 2026 — domestic, mean cost per kW, Total Installed Capacity basis, 2025/26 (Official Statistics in development).
- Ofgem, Changes to energy price cap between 1 October and 31 December 2026 (26 August 2026) and regional unit rates and standing charges; electricity at 0% VAT from 1 October 2026 to 31 March 2027 (HMRC).
- Ofgem, Smart Export Guarantee: tariffs must be above zero; suppliers with 150,000+ domestic customers must offer one. Supplier export rates checked on supplier websites, 23 September 2026.
- HMRC, VAT Notice 708/6: 0% on installing energy-saving materials in homes, 1 May 2023 to 31 March 2027.
- Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2 Part 14 Class A, as amended to 27 August 2026.
- Network connection thresholds (G98 up to 16A per phase — 3.68kW single-phase; larger systems G99): SP Electricity North West; find your operator via the Energy Networks Association.
- Dorset Council, natural and historic environment data, conservation areas, West Dorset conservation areas, Article 4 directions, Dorchester Article 4 direction and Switch Together; Switch Together, council and community partners (checked 30 October 2026).
- Devon County Council, Dorset and East Devon Coast World Heritage Site: statement on the boundaries; Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2 Part 14 (as amended to 27 August 2026) (checked 30 October 2026).
- Ofgem, price cap rates by region; network areas checked by postcode on the industry grid supply point lookup (30 October 2026).