Commercial solar installers in Dorchester

Key facts

Where businesses are in Dorchester

• Poundbury: The Duchy of Cornwall's mixed use urban extension on the western edge of Dorchester, with starter units and larger grow-on space. A 2025 business survey found over 2,750 people working in 260 businesses there.
• Parkway Farm business site: The Duchy of Cornwall's business site between Middle Farm Way and the Dorchester bypass, where Dorset Council granted permission for 21 new business units in March 2022.

Large employers and sectors with sites here include:

• Healthcare (Dorset County Hospital): Dorset County Hospital NHS Foundation Trust has 3,500 staff working from the main hospital in Dorchester and other sites, providing acute services to about 300,000 people.
• Public administration (Dorset Council): Dorset Council, created in 2019, is based at County Hall in Dorchester.

Large, simple roofs on distribution sheds and modern industrial units are usually the quickest and cheapest to fit. Older mill, factory and workshop buildings can work well too, but often need a structural survey first, and roofs from before 2000 may contain asbestos cement: see asbestos roofs.

Grid connection

Dorchester is served by SSEN Distribution (Southern Electric Power Distribution licence area). Almost every commercial system needs G99 approval from the network operator before it is switched on, and the question is usually how much the local network can take back. Where export is limited, a G100 export limitation scheme can let a larger array connect. See G99 and DNO applications.

Planning in Dorchester

Dorchester follows the national planning rules for England, decided by Dorset council. Rooftop solar on most non-domestic buildings is permitted development, within height and edge limits, and systems above 50 kW need a prior approval application covering design and glare.

Points that come up locally:

• Businesses at Poundbury are bound by the Poundbury Stipulations and the Design and Community Code, overseen by the Duchy of Cornwall as Regulator, so roof panels there need the Regulator's advice as well as any planning consent.

Our planning permission guide sets out the rules.

What a business roof in Dorchester could generate

Modelled with PVGIS for the town centre, a south-facing roof at 30 degrees produces about 1,117 kWh per kWp a year.

Illustrative, not a quote: the same sums as our commercial solar calculator. A company paying corporation tax can usually shorten the payback with capital allowances.

Funding and support

We found no council or regional grant for business solar open in Dorchester at the time of writing (November 2026). National reliefs still apply, such as capital allowances and, in England, the business rates exemption for onsite renewables: see grants and reliefs in England.

Solar across Dorset

At the end of 2025, Dorset had 17,135 solar PV installations with 476.0 MW of capacity, up 71% since 2020, according to government figures. The Dorset page has the full local figures and how they compare.

Nearby towns

• Weymouth, about 7 miles away
• Bridport, about 14 miles away
• Yeovil, about 18 miles away
• Poole, about 20 miles away

Sources

• ons.gov.uk: census2021
• ons.gov.uk: datadownload.xlsx
• poundbury.co.uk: working
• poundbury.co.uk: business space
• hellorayo.co.uk: jobs hope expansion dorchester business park
• dchft.nhs.uk: about us
• en.wikipedia.org: Dorset Council (UK)
• dorsetlep.co.uk: boost for business as dorset green gains enterprise
• gov.uk: enterprise zones
• poundbury.co.uk: design code covenant
• Yield: PVGIS 5.3 (European Commission Joint Research Centre), SARAH3 data, 14% system losses, for the town centre, modelled 4 November 2026.
• Council area figures: DESNZ, renewable electricity by local authority 2014 to 2025.