Commercial building solar panels in Falmouth
Most commercial roofs around Falmouth already carry plant, a parapet and an access hatch, and the space between them is where the array goes. Each survey records the usable area once edge strips, plant and walkways are taken out, the load the deck can take, and whether the lease lets the occupier alter the roof.
943 kWh per kWp a year at this latitude, so a 210 kWp array models at about 198,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in FalmouthIllustrative layout for a flat commercial roof of this size, with plant, shade and access kept clear. Your own figures come from the roof survey.
- 24,070
- people in the Falmouth built-up area (ONS Census 2021)
- 2,980
- office properties on the rating list in Cornwall (VOA, March 2025)
- 5,750
- retail properties, 160 of them large-format (VOA, March 2025)
- 0
- named commercial rooftop schemes on the planning record nearby (REPD, Q1 2026)
Commercial rooftop solar across Cornwall
Yield on a Falmouth commercial roof
Modelled irradiation here is 1,203 kWh per square metre a year on a low-tilt array, which works out at 943 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 6 percent above the mean across the towns we cover.
How many commercial buildings Cornwall has
On the Valuation Office Agency's count, Cornwall holds 5,750 retail and 2,980 office properties on the rating list. By office stock the district sits in the top tenth of the 318 districts in England and Wales; by retail stock it sits in the top tenth of the 318 districts in England and Wales.
160 of those retail properties are superstores, large food stores, large shops or retail warehouses, together about 418,000 square metres. Single storey boxes of that size are where most commercial rooftop solar actually gets built, because the roof is big, flat or shallow, and uninterrupted.
The same list carries 1,890 hotel, leisure and assembly properties in the district. Leisure centres and hotels run seven days a week, which puts weekend generation to use that an office would export.
Source: Valuation Office Agency, Non-domestic rating: business floorspace, 31 March 2025 (published December 2025), counts and floorspace by special category code and local authority district, England and Wales.
The built-up area holds about 24,070 people, so the stock here runs to high street premises, a supermarket or two and the odd hotel (ONS Census 2021 built-up areas).
Surveys run across TR postcodes, TR11 outward.
Falmouth ranks 2 of 8 towns we cover in Cornwall on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 921 to 979, a spread of 58 kWh per kWp. On a 210 kWp commercial roof that is about 12,180 kWh a year between the strongest and weakest town in the county.
All solar on record near TR11
Every scheme in this postcode district in the government's Renewable Energy Planning Database, Q1 2026, ground and roof mounted, commercial or not. None of them is ours. Together they are a fair guide to how the local network has been treating export applications.
| Scheme | Operator | Capacity | Mounting | Status |
|---|---|---|---|---|
| LITTLE TREVEASE SOLAR PARK | Private Developer | 5.3 MW | Ground | Operational |
| Higher Tregarne Solar Farm | John Laing Environmental Assets | 5 MW | Ground | Operational |
| Watson Marlow, Bickland Water Road - Solar Pv Panels | Watson Marlow Limited/Bio Pure Technology | 0.34 MW | Roof | Awaiting Construction |
Grid connection through National Grid Electricity Distribution
National Grid Electricity Distribution operates the distribution network across Cornwall, so the export application goes to them. Anything larger than 3.68 kW per phase falls under G99, which means an application before commissioning rather than a notification afterwards. A constrained network is not the end of a scheme. Capping export costs little when the building already absorbs most of what the roof produces.
Across Cornwall the planning database records 174 solar schemes totalling 1116 MW, of which 88 are operational (REPD Q1 2026).
Send us the postcode
Tell us where the building is, roughly how big the roof is, and whether you own it or lease it. We come back with what it can carry, what it would generate against your consumption, and the three ways to pay for it.
Lenzie Consulting Ltd arranges the survey and passes your details to our MCS-certified installation partner so they can quote.
Questions about solar in Falmouth
- Is there enough sun in Falmouth for a commercial roof array?
- Modelled at 943 kWh per kWp a year for a low-tilt array at this latitude, a 210 kWp system comes out at roughly 198,000 kWh a year before shading. It needs about 1,390 m² of flat roof once the edge strip, plant and walkways are kept clear. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Is planning permission needed for panels on a Falmouth office or shop?
- Usually not a full application. In England, panels on the roof of a non-domestic building are permitted development under Class J of Part 14 of the General Permitted Development Order, with no capacity cap since December 2023. Above 50 kW, which covers most commercial arrays, you must first apply to Cornwall for a determination on prior approval of the design and appearance, in particular glare on neighbouring land. On a flat roof panels may stand no more than 1 metre above the roof and must sit at least 1 metre from its edge, and listed buildings and scheduled monuments are excluded. See our planning permission guide for the detail.
- Will rooftop solar improve the EPC rating of a let building in Falmouth?
- It can. A non-domestic EPC is an asset rating, and on-site generation counts in the calculation, so an array usually lifts the score. Let property in England and Wales must be EPC E or better today. The government's interim response of 18 June 2026 proposes EPC B, where cost effective, from 2031 for let buildings over 1,000 m², and drops the EPC C step once planned for 2027. How far solar moves a particular building depends on its fabric and services, which is why the EPC assessor models it before anything is fitted.
- Does the grid around Falmouth have capacity for export?
- National Grid Electricity Distribution is the distribution network operator for Cornwall. Arrays above 3.68 kW per phase connect under G99, and the application sets the export limit. It is part of the design work we arrange.