Commercial building solar panels in Builth Wells
Whether solar pays on a Builth Wells commercial building depends less on the panels than on who owns the roof and who pays the bill. 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.
830 kWh per kWp a year at this latitude, so a 210 kWp array models at about 174,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in Builth WellsIllustrative layout for a flat commercial roof of this size, with plant, shade and access kept clear. Your own figures come from the roof survey.
- 890
- office properties on the rating list in Powys (VOA, March 2025)
- 1,410
- retail properties, 30 of them large-format (VOA, March 2025)
- 0
- named commercial rooftop schemes on the planning record nearby (REPD, Q1 2026)
Solar PV for commercial property across Powys
What a flat roof in Builth Wells generates
Modelled irradiation here is 1,060 kWh per square metre a year on a low-tilt array, which works out at 830 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 6 percent below the mean across the towns we cover, so the case here rests more on daytime consumption than on raw generation.
Commercial stock in Powys
Powys has 890 office premises and 1,410 shops and other retail premises on the non-domestic rating list, according to the Valuation Office Agency. By office stock the district sits below the median of the 318 districts in England and Wales; by retail stock it sits above the median of the 318 districts in England and Wales.
30 of those retail properties are superstores, large food stores, large shops or retail warehouses, together about 63,000 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 410 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.
Builth Wells ranks 3 of 6 towns we cover in Powys on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 820 to 838, a spread of 18 kWh per kWp. Within Powys that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.
Grid connection through National Grid Electricity Distribution
Connections around Builth Wells are handled by National Grid Electricity Distribution, which sets the export limit for the site. Above 3.68 kW per phase the connection runs under G99, so the export limit is agreed in advance rather than assumed. Where the local network is constrained, an export-limited connection usually still makes the scheme work, because a commercial building uses most of what the roof makes during the working day.
Across Powys the planning database records 18 solar schemes totalling 39 MW, of which 1 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 Builth Wells
- How much would solar on a commercial building in Builth Wells generate?
- The model gives 830 kWh for every kWp installed here, so 210 kWp is about 174,000 kWh a year before shading losses. Allow roughly 1,390 m² of roof for it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Is planning permission needed for panels on a Builth Wells 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 Powys 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 Builth Wells?
- 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 Builth Wells have capacity for export?
- National Grid Electricity Distribution is the distribution network operator for Powys. 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.