Commercial building solar panels in Newtown
Most commercial roofs around Newtown already carry plant, a parapet and an access hatch, and the space between them is where the array goes. The survey starts with the membrane and the deck: how many years the covering has left, what the roof can carry in ballast, and where plant and its shade rule panels out.
820 kWh per kWp a year at this latitude, so a 210 kWp array models at about 172,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in NewtownIllustrative layout for a flat commercial roof of this size, with plant, shade and access kept clear. Your own figures come from the roof survey.
- 10,885
- people in the Newtown built-up area (ONS Census 2021)
- 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)
Commercial rooftop solar across Powys
Yield on a Newtown commercial roof
Modelled irradiation here is 1,045 kWh per square metre a year on a low-tilt array, which works out at 820 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is about 7 percent below the mean across the towns we cover, so the case here rests more on daytime consumption than on raw generation.
How many commercial buildings Powys has
On the Valuation Office Agency's count, Powys holds 1,410 retail and 890 office properties on the rating list. 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.
The built-up area holds about 10,885 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 SY postcodes, SY16 outward.
Newtown ranks 6 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 Newtown 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 Newtown
- What would a 210 kWp array produce in Newtown?
- Yes. At 820 kWh per kWp a year, a 210 kWp array on a Newtown roof models at around 172,000 kWh. What changes the answer is how much of that the building uses during opening hours rather than exports. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Is planning permission needed for panels on a Newtown office or shop?
- Wales has its own permitted development rules for non-domestic roofs (Part 43 of the Welsh GPDO). Since April 2019 there is no output limit and no prior approval step, but the right does not apply within 3 km of an airport or aerodrome, on a wall or roof slope fronting a highway in a conservation area, National Park, AONB or World Heritage Site, or on a listed building or its curtilage. 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. We confirm the route with Powys before the design is fixed.
- Will rooftop solar improve the EPC rating of a let building in Newtown?
- 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 Newtown 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.