Commercial building solar panels in Portsmouth
Commercial roofs in Portsmouth tend to be flat, membrane covered and cluttered with plant, which shapes the layout more than the size does. We check the covering and the lease together, because a roof with eight years of membrane left and a tenant with a break in three changes the answer.
987 kWh per kWp a year at this latitude, so a 210 kWp array models at about 207,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in PortsmouthIllustrative layout for a flat commercial roof of this size, with plant, shade and access kept clear. Your own figures come from the roof survey.
- 223,305
- people in the Portsmouth built-up area (ONS Census 2021)
- 930
- office properties on the rating list in Portsmouth (VOA, March 2025)
- 1,990
- retail properties, 60 of them large-format (VOA, March 2025)
- 2
- named commercial rooftop schemes on the planning record nearby (REPD, Q1 2026)
Commercial rooftop solar across Hampshire
Yield on a Portsmouth commercial roof
Modelled irradiation here is 1,265 kWh per square metre a year on a low-tilt array, which works out at 987 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 11 percent above the mean across the towns we cover.
How many commercial buildings Portsmouth has
On the Valuation Office Agency's count, Portsmouth holds 1,990 retail and 930 office properties on the rating list. By office stock the district sits above 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.
The big roofs are in the 60 large-format retail units, superstores and retail warehouses in the district, about 167,000 square metres of floorspace under largely single storey roofs.
The same list carries 350 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.
Commercial rooftop solar already planned near Portsmouth
The Renewable Energy Planning Database records 2 roof-mounted schemes on public sector buildings in this postcode district. These are other organisations' projects, listed from the public record, not ours.
| Scheme | Applicant | Type | Capacity | Status |
|---|---|---|---|---|
| Portsmouth International Port | Portsmouth City Council | civic | 1.2 MW | Under Construction |
| Mountbatten Centre, Twyford Avenue | Portsmouth City Council | civic | 0.27 MW | Awaiting Construction |
The built-up area holds about 223,305 people, large enough for a retail park or two and a cluster of office buildings (ONS Census 2021 built-up areas).
We arrange surveys across the PO postcode area, starting from PO2.
Portsmouth ranks 1 of 10 towns we cover in Hampshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 903 to 987, a spread of 84 kWh per kWp. On a 210 kWp commercial roof that is about 17,640 kWh a year between the strongest and weakest town in the county.
Grid connection through Scottish and Southern Electricity Networks
Scottish and Southern Electricity Networks is the network operator here, and their answer on export capacity shapes the design. Any commercial array above 3.68 kW per phase connects under G99 rather than G98, and the application fixes what you are allowed to push back onto the network. If the local network is tight, limiting export rarely breaks the case here: most of the generation is consumed on site while the building is working.
Across Hampshire the planning database records 237 solar schemes totalling 1634 MW, of which 51 are operational (REPD Q1 2026).
All solar on record near PO2
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 |
|---|---|---|---|---|
| MMD Shipping Services | EvoEnergy | 1.2 MW | Roof | Operational |
| Portsmouth International Port - Solar Panels | Portsmouth City Council | 1.2 MW | Roof | Under Construction |
| Mountbatten Centre, Twyford Avenue - Solar Panels | Portsmouth City Council | 0.27 MW | Roof | Awaiting Construction |
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 Portsmouth
- Is there enough sun in Portsmouth for a commercial roof array?
- Modelled at 987 kWh per kWp a year for a low-tilt array at this latitude, a 210 kWp system comes out at roughly 207,000 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.
- Do we need planning permission for solar on a commercial building in Portsmouth?
- 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 Portsmouth 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.
- Does solar help a Portsmouth landlord meet MEES?
- 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.
- Which network operator handles the connection in Portsmouth?
- Capacity varies street by street and only Scottish and Southern Electricity Networks can answer it for your connection. We ask early, because an export-limited offer changes the design rather than ending the scheme, and most commercial buildings use most of what they generate anyway.