Solar panels for warehouses in Southampton
The economics of a Southampton rooftop array turn on how much of the generation the occupier uses on site. The survey measures the roof, not the postcode: cladding profile, purlin centres, remaining sheet life and the load the frame can take.
950 kWh per kWp a year at this latitude, so a 500 kWp array models at about 475,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Book a roof survey in SouthamptonIllustrative layout for a unit of this size. Your own figures come from the roof survey.
Warehouse rooftop solar across Hampshire
What a roof in Southampton actually generates
Modelled irradiation at this latitude is 1221 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 950 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That is around 7 percent above the mean across the towns we cover, which is as good as UK rooftop gets outside the south coast.
Distribution stock around Southampton clusters on M27 J3, M271 and A33, which is where the large single-let roofs are.
Most of the units we look at here sit in the SO postcode area.
Southampton is the planning authority for most sites here, and the built-up area holds a population of about 249,620, the size that tends to be served by mid-box last-mile units rather than national hubs (ONS Census 2021 built-up areas).
Southampton ranks 3 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 500 kWp array that is about 42,000 kWh a year between the strongest and weakest town in the county.
Solar already consented near SO17
From the government's Renewable Energy Planning Database, Q1 2026. These are the schemes on record in this postcode district, which is a fair guide to how the local network has been treating export applications.
| Scheme | Operator | Capacity | Mounting | Status |
|---|---|---|---|---|
| Grosvenor House & Belmont House, Portswood Road - Solar Panels | Nanopro-Tech | 0.16 MW | Roof | Awaiting Construction |
Grid connection through Scottish and Southern Electricity Networks
Connections around Southampton are handled by Scottish and Southern Electricity Networks, 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 warehouse uses most of what the roof makes during the working day.
Across Hampshire the planning database records 237 solar schemes totalling 1634 MW, of which 51 are operational (REPD Q1 2026).
Send us the postcode
Tell us where the unit is and roughly how big the roof is. 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 Southampton
- How much does a warehouse roof in Southampton generate?
- The model gives 950 kWh for every kWp installed here, so 500 kWp comes out at about 475,000 kWh a year before any shading losses. You need roughly 1,485 sqm of clear roof to fit it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
- Does the grid around Southampton have capacity?
- Scottish and Southern Electricity Networks is the distribution network operator for Hampshire. Anything above 3.68 kW per phase connects under G99, and the application sets the export limit. We submit it as part of the design.
- Is planning permission needed for panels on a Southampton unit?
- Usually permitted development covers it. We still put the question to Southampton before design sign-off, and we tell you early if a full application is needed rather than discovering it late.