Ballasted Solar on Flat Roofs: How It Works and When It Suits

A ballasted system holds panels on a flat roof with weight instead of fixings, so the membrane is not drilled. It suits most commercial flat roofs if the structure and wind design allow.
Can Your Warehouse Roof Take Solar? 9 Checks Before You Commit

Most modern metal warehouse roofs can take solar. Before ordering kit, check the structure can carry the load, the roof will outlast the panels and the grid will accept the connection.
How Much Do Commercial Solar Panels Cost in the UK?

Most commercial rooftop solar systems cost about £17,000–£21,000 for 30 kWp, £28,000–£37,000 for 50 kWp and £50,000–£65,000 for 100 kWp, excluding VAT.