More than 90% of suitable commercial roof space in the UK is currently unused for solar generation, representing potential capacity of more than 60GW.
Over 90% of viable commercial roof space across the United Kingdom remains unequipped with solar panels, representing upwards of 60GW in potential generating capacity. Research authored by Cushman & Wakefield—commissioned by Real Estate:UK alongside Push Power Ltd and Forsters—indicates that maximizing this capacity would yield electricity output roughly equal to 20 Hinkley Point C nuclear generating facilities. The findings draw from a survey of 70 property organizations managing a combined portfolio exceeding £500 billion (US$676 billion).
Currently, less than 10% of viable commercial roofs host photovoltaic equipment, supplying between 3GW and 5GW of total capacity. Unlocking the remaining space could deliver over tenfold the power needs forecasted by the UK government for artificial intelligence data facilities through 2030, while simultaneously reducing the need for ground-mounted solar installations on agricultural land. The built environment accounts for 25% of overall greenhouse gas emissions nationwide.
The study outlines a favorable financial model for commercial installations under supportive regulatory framework. For a standard 300kWp system priced at £250,000 (US$337,900), tenant-funded projects achieve a 20% first-year net yield and a 5.5-year investment return timeline. Landlord-financed equivalents produce a 12% first-year net yield with an eight-year payback span, with both setups cutting an estimated 53 metric tons of carbon dioxide equivalent per year. Installing solar also aids property owners in satisfying environmental criteria and protects occupants from energy market price fluctuations.
Progress remains constrained by administrative, structural, and legal hurdles. Issues include lease-funding term misalignments, ambiguities surrounding Real Estate Investment Trust (REIT) provisions and insurance standards, leasing intricacies, grid connection backlogs, limited grid capacity, and policy instability. Despite these factors, 85% of surveyed real estate executives anticipate an increase in commercial roof solar installations over the next two years.
To eliminate these bottlenecks, the report recommends seven targeted policy measures:
Updating REIT tax and regulatory frameworks to encompass renewable generation investments.
Standardizing lease agreements and power purchase agreement terms to decrease project costs and administrative delays.
* Establishing uniform nationwide insurance criteria to prevent project downsizing or cancellations.
* Implementing predictable export pricing structures to stabilize revenues for larger system builds.
* Accelerating grid modernization and expanding regional connection processing speed.
* Clarifying long-term policy mandates, such as Minimum Energy Efficiency Standards.
* Raising the current 50kW permitted development ceiling for pre-approved planning sites.
Real Estate:UK assistant director Rob Wall emphasized that while commercial property owners possess strong interest in deploying rooftop generation, government regulatory changes are necessary to unlock large-scale rollout. Push Power managing director Andy Khan added that pinpointing systemic obstacles serves as an essential precursor to advocating for regulatory adjustments that can activate nationwide commercial solar capacity.
Originally reported by Solar Power Portal on Sep 10, 2026.
