Installed costs in 2026 typically run at £750–£1,000 per kWp. A 100kWp system — around 200–250 panels, suitable for a medium-sized commercial roof — would typically cost £75,000–£100,000 installed. The Annual Investment Allowance means businesses paying 25% corporation tax effectively reduce that cost by 25% in year one. We provide a detailed, no-obligation cost and payback breakdown as part of our feasibility study.

For a straightforward commercial rooftop installation, expect 10–16 weeks from initial feasibility to energisation. The main variable is DNO/G98/G99 approval timescales, which vary between distribution networks and depend on export capacity at your local substation. We manage the application process from day one and flag any potential delays early. We don’t wait until the panels are on the roof to start the grid connection process.

Most commercial rooftop solar installations fall within permitted development rights. Exceptions include listed buildings, conservation areas and installations above certain capacity thresholds. We assess planning requirements during the feasibility stage and give you a clear view of what’s needed before any design work begins. In most cases, it’s not an obstacle.

G98 and G99 are the UK engineering standards that govern how solar — and other generating equipment — connects to the distribution network. Systems up to 3.68kW per phase use a G98 notification; larger systems require a G99 application with formal DNO approval before the system can be legally energised. Missing this step is a compliance risk that we have seen catch other contractors out. We handle all DNO and G98/G99 work as a standard part of every project.

Yes — and in most cases we recommend assessing storage at the same time as solar rather than retrofitting it later. Battery storage shifts surplus generation into the evening peak, reduces demand charges and significantly increases self-consumption. Designing solar and storage together from the outset produces better technical performance and lower lifetime cost than a staged approach. Ask us to include a storage option in your feasibility study.

Every project is handed over with a full documentation pack: NICEIC Electrical Installation Certificate, MCS-aligned project records, G98/G99 compliance evidence, as-built drawings, emergency lighting layouts where applicable, and an O&M manual. Procurement teams, auditors and building managers have everything they need on day one. If you have specific documentation requirements for a framework or contract, tell us at the design stage and we’ll build them in.