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Roof layout and condition
Discuss orientation, shading, available area and the condition of the covering. Roof windows, chimneys and other obstructions influence the layout. Any necessary roofing repairs should be coordinated with the installation.
Mounting and electrical design
The fixing system must suit the actual roof. Cable routes, inverter location and connection requirements belong in the installation design. Have electrical work assessed and carried out by the appropriate specialist.
Access and future maintenance
Agree safe access for installation and later inspection. Keep drainage and relevant roof details accessible. Record equipment locations and product information for future roof work.
Compare realistic proposals
Compare the same panel and inverter specifications, installation scope and assumptions about use. Treat forecasts as estimates rather than guaranteed savings. Ask which roof repairs, access provisions and electrical alterations are included.