Define the system and site requirements
Decide whether you are comparing rooftop generation, battery storage or another system and gather recent electricity-use information. Ask a qualified installer to assess the roof, switchboard, shading, access, equipment and network requirements for the actual property.
Verify installer and electrical credentials
Ask who designs and performs each part of the work, which current accreditation, electrical licence and insurance apply, and how to verify them with the relevant regulator or industry body. Do not treat a company name, online ranking or a cleaning-business credential as proof of solar or electrical competence.
Compare complete, current quotes
Ask for system components, capacity assumptions, design, installation, approvals, grid-connection steps, monitoring, warranties, exclusions, payment schedule and ongoing service in writing. Compare like-for-like equipment and scope; no generic payback period, bill reduction or yield estimate is reliable for every Sydney roof.
Check approvals and network process
Confirm the installer will explain any required council, strata, building, electrical or electricity-network steps for the property. Verify current requirements with the relevant NSW or local authority and network provider; do not assume permission is automatic.
Review the decision independently
Keep the dated proposals, product documents, credential checks, approvals and assumptions. Ask an independent energy or financial adviser about performance or return claims, and a qualified roof professional about structural questions.
