Roof constraints that matter for San Francisco homes
Roof condition and shape often determine whether a system will be cost-effective and how long the installation takes. Ask whether your roof needs repairs or replacement first, because pulling shingles or adding mounts on an old roof can add time and expense. Pay attention to roof material: clay or slate tiles, metal, and some shingles require different mounting methods. Shading from chimneys, vents, nearby trees, or taller neighboring buildings reduces usable panel area. Also check usable square footage: narrow or chopped-up roof planes and many penetrations (skylights, vents) can limit how many panels fit. Finally, if your home is in a historic district or has unusual architecture, extra approvals or specialized flashing work might be needed.
Permits, inspections, and utility interconnection
Permitting and inspections often take longer than installation days. In San Francisco you’ll need building permits and a utility interconnection agreement before you can run panels on grid-tied systems — installers usually handle permit filing, but confirm who is responsible and who pays fees. Ask each company for the typical permit timeline they’ve experienced in your neighborhood and what happens if approvals are delayed. You should also confirm who will manage the electrical inspection and the utility meter upgrade or meter reprogramming, since utilities can require additional paperwork or hardware. Finally, check whether your project will require an environmental review, planning approval, or special neighborhood notices.
How to compare companies and quotes (what to look for)
Compare more than price. At a minimum, ask each installer for: a site-specific production estimate (based on your roof and usage), a breakdown of equipment and inverter brand or type, who will handle permits and inspections, and a clear timeline with milestones. Check licensing, proof of insurance, and local references — installers who know San Francisco permitting tend to move projects more smoothly. National firms such as Sunrun, SunPower, and Sunnova may offer standardized processes; local installers may offer deeper local permitting experience. Make sure proposals explain ownership (cash, loan, lease, or power agreement), and review any transfer, cancellation, or change-order terms before you sign.
The checklist: what to verify before signing anything
Before you sign, confirm these items in writing: who is responsible for permits and fees; whether a roof repair or replacement is required and who pays; a production estimate tied to your actual roof layout; exact equipment make and model; warranty and who services it (manufacturer versus installer); the project timeline with key dates; what happens if the city or utility delays approval; proof of license and insurance; and contract terms for cancellations or changes. Also ask for a copy of the permit once it’s pulled and for the final interconnection approval before full payment. If a quote mentions credits, rebates, or tax incentives, verify that eligibility depends on your address, utility account, and final system design.