Initial contact and basic info check
Most companies reach out within a few days to confirm details. Expect a short phone or video call where they ask for your address, recent utility bills and any roof photos you have. Share your electric bill (12 months is ideal) and note anything unusual—roof repairs needed, plans to add an EV charger, or roof-mounted equipment. Some companies, including larger installers you may have heard of like Sunrun or Momentum Solar, will offer a quick virtual assessment based on satellite imagery before scheduling a site visit.
Site assessment and system design
Next comes the site assessment. That can be an on-site visit or a more detailed remote survey. The assessor checks roof pitch, age, shading from trees or nearby structures, roof orientation, and where panels and inverters would go. They’ll also review the electrical panel and any local permitting rules. This step is where a generic online price often changes: an old roof, unexpected shading, or a complex roofline can increase labor and material needs. Expect the designer to produce a rough system size and a production estimate tailored to your roof and location.
Formal proposal: what to compare
You’ll receive a written proposal that should include system size (in kW), panel and inverter brands, estimated annual production, a line-item price or financing details, and a proposed timeline. Compare quotes by more than just total price. Look at the estimated energy production, panel efficiency, inverter type, mounting method, who handles permits and inspections, and how the installer models production against your actual usage. Also note which warranties are offered and whether they’re backed by the installer, the manufacturer, or both. Different companies may present the same system differently, so ask for clarifications and equivalent equipment when you compare.
Permits, approval, installation and final steps
If you accept a proposal, the installer usually starts permit applications and any required utility interconnection paperwork. Financing approvals or loan documents happen during this phase if you chose a loan or lease. Once permits are issued and paperwork cleared, the installer schedules work—installing racking, panels and electrical connections. After installation there’s a municipal inspection and the utility must approve interconnection before your system can go live. The total calendar time from signed contract to energized system varies widely. Expect communication from the installer about each step and get clarity on who handles permit fees, potential roof repairs, and final inspections.