Common hidden cost categories
Roof condition and repairs: If your roof is old or needs patching, installers may delay work or add a charge to replace shingles or reinforce rafters. Don’t accept a vague “we’ll handle it”—get a written scope and price. Electrical upgrades: Homes often need panel upgrades, new wiring, or meter changes to meet local code or handle a battery. Those upgrades can be a separate line item on the final bill. Permits, inspections and utility fees: Municipal permits, inspection fees and utility interconnection charges can appear after a quote. Ask who pays them and whether they’re included. Site-specific labor and access costs: Steep roofs, multiple roof levels, or limited parking for trucks raise labor time. That shows up as higher labor or scaffolding fees. Monitoring, maintenance and service contracts: Some proposals include ongoing monthly fees for monitoring or service. Clarify what’s included and for how long. Battery systems and backup hardware: Adding storage is a significant cost add-on. If you’re quoted a battery later in the process, compare the incremental price and the installer’s service plan. Removal, relocation and future roof work: If you need roof work later, removing and reinstalling panels has a cost. Ask who pays and how removal is handled.
How installers present prices — what to compare
Get itemized quotes that let you compare like with like. Key line items to match across bids: - System size (kW) and whether it’s stated as DC or AC capacity. - Panel make and model plus expected degradation rate or performance estimate. - Inverter type and warranty terms. - All labor and hardware: racking, conduit, fasteners, and roof attachments. - Permits, inspection and utility interconnection fees. - Any recurring fees for monitoring or maintenance. - Who will handle warranty claims and how quickly they respond. Also compare the assumed production estimate and the modeling period. Two installers can quote the same kW but predict different annual kWh — those differences affect your value over time. When you get proposals from larger names like Sunrun, SunPower or Sunnova, ask each provider to explain exactly how their price is built and who will be financially responsible for repairs or replacements.
Questions to ask before you sign
Ask for clear, written answers to this checklist: - Is this an ownership sale, lease, or a power purchase agreement? Who legally owns the panels? - What is the complete, all-in price? Ask for taxes, permit fees and any third-party charges to be listed. - Who is responsible for roof repairs now or later, and how are those costs handled? - What warranties apply to panels, inverters and workmanship, and who honors them? - How is expected production calculated and what happens if it underperforms? - Who handles permitting and the utility interconnection application, and are those included? - Will the installer provide proof of local license, insurance and workers’ comp? - What are the payment schedule and cancellation terms? Don’t sign until the contract spells out these items and you’ve gotten at least two other itemized bids for comparison.
Tradeoffs, red flags and what’s reasonable
Tradeoffs are unavoidable. A low upfront price may mean cheaper panels, a shorter warranty or extra fees later. A high price can come with stronger local support or longer workmanship coverage. The key is knowing what you’re buying. Red flags: vague or verbal promises, no itemized quote, refusal to show local license or insurance, pressure to sign immediately, or an installer that won’t put performance or warranty promises in writing. Reasonable practices: an installer who provides a written scope, lists included and excluded items, explains permit and utility steps, and gives a realistic timeline. Comparing proposals from multiple installers—including national names and local companies—helps reveal these tradeoffs.