How much does solar installation cost in 2026?

The average residential solar installation costs $2.50–$3.50 per watt before incentives. A typical 8 kW system runs $20,000–$28,000 before state rebates and other incentives. Note: the federal residential ITC (Section 25D) expired December 31, 2025. Final cost varies by state, roof type, equipment tier, and installer. Getting 3+ quotes is essential since prices vary 20–30%.

What's included in a solar installation quote?

A complete solar quote includes: equipment (panels, inverter, mounting hardware), labor for installation, permitting and inspection fees, utility interconnection fees, and system monitoring. Some quotes include battery storage. Look for a 10-year workmanship warranty and ensure the installer is licensed and insured in your state.

How much does a solar installation cost in 2025?

The average residential solar installation costs $2.50–3.50 per watt before incentives, or $21,000–30,000 for a typical 8.5 kW system. After the 30% federal ITC (for 2025 installations) and any state incentives, net cost is typically $15,000–22,000. Prices vary by location, system size, panel brand, and installer pricing.

Why do solar installation costs vary so much?

Key cost drivers include location (labor costs vary 30–50% by region), roof complexity (steep or complex roofs increase labor), panel brand and efficiency (premium brands cost 20–40% more), inverter type (microinverters cost more than string inverters but offer better performance in shaded conditions), and installer margins (getting 3+ quotes can save $3,000–6,000).

Solar Installation Cost Calculator

Estimate your net out-of-pocket cost for a residential solar installation after state incentives and permit fees. Know exactly what you will pay before signing any contract.

System Size (kW)

Cost per Watt ($)

State Solar Credit

Federal Tax Credit (%)

About This Calculator

The Solar Installation Cost Calculator reveals the true out-of-pocket price of going solar after stacking all available incentives. The national average installed cost of solar in 2025 runs roughly $2.50–$3.50 per watt before incentives, putting an 8 kW system at $20,000–$28,000 gross. State incentives, utility rebates, and local programs can reduce that figure — verify what's available in your state at dsireusa.org. Note: the federal residential ITC expired December 31, 2025. This calculator makes that arithmetic immediate and transparent so you can evaluate quotes with confidence.

Cost per watt is the most useful benchmark for comparing installer quotes — lower is generally better, but an unusually low price per watt may signal cheaper equipment or hidden fees. Permit and inspection fees are often bundled into quotes but run $500–$2,500 depending on system size and local jurisdiction. State incentives vary dramatically: New York offers a 25% state tax credit (capped at $5,000), while other states provide upfront utility rebates worth $200–$1,500 per installed kilowatt. The calculator separates these so you see exactly where savings come from.

For accurate inputs, gather itemized quotes from at least three licensed installers. Ask each to break out equipment, labor, permit fees, and inverter costs separately. The cost per watt you enter should be total installed cost divided by system wattage — not just panels. For state incentives, visit your state energy office website or search the DSIRE database at dsireusa.org for current program availability and caps. The federal residential ITC (Section 25D) expired December 31, 2025. Commercial installations may still qualify under Section 48E through 2027 if construction begins by July 4, 2026.

Net installation cost is the foundation of every solar financial calculation — your payback period, ROI, and monthly loan payment all depend on getting this number right. Even a $1,000 difference in quoted price per watt adds up to $8,000 on an 8 kW system, so comparing multiple quotes pays dividends before you commit.

Calculations based on NREL solar modeling data and industry-standard assumptions, built and maintained by the independent SolarToolsOnline research team.

Estimates only — not financial, tax, or legal advice. Verify important results with a licensed solar installer or financial professional before making decisions.