The average cost of solar panels ranges from $2. 50 per watt installed, with most homeowners paying between $15,000 and $35,000 for a complete system before incentives. Your actual cost depends on your home's energy needs, roof characteristics, location and other factors, all of which we'll break down in. If you're researching solar costs in 2025 going to 2026, you need three numbers: the gross installation cost, the net cost after incentives, and the cost per watt (which lets you compare quotes accurately). This guide breaks down exactly what you'll pay for solar in 2025, component by component, so. Solar panels cost about $21,816 on average when purchased with cash or $26,004 when purchased with a loan for a 7. solar cost per square foot in 2025: $6 – $12 after the 30% federal tax credit.