Based on 2025 data from the Solar Energy Industries Association (SEIA) and Department of Energy benchmarks, you're looking at $2. 15 per watt for residential solar installations before any tax credits kick in. What does this mean for your home?. he average cost to install solar panels before tax credit is approximately $29,360 for an 11 kW residential system in 2025, ranging from $2. To estimate your ideal system size, check last year's. . A 7. The credit is not available for any property placed in service after December 31, 2025. But there's a time-sensitive catch that could cost you thousands.
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