The average cost of installing a 7. 6kW solar system on your roof is $23,100, and most homeowners pay somewhere between $19,100 and $23,800. This could increase costs by nearly $9,000 for a typical system, making 2025 potentially the last year for maximum savings. Combined with the tax. As a result, solar panels, solar shingles, and battery systems placed in service in 2026 or later are not eligible for the 30% federal tax credit when homeowners own the system. Third-party owned systems (such as solar leases or PPAs) may still qualify under commercial credits, with savings. NLR analyzes the total costs associated with installing photovoltaic (PV) systems for residential rooftop, commercial rooftop, and utility-scale ground-mount systems. Your actual cost depends on your home's energy needs, roof characteristics, location and other factors, all of which we'll break down in. In 2026, most U. 60 per watt (W) before incentives, depending on equipment, roof, and market conditions.