For a roof with 10 solar panels, you pay € 4408 to € 5714 on average in 2025, which you earn back within 4 to 6 years.
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Installation costs account for around 20% of the total cost of the project, and the price per square metre of solar panels varies between €200 and €300, depending on the power and technology of the modules chosen.
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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.
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This guide covers everything you need to know about solar costs, including average prices per watt, system size estimates, incentives, regional differences, and payback timelines. As of 2025, the average cost to install solar panels in California is around $2.
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