The cost includes structure, finishes, permits, and installation time, with price variations by region and season. This article presents cost ranges in USD and gives clear per-unit notes to aid budgeting. Assumptions: region, sunroom size, building code. Homeowners typically pay a broad range for sunroom projects, driven by size, materials, foundation needs, and local labor. System Size Matters More Than You Think While bigger systems have higher absolute costs, they offer better value through economies of scale. Here are 2025 average costs across major markets: Example: A typical 6 kW residential system costs between $15,000 and $36,000 before incentives, depending on your location and chosen components.