Installing photovoltaic panels in a sunroom typically costs between $15,000 and $40,000, depending on size, materials, and local regulations. But here's the kicker: this investment can reduce your monthly electricity bills by up to 80% while boosting property value. Let's break. Meta Description: Discover the average photovoltaic panel sun room installation price, factors affecting costs, and how solar sunrooms can slash energy bills. Get expert insights and data-driven comparisons. Your actual cost depends on your home's energy needs, roof characteristics, location and other factors, all of which we'll break down in. How much do solar panels cost on average? As of 2026, the average cost of residential solar panels in the U. This typically translates to about $2. Data source: IRENA (2025); Nemet (2009); Farmer and Lafond (2016) – Learn more about this data Note: Costs are expressed in constant 2024 US$ per watt. Global estimates are used before 2010; European market. Over the last ten years, the cost of installing solar panels has decreased by over 45% 1, fueling growth across new markets and deploying thousands of systems across the country. The upfront price for an average-sized residential solar system has fallen from $40,000 in 2010 to about $25,000 today.