Prices typically range between $150-$400 per square meter, depending on these variables: "The sweet spot for commercial projects is $220-$280/m² - offering 18-20% efficiency with 25-year performance warranties. " - EK SOLAR Project Manager Why Architects Choose PV Curtain Walls?. Unlike conventional curtain walls, photovoltaic (PV) versions integrate solar cells directly into building facades. Long-Term Investment: Offer energy savings over 30 years, paying for themselves over time. Onyx. . The cost of a curtain wall system can vary widely depending on several factors, but as a general estimate: Standard Glass Curtain Walls: $25 to $75 per square foot. Customized High-End Systems: $200 or more per square foot. All Solar Innovations ® curtain wall frames are custom built to meet the exact dimensions of your opening., Ltd founded in 2001, we are a large comprehensive one-stop service building materials enterprise.