How to Estimate the Wattage-Based Cost of a BIPV Retrofit for Your Home

A homeowner in Denver, Colorado received two quotes for a 7.5 kW solar installation in late 2025. The first was a conventional rack-mounted rooftop system at $2.75/W installed — $20,625 before incentives. The second was a BIPV roof-tile system at $4.20/W installed — $31,500 before incentives. The BIPV quote looked 53% more expensive. But the homeowner’s existing clay tile roof needed replacement within three years at an estimated cost of $18,000. When that avoided roofing cost was subtracted from the BIPV price, the net premium dropped to $13,500 — just $1.80/W. After the 30% federal ITC (claimed before the residential credit expired in December 2025), the BIPV system’s effective cost […]