Tag: 20×20 room addition cost

Room Addition Cost in 2026: Bay Area Pricing and ROI

Home› Tag: 20×20 room addition cost Room Addition Cost in 2026: Bay Area Pricing and ROI Room addition cost in the Bay Area runs $250 to $500 per square foot in 2026, meaning a typical 400-square-foot addition lands around $100,000 to $200,000 — well above national averages because of our elevated labor and material rates. […]