Multigenerational Additions Cost $120K-$320K in 2026
Building a multigenerational addition in 2026 costs $120,000–$320,000, depending on size, materials, and site complexity. Professional builds boost property value up to 30 percent, while smart timing and planning can cut expenses. Explore detailed cost tiers, DIY comparisons, and strategies to maximize comfort, equity, and long-term family flexibility.



















