San Francisco, CA

ADU Contractor Tips & Local Guides

Expert advice, cost guides, and local insights from Alpha ADU Solutions — your trusted adu contractor contractor in San Francisco.

Completed adu permitting work at a residential property in San Francisco, CA

Comparisons May 4, 2026 4 min

ADU Permitting: Prefab vs. Site-Built for Your SF Backyard

Thinking about adding an ADU in San Francisco? You've got options for how you get it permitted and built. Let's break down prefab versus site-built ADUs so you can make the right call for your property.