About ADUCostGuide

ADUCostGuide exists to answer one question homeowners can't get a straight answer to: what will an accessory dwelling unit actually cost me?

Builder websites quote lowball teaser prices. City documents bury fees across a dozen PDFs. We compile real permit fee schedules, zoning rules, and regional construction cost data into calculators and city guides — updated annually, itemized like a contractor's bid.

How we build our numbers

Cost ranges combine published city fee schedules, state ADU regulations, and regional construction cost indexes for 2026. They're planning estimates, not bids — always confirm with licensed local contractors before committing to a project.