Tools
Plan an ADU with official numbers
Each tool runs on the same sourced fee data and hands your inputs to the next one: check what you can build, itemize the fees, add construction, then see how long rent takes to pay it back.
- Can I build an ADU?What state law guarantees on your lot, section by section.
- Fee calculatorYour city’s permit, impact and school fees, line by line.
- Total costFees plus construction and utility work.
- Rent & paybackHUD rents and years to pay back.
- Compare citiesFee totals side by side at four sizes.
- Fee changesHow ADU fees changed between adopted schedules.
Dollar amounts you type stay in your browser: never in the URL or analytics. How the numbers work →