ADU Calculators

Calculators

• ADU Calculator California
  Build a California ADU planning estimate from floor area, construction rate, design and permit allowances, utility work, site work and contingency.
• ADU Financing Calculator
  Estimate an ADU loan payment, total interest and required cash using project cost, down payment, annual interest rate, term and closing costs.
• ADU ROI Calculator
  Estimate accessory dwelling unit return on investment from project cost, expected rent, operating expenses, vacancy and estimated resale value added.

Guides

• How to Use the ADU Calculator California
• How to Use the ADU Financing Calculator
• How to Use the ADU ROI Calculator

Frequently Asked Questions

What does the ADU Calculator California calculate?

Build a California ADU planning estimate from floor area, construction rate, design and permit allowances, utility work, site work and contingency.

Is this result guaranteed?

No. It is a planning estimate based entirely on the assumptions you enter. Actual costs, returns, taxes, rates, regulations and outcomes can differ.

Can I change the assumptions?

Yes. Replace every default or example value with current figures specific to your situation and compare multiple scenarios.

Should I make a financial decision from this result alone?

No. Verify the figures and consult qualified financial, tax, legal, lending, construction or real-estate professionals where appropriate.