What does the ADU ROI Calculator calculate?

Estimate accessory dwelling unit return on investment from project cost, expected rent, operating expenses, vacancy and estimated resale value added.

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.

How to Use the ADU ROI Calculator

Learn how to use the ADU ROI Calculator, check its formula and interpret the result.

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How to use this calculator

Open the ADU ROI Calculator, enter current figures and review every assumption before using the result. Supporting outputs show how the estimate was produced.

Formula

The calculator uses transparent arithmetic based on the values entered. It does not silently insert a lender quote, tax rule, contractor price, market forecast or legal conclusion.

Worked example

Use current project quotes, realistic rent, vacancy and operating costs. The calculator separates rental yield from an optional estimate of property value added.

Before acting on the result

Check dates, units, rates and costs. Compare multiple scenarios and obtain current professional advice where the decision is material.

Limitations

This calculator is educational and for planning. It is not financial, investment, tax, legal, lending, appraisal, construction or real-estate advice.

Related Guides

Frequently Asked Questions

What does the ADU ROI Calculator calculate?: Estimate accessory dwelling unit return on investment from project cost, expected rent, operating expenses, vacancy and estimated resale value added.
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.

Last updated 7/21/2026