How to Use the ADU Financing Calculator
Learn how to use the ADU Financing Calculator, check its formula and interpret the result.
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How to use this calculator
Open the ADU Financing 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
Enter a project estimate, loan terms and upfront costs to compare financing scenarios. Taxes, insurance and lender-specific fees are not included unless entered.
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.
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Frequently Asked Questions
- What does the ADU Financing Calculator calculate?
- Estimate an ADU loan payment, total interest and required cash using project cost, down payment, annual interest rate, term and closing costs.
- 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