Free tool

ADU investment calculator.

Quick estimate or advanced mode with vacancy, reserves, utilities and financing. Enter your own numbers; nothing here is a local price.

A small detached accessory dwelling with light wood siding and a dark gable roof beside a gravel path in Oregon.
A detached Oregon ADU. Photo by the Sightline Institute, CC BY 2.0. Not a local cost example.
Front elevation of the Redwood modern ADU, plan number 24001.
Plan drawing by our local design partner. Redwood ADU elevation, plan 24001.

Quick mode assumes 5% vacancy, 5% of rent set aside for maintenance and reserves, no owner-paid utilities and no loan.

Estimate

Enter the total project cost, expected monthly rent, and monthly property tax and insurance.

This doesn't determine whether an ADU is allowed on your parcel. Zoning, lot size, utilities and setbacks decide that. A feasibility review checks them before you spend on design.

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A rough estimate from your inputs, not financial, tax or lending advice. It ignores appreciation, taxes on income, and changes in rent or costs over time.