Does an ADU pencil out?
Build cost, added value at sale, and rental income if you keep it. A first-pass sanity check — before you pay for architecture.
The build
700 sq ft
$350
15% of hard cost
$400
$2,100
6%
$250
Tight math
-$1,750
equity created day one
Cost (100%)
Added value (99%)
What this isn't
This ignores financing, zoning, utility hookups, and local ADU rules — all of which can swing the numbers meaningfully. Use it to decide whether a real feasibility study is worth it, not as a substitute for one.
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Estimates only. Not an appraisal, tax advice, or lending offer. Checking here never touches your credit.