ADU eligibility checker

Can this lot support an ADU?

Enter parcel and project data to screen for ADU eligibility under ROH Chapter 21. Results are a preliminary screen only — not a DPP determination.

Zoning district *

Not sure? Look up by address or browse districts.

Is the property owner-occupied?

YesNo

ROH §21-3.90 requires owner-occupancy for ADU eligibility.

Lot area (sq ft)Primary dwelling floor area (sq ft)

Existing lot coverage (%)

Total covered area (house + garage + covered lanai) ÷ lot area

Proposed ADU floor area (sq ft)

Proposed ADU height (ft)

From average grade to highest point

Existing parking stalls on site

Ready to move forward?

Get a full pre-check on your ADU drawings.

This checker screens eligibility. A pre-check reads your actual plans — setbacks to the inch, coverage table, parking layout, structural notes — and flags what DPP would cite.

Run a pre-check — $199 Zoning calculator

Founding architect rate · first 20 scans