County directory

Humboldt County ADU rules

Each place name links to that city or county's own ADU page. Places with a 'See our rules summary' button also have our plain-language summary of the local ADU rules, with sources. This page shows California state rules. Each place links to its own page.

Places in Humboldt County

Arcata (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Arcata's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Arcata for local details.
Blue Lake (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Blue Lake's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Blue Lake for local details.
Eureka (opens the government site in a new tab)
Showing California state rules
We don't have Eureka's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Eureka for local details.
Ferndale (opens the government site in a new tab)
Showing California state rules
We don't have Ferndale's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Ferndale for local details.
Fortuna (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Fortuna's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Fortuna for local details.
Rio Dell (opens the government site in a new tab)
Showing California state rules
We don't have Rio Dell's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Rio Dell for local details.
Trinidad (planning page) (opens the government site in a new tab)
Showing California state rules
We don't have Trinidad's own ADU rules on file, so this shows the California state rules that apply across the state. Check with Trinidad for local details.
Unincorporated Humboldt County (opens the government site in a new tab)
Showing California state rules because Humboldt County's local rules may conflict with state law or are being challenged
We show the state rules for a one-ADU limit outside residential zones, special permit areas, a same-owner rule, size caps for attached ADUs without the state minimum, and owner-occupancy rules for junior ADUs in its inland rules; Coastal Zone rules were not reviewed. Check with Humboldt County about how it handles this today.

All counties in the ADU directory