Accessory Dwelling Units
Accessory Dwelling Units, or ADUs, are also referred to as granny flats, mother-in-law units, backyard cottages, secondary units, and other common informal terms. An ADU is an attached or detached residential dwelling unit which provides complete independent living facilities for one or more persons.
Ferndale ADU Informational Handout Ferndale ADU Handout info sheet
Ferndale ADU Application Worksheet Ferndale ADU Application Worksheet_2023
Additional Resources
Humboldt County Resources:
| Organization Name | Website | Email/Phone Number | Links |
|---|---|---|---|
| Humboldt ADU | www.humboldtadu.org | planningbuilding@co.humboldt.ca.us 707-445-7541 | ADU Cost Calculator ADU Guidebook Hub of ADU resources and information for the County |
| Humboldt County Planning and Building Department | humboldtgov.org/3318/ADU-Approved-Standard-Plans | planningbuilding@co.humboldt.ca.us 707-445-7541 | ADU Approved Standard Plans |
California Resources
| Organization Name | Website | Email/Phone Number | Links |
|---|---|---|---|
| California Department of Housing and Community Development | www.hcd.ca.gov/policy-and-research/accessory-dwelling-units | adu@hcd.ca.gov 916-263-2911 | ADU Information ADU Handbook Contact us for assistance |
| California Energy Commission | www.hcd.ca.gov/policy-research/docs/CEC-Blueprint-Newsletter-129.pdf | title24@energy.ca.gov | 2019 Energy Code, PV Requirements for ADUs |
| American Association of Retired Persons (AARP) | www.aarp.org/livable-communities/housing/info-2019/accessory-dwelling-units-adus.html | caaarp@aarp.org 866-448-3614 | The ABCs of ADUs, guide to ADUs The ABCs of ADUs, presentation on the guide |
| Casita Coalition | www.casitacoalition.org/adu-resources | info@casitacoalition.org | ADU Best Practices Guidebook, 2021 Webinar Series Summary |