Humboldt ADU

Humboldt ADU is a homeowner-focused educational resource developed by the Humboldt County Planning & Building Department to help residents understand, plan, and build Accessory Dwelling Units (ADUs) and Junior Accessory Dwelling Units (JADUs) throughout Humboldt County, California. The platform was created to simplify the ADU development process by providing clear guidance on local regulations, permitting requirements, design considerations, costs, financing options, and construction resources. It serves as a centralized hub for homeowners exploring opportunities to add housing, create rental income, support multigenerational living, or increase property value.

Through educational tools, guidebooks, planning resources, and step-by-step information, Humboldt ADU helps property owners navigate every stage of the ADU journey. The program supports Humboldt County’s broader housing goals by encouraging the development of safe, code-compliant accessory dwelling units while making the process more accessible and understandable for local residents.

Services

• ADU Educational Resources
• ADU Planning Guidance
• ADU Development Information
• Junior ADU (JADU) Information
• ADU Cost Estimation Tools
• ADU Guidebooks
• Permit Process Information
• Zoning & Property Requirement Resources
• Site Planning Guidance
• Design Resources
• Pre-Approved ADU Plan Information
• Financing Resource Information
• Homeowner ADU Support Tools
• Housing Development Resources
• Property Assessment Guidance
• Local ADU Regulation Information

Why Choose Humboldt ADU?

• Official Humboldt County ADU resource
• Comprehensive homeowner education platform
• Free access to ADU planning information
• Step-by-step guidance for the ADU process
• Local zoning and permitting resources
• Helpful cost and feasibility tools
• Access to ADU guidebooks and planning materials
• Supports code-compliant housing development
• Simplifies complex ADU regulations
• Designed specifically for Humboldt County property owners