General Resources
ADU Workbook & Exercises
A complete guide to planning an accessory dwelling unit for Napa & Sonoma Counties. Download this workbook to guide you A to Z through the ADU process — plus, it has useful activities to help you plan your project effectively.
ADU Glossary
Feeling confused by all the jargon? This resource helps explain some of the common terminology you’ll hear when working on your ADU project.
Getting Started
ADU Process Map
An overview of the ADU process, from start to finish. (Ask your local planning department if they have a more specific version!)
Feasibility Consults
Meet with our ADU expert for a customized ADU Feasibility Consult & Report to ensure you have a clear understanding of what you can build, cost drivers, key tips, the types of professionals you'll need, and your next steps for success.
Learning the Rules
Address Lookup Tool
If you want to build an ADU or Junior ADU on your property, use our lookup tool to see what you're eligible to build. This is a quick reference to find out if there are eligibility issues to consider at the very front end of your ADU planning process.
Local ADU Rules
Learn about the ADU rules in your jurisdiction. Check out this resource for a brief overview of the ADU and Junior ADU policies in your city or unincorporated county.
Budget & Finance
ADU Calculator
Estimate the cost of converting part of your home or constructing a new ADU. You can even use this tool to think through the return on investment (ROI) of building an ADU.
ADU Budget Tracker
Track your spending and budget throughout the entire project with our easy-to-use tool.
Design
Standard ADU Plans Program
Browse our gallery of 50+ ADU plans, all easily available for purchase and permitting – saving you time and money in the process.
Vendor directory
Browse our list of vendors to team with you throughout your ADU project, including finance, design, site preparation, and construction.
Permitting
Permit Checklist
Download this editable ADU Permit Checklist to help you think through building requirements and agency fees. You can type into this worksheet to help you keep track of your local ADU permit application requirements
Construction
Vendor directory
Browse our list of vendors to team with you throughout your ADU project, including finance, design, site preparation, and construction.