This page is a collection of resources to help you understand the rules and codes that apply when building an ADU in California, technical guidance on how to build greener, energy-efficient, high-performing ADUs, and resources to make ADUs more accessible to you, your family and neighborhood.
Sections include:
ADU Building Rules, Codes & Guidance
State and local guidance on energy and building codes that apply to ADUsFor a written summary of the presentation, go here.
2019 Title 24, Part 6 (Energy Code) for ADUs
California Energy Commission (CEC) Energy Specialists Amie Brusseau walks us through a presentation of what components of the 2019 energy code apply to ADUs, from new construction to alterations and additions.CEC Hotline
For specific technical question, reach out to:This email address is being protected from spambots. You need JavaScript enabled to view it.
(800) 772-3300
Resources mentioned in the presentation
Energy Code Ace Guide
Two page quick reference on ADU building specifications for Title 24, Part 6 energy code.Housing and Community Development (HCD) ADU Handbook Guide
Relevant rules from the California HCD for ADUs and JADUs including all zoning districts that allow single-family and multifamily uses, limited exemptions or reductions in impact fees, and reduced parking requirements.California Energy Center (CEC) Online Resource Center Website
Website that provides Building Energy Efficiency Standards (Energy Code) educational assistance. Resources include fact sheets, energy videos and presentations organized by topic (e.g. water heating, solar, lighting, building envelope and HVAC).Other Helpful Resources
Guide to Garage Conversions
Simplifies the process and rules that apply to one of the more cost effective types of ADUs.Symbium Build
Learn instantly if you can have an ADU on your propertyFacebook Group: How to ADU
A community of ADU homeowners and builders navigating the process of building an ADU in California.Green Building Techniques for ADUs
Above and beyond: reach codes for healthy, sustainable homes.
A research report with findings that a reduced home size and/or addition of an ADU is an effective strategy for reducing both energy consumption and material waste, and provides flexibility and adaptability for different family configurations over time.
Pocket Guide to All Electric Retrofits of Single Family Homes, by Redwood Energy
A practical homeowner and developer guide with efficient electric alternatives to replace existing gas appliances. Helpful inspiration also for all-electric, new construction ADUs. Sections include a cost benefit analysis, case studies on lessons learned from retrofitted homes, and an extensive product guide.
Professional Services for ADUs
Directories to help identify companies and professionals who offer ADU servicesADU Builders, Architects, and Designers in California and nationally - Volunteer-managed list aggregating self identified companies that offer ADU services.
ADU Specialists - Accredited professionals that have completed training to help homeowners with site eligibility, development process and cost, and return on investment for ADUs.
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