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.
State and local guidance on energy and building codes that apply to ADUs
For 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.
For specific technical question, reach out to:
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.
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).
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.
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 services