Adding an ADU or major addition to your California home means meeting current Title 24 energy standards. Here's what those requirements entail.
Title 24 for ADUs
New ADUs must meet full Title 24 compliance as new construction. Detached ADUs: cool roof, proper insulation, efficient HVAC, solar-ready roof. Attached ADUs: same standards plus connection to main home HVAC. Compliance costs typically add $5,000-15,000 for a 500 sq ft ADU.
Title 24 for Major Additions
Room additions over 5% of existing conditioned floor area: new envelope must comply. Insulation minimum R-values. Cool roof reflectance requirements. Connection to main home systems requires efficiency standards.
Ready to Start Your Project?
Schedule a free consultation with our design team.
HVAC and Mechanical System Requirements
Both ADUs and additions must have efficient heating/cooling. Heat pumps are now preferred over gas furnaces. Ductwork must meet sealing requirements. Smart thermostats with ability to control each zone. Ventilation requirements must be met.
Solar Requirements and Credits
New buildings (including ADUs) must be 'solar-ready': roof design allowing solar panel installation. Solar-ready plans must be submitted. Pre-installation of solar panels can earn efficiency credits.
Final Thoughts
Title 24 compliance for ADUs and additions is mandatory but creates more efficient, comfortable spaces that save money long-term.
Frequently Asked Questions
Costs vary based on scope and location. Consult with professionals for accurate estimates.
