Title 24 guides
Guides explain the rules in plain English and cite the California Energy Commission's 2025 compliance materials.
The complete Title 24 guide
Title 24 Part 6 from start to finish: who needs a report, compliance paths, forms, ECC testing, 2025 changes, plan check and a glossary.
What is a Title 24 report?
What a CF1R is, who needs one, what is in it, and when it must be registered.
CF1R, CF2R and CF3R explained
Who signs each form and when, the HERS-to-ECC rename, and CHEERS fees.
Title 24 for ADUs
Detached ADU vs attached ADU vs garage conversion vs JADU under the 2025 Energy Code, including the solar PV rule.
ECC (HERS) rater testing for an ADU
What gets tested on a ductless mini-split ADU, how many visits, and how to need fewer.
How much does a Title 24 report cost?
Published market prices, what raises the price, and rater and CHEERS fees.
California climate zones
The 16 building climate zones, how to find yours, and what changes by zone.
When is Title 24 required?
New construction, additions, alterations and repairs, with the 2025 rules for windows, HVAC, water heaters and reroofs.
Title 24 window replacement
U-factor and SHGC limits by climate zone, the 75 sq ft exception, labels and forms.
Title 24 plan-check corrections
Common energy corrections from California plan checkers, and how to fix or avoid each one.
Title 24 document checklist
What to send for a report, by project type.
Does my ADU need solar?
Which ADUs need solar PV under the 2025 code, how the size is set, and the exceptions, including the 1.8 kWdc minimum.
Heat pump water heater rules
Prescriptive HPWH options, NEEA Tier 3, room size and venting, and electric-ready rules when you choose gas.
Mini-split Title 24 requirements
Load calculations and Manual S sizing, refrigerant charge by weigh-in, verified ratings and what the rater checks.
Kitchen hood and bath fan rules
Range hood airflow or capture efficiency by home size and fuel, bath fan airflow, sone limits and whole-house ventilation.
QII insulation inspection
What Quality Insulation Installation checks, when it is required, the 700 sq ft addition exception and how to pass.
Owner-builder Title 24
Signing CF2R forms, CHEERS homeowner access, booking the ECC rater and getting to final as an owner-builder.
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