California homeowners and designers adding an ADU
Free check for a California ADU or addition: your climate zone, the 2025 Energy Code rules that apply, and who runs and registers the energy report.
ePlan fills in
How it works
What you get
The check is free. The paperwork after it is drafted at the REScheck compliance report and Manual J load calculation door.
Modeled on: California Energy Commission 2025 Single-Family Residential Compliance Manual
From public data
is when the 2025 California Energy Code took effect for new permit applications
Source: California Energy Commission
Draft the REScheck energy report and Manual J load calculation your permit office asks for, from your plans and address. Free to read, pay to download.
Questions
Buildings whose permit applications are filed on or after January 1, 2026 must comply with the 2025 Energy Code.
The 2025 Energy Code created the Energy Code Compliance (ECC) Program, which replaces the HERS program's field verification and diagnostic testing for code compliance. As of January 1, 2026, HERS providers and raters are recognized as ECC-Providers and ECC-Raters.
CEC-approved compliance software, including CBECC, the public domain software the Energy Commission develops. New permit applications made on or after December 18, 2026 must use CBECC 2025.3.0 or newer.
Related doors
Where is the house being permitted?
Where is the work in the street?
Which site are you inspecting today?
What's the property address?
Where is the project?
Where is the construction site?
Answer it and ePlan opens the REScheck compliance report and Manual J load calculation door with your answer filled in.