Form CEC-CF1R-ALT-05-E at a glance
What it is: CEC-CF1R-ALT-05-E is the Certificate of Compliance for prescriptive residential alterations that do not require ECC field verification.
Who signs: The person who prepared the CF1R will sign and complete the fields for their name, company (if applicable), address, phone number, certification information (if applicable), date and signature. The person who is assuming responsibility for the project being built to comply with Title 24, Part 6, will complete the fields for their name, company (if applicable), address, phone number, license number (if applicable), date and signature.
This compliance document is only applicable to simple alterations that do not require field verification for compliance. When field verification is required, a CF1R-ALT-01 shall first be registered with an ECC-Provider Data Registry.
What to bring and attach to Form CEC-CF1R-ALT-05-E
Completing these forms will require that you have the Reference Appendices for the 2025 Building Energy Efficiency Standards.
A filled-in Form CEC-CF1R-ALT-05-E example: general information for an attic insulation project

How to fill out Form CEC-CF1R-ALT-05-E, box by box
Project, enforcement agency and permit
A. General Information

Enter the Project Name as identifying information, such as owner's name.
Enter the Date Prepared, the date of document preparation.
Enter the Project Location, the legal street address of property or other applicable identifying information.
Enter the Building Front Orientation expressed in degrees, where North = 0, East = 90, South = 180, and West = 270. Indicate cardinal if it is a subdivision project built in multiple orientations.
Enter the CA City, the legal city/town of property.
Enter 1 for Number of Altered Dwelling Units for single-family.
Enter the Zip Code as the 5-digit zip code for the project location (used to determine climate zone).
Fuel Type is limited to the one of the following: Natural Gas, Propane, or Electricity.
Enter the Climate Zone from Reference Appendices, Joint Appendix, JA2.1.1.
Enter the new conditioned floor area in square feet (ft2) as the Total Conditioned Floor Area, as measured from the outside of exterior walls of the dwelling unit or building being altered.
Enter the Slab Area, the area of the first floor slab (if any) in square feet (ft2).
More rules for Form CEC-CF1R-ALT-05-E
Alterations that utilize closed cell Spray Polyurethane Foam (ccSPF) with a density of 1.5 to less than 2.5 pounds per cubic foot having an R-value greater than 5.8 per inch, or open cell Spray Polyurethane Foam (ocSPF) with a density of 0.4 to less than 1.5 pounds per cubic foot having an R-value of 3.6 per inch, shall complete and register a CF1R-ALT-01 with a ECC-Provider Data Registry.
If your situation is different
B. Opaque Surface Details - Framed
Enter the Tag/ID, a label (if any) from the plans, such as A1.4 or wall.
Enter the Assembly Type: Roof, Ceiling, Wall, Floor or Attic.
Enter the Frame Type: Wood or Metal.
Enter the Frame Depth as nominal dimensions of framing material in inches such as 2x4, 2x6, 2x8, 2x10.
Enter the Frame Spacing: 16, 24 or 48 inches on center.
Enter the Proposed Cavity R-value, the insulation installed between framing.
Enter the Proposed Continuous Insulation R-value, the R-value of rigid or continuous insulation (not interrupted by framing).
Section 110.8(d) specifies that if adding insulation to an existing attic, the resulting attic insulation must total R-22. However, the amount of insulation required is limited to the amount of room available for insulation without conflicting with Building Code Section 1203.2.
Enter the Proposed U-factor, the U-factor for the entire assembly.
Enter the Required U-factor from the requirements in Sections 110.8 and 150.0.
Enter Comments as any notes regarding location, unique conditions, or attachments.
J. Space Conditioning (SC) Systems - Heating/Cooling
In each row for each space conditioning system, select the applicable exemption from the dropdown list in the Field Verification Compliance.
Exemption from field Verification (Section 150.2(b)1E): Space Conditioning (SC) System was not altered; or duct systems with less than 25 linear feet in unconditioned spaces as determined by visual inspection.
Existing duct systems constructed, insulated or sealed with asbestos; or duct systems that have been documented to have been previously sealed as confirmed through field verification and diagnostic testing in accordance with procedures in the Reference Appendices, Residential Appendix, RA3.1.
If new space conditioning systems are installed or existing systems are altered and are not exempt from field verification and diagnostic testing, then a CF1R-ALT-02 shall be completed and registered with an ECC Provider Data Registry.
K. Water Heating Systems
List water heaters and boilers for both domestic hot water (DHW) heaters and hydronic space heating.
Enter the Tank Volume as the tank capacity in gallons. For instantaneous water heaters, enter N/A.
Common questions about Form CEC-CF1R-ALT-05-E
What is CF 1R form?
CEC-CF1R-ALT-05-E is the Certificate of Compliance for prescriptive residential alterations that do not require ECC field verification. Minimum requirements for prescriptive alteration compliance can be found in Building Energy Efficiency Standards Section 150.2(b)1.
Who signs it?
If more than one person has responsibility for installation of the items on this certificate, each person shall prepare and sign a certificate applicable to the portion of construction for which they are responsible. Alternatively, the person with chief responsibility for construction shall prepare and sign this certificate for the entire construction. All applicable Mandatory Measures shall be met. Temporary labels shall not be removed before verification by the building inspector.
Is there a penalty?
The Responsible Person certifies under penalty of perjury, under the laws of the State of California: The information provided on this Certificate of Compliance is true and correct.
What am I certifying when I sign?
By signing you certify that this Certificate of Compliance documentation is accurate and complete.
When is this form not the right one?
If any part of the alteration does not comply, prescriptive compliance fails, in which case the performance compliance approach must be used in an attempt to achieve compliance.
Where to get help with Form CEC-CF1R-ALT-05-E
For assistance or questions regarding the Energy Standards, contact the Energy Hotline at: 1-800-772-3300.
Sources
[1] Form CEC-CF1R-ALT-05-E (May 1, 2026 revised), Certificate of Compliance, Prescriptive Residential Alterations That Do Not Require ECC Field Verification, California Energy Commission (the Official source link on this page).


