CF1R for Home Additions: Which Form Do I Need?
Three questions pick the form. Is the addition 1,000 sq ft or more? Then CF1R-NCB-01-E on the prescriptive route. Under 1,000, it is CF1R-ADD-01-E, or CF1R-ADD-02-E when nothing needs field verification. Modeling the addition for trade-offs, or together with the existing house, produces CF1R-PRF-01-E instead.
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Start with the square footage you are adding
Appendix A of the 2025 compliance manual names the forms. CF1R-ADD-01-E is "Prescriptive Additions Less Than 1,000 ft2". CF1R-NCB-01-E is "Prescriptive Newly Constructed Buildings and Additions Equal to or Greater Than 1,000 ft2". Separate additions under one permit are added together to set the tier.
ADD-01-E or ADD-02-E: does anything need a rater?
CF1R-ADD-02-E is "Prescriptive Additions - That Do Not Require Field Verification". It stops fitting the moment a feature needs an ECC-Rater (called a HERS rater before 1 January 2026, when the ECC Program replaced the HERS Program). Two common triggers:
- Extending any length of duct from the existing system sends the extension through the duct-sealing rules, confirmed by field verification (Exception 4 to Section 150.2(a)).
- An addition over 700 sq ft carries quality insulation installation, which a third-party ECC-Rater verifies.
Once verification applies, the certificate is completed and registered online with an ECC-Provider before it goes to the building department. See when registration applies.
When the performance form replaces all three
Approved software produces CF1R-PRF-01-E when you model the addition alone, or the existing house with the addition and any alterations. People switch to it when a prescriptive glazing cap bites: the caps are the greater of 75 sq ft or 30 percent of the addition through 400 sq ft, 120 sq ft or 25 percent above that up to 700, and 175 sq ft or 20 percent above 700. The comparison of the two routes and the difference between the two reports cover what changes.
Small additions, and an addition plus other work
For an addition under 300 sq ft with no field verification, Section 10-103(a)1C lets a department require no certificate or a simplified one. It adds that this does not authorize work that breaks the code, so ask the counter first. If the permit also alters the existing house prescriptively, the manual pairs ADD-01-E with an alteration form, though its chapters differ on ALT-01-E versus ALT-02-E (see the HVAC page).
Size-by-size rules are on the room addition and threshold pages; our residential service prepares the form.
Common Title 24 Questions
- What is a CF1R certificate of compliance?
- What is a CF2R certificate of installation?
- What is a CF3R certificate of verification?
- What is an NRCC form?
- What is an NRCA certificate of acceptance?
- What is an LMCC form?
Frequently Asked Questions
Only if nothing on the job needs field verification. A duct extension to the addition, for example, does, and then ADD-01-E fits. A department may also skip or simplify the certificate for additions under 300 sq ft without verification.
No. Registration follows field verification. The manual says registration is required for most additions, but a job with no verified feature does not need it.
Explore CF1R: Certificate of Compliance
- CF1R for HVAC Replacement: Which Form Do I Need?
- CF1R for Roof and Insulation Alterations
- CF1R for Water Heater Replacement: Which Form Do I Need?
- CF1R for Window Replacement: Which Form Do I Need?
- CF1R-NCB-01-E: The Prescriptive Certificate for New Homes and Large Additions
View all CF1R: Certificate of Compliance guides → · Forms and Certificates · Title 24 guide