Verification of Existing Conditions (CF3R-EXC-20-H): What It Is and When It Pays Off
CF3R-EXC-20-H is the ECC-Rater's record of what a house already contains before a performance-method remodel. It is optional. With it, upgrades are credited against the verified old components; without it, against fixed assumptions in the code. The visit has to happen before work starts and before the CF1R can be registered.
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Two ways to model what is already there
For an altered component, Table 150.2-G sets the standard design. Without third-party verification it is the code's own requirement, for example the fenestration values of Section 150.1(c)3A. With verification it is the existing U-factor and SHGC as verified. Verifying makes sense only if the old component is worse than the code floor, because that gap becomes credit.
The window example
The compliance manual replaces a single-pane metal operable window with a 0.35 U-factor window. Unverified, the credit is measured against the standard design assumption. Verified, it is measured against the 1.28 default for that kind of window. Same window, larger credit, one extra visit.
What the rater does
The registry generates the CF3R-EXC-20-H from the performance software output, listing the existing features the rater must field-verify. A registered CF3R-EXC-20-H that agrees with the existing-conditions input is a prerequisite for registering the CF1R. The compliance manual's table prints the number as C3R-EXC-20-H, a typo, and titles it Verification of Existing Conditions for Residential Alterations.
The timing trap
The inspection must be completed before construction begins and before registration, which in practice means before the permit application. After demolition the old window or insulation is gone and cannot be verified. Order the rater early; the guide to preparing for the ECC-Rater shows the sequence.
It only reaches altered parts
Verification applies to components being altered. Existing walls around newly conditioned space, as in a garage conversion, count as new, so no verification can earn credit there (see alteration versus addition for an ADU).
When it is worth the visit
Consider it when the performance margin is tight and the old components are poor, such as single-pane windows. For unknown insulation without a rater see an older home with unknown insulation and how the existing, addition and alteration method works. Our residential service can model both ways.
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
No. It is an option in the performance method. Without it, the software uses fixed assumptions for the altered components.
No. The inspection must come before construction begins, since the existing condition must still be visible to the rater.
Explore CF3R: Certificate of Verification
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- What Is a CF3R Certificate of Verification?
View all CF3R: Certificate of Verification guides → · Forms and Certificates · Title 24 guide