Who Supplies What for a Title 24 Report: Designer, Window Supplier, HVAC Contractor and Installers
The designer holds the address, orientation and dimensions. The window supplier holds the NFRC ratings. The HVAC contractor holds equipment type, efficiency and duct details. The plumber holds the water heater and piping, and the insulation and solar installers hold R-values and the array. Asking each the right question saves days.
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Five questions to forward
- Designer or owner: what is the area of every window, wall, door, roof, ceiling and floor? The model needs each area with its U-factor, SHGC, solar reflectance and thermal mass, plus fixed shading such as overhangs and side fins. The full street address fixes the climate zone (Section 10-109(c)1C).
- Window supplier: what are the NFRC U-factor and SHGC? Section 110.6(a) requires ratings under NFRC 100 and NFRC 200, or the default tables 110.6-A and 110.6-B. The labels on the products are the proof.
- HVAC contractor: which equipment, and where do the ducts run? The model needs type and rated efficiency and, for forced-air systems, duct location and insulation. Efficiency is checked against the Energy Commission appliance database, a federal directory or an approved trade association directory (Section 110.1(b)).
- Plumber: which water heater, and how is hot water piped? The model needs type, number, efficiency, area served and the distribution system.
- Insulation and solar installers: what R-value and what array? Solar needs size, roof slope and orientation, with battery capacity if one is proposed.
Where each answer returns
Whoever supplies a number later certifies it. Every installing contractor signs a certificate of installation (CF2R) for the feature they install, and the compliance manual sorts them into envelope, lighting, mechanical, plumbing and solar families. The plans examiner compares the CF1R with the plans, so a value given by phone but absent from a schedule is a likely correction. An ECC-Rater then checks the installed system against the registered CF1R (different equipment than the CF1R).
If a trade is not chosen yet
Let the model carry the system type and minimum efficiency as a stated assumption, and confirm it before plan check. HVAC not yet selected shows how. The plans must later match the report, as Title 24 on the plan set explains.
Where to go next
The Title 24 checklist lists the items by project type, and 12 things to settle before ordering covers decisions. For a report built from these answers see residential Title 24 reports.
More Title 24 Guides
- What Every California Homeowner Should Know About Title 24
- 12 Things to Know Before Ordering a Title 24 Report
- Title 24 Checklist: What to Have Ready Before You Order
- How to Read Your CF1R, Page by Page
- 15 Title 24 Mistakes That Trigger Plan Check Corrections
- How to Choose a Title 24 Consultant
Frequently Asked Questions
The installer signs the certificate for what is installed, and the ECC-Rater or inspector compares it with the CF1R. Check labels before you order the product, not at final.
Yes. Group the replies by trade and include the full street address and the current drawings.
Explore Permit-Ready Reports
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- What Plans Are Needed for a Residential Title 24 Report?
- Whole-House Remodel Title 24 Checklist
- Can a Building Department Waive the Title 24 Report? When "You Don't Need One" Is Allowed
- Can I Submit a Title 24 Report Electronically? Signatures, PDFs and Registered Copies
View all Permit-Ready Reports guides → · Reports and Calculations · Title 24 guide