9.4 Permits, Inspections & Code Compliance Documentation

When Is an HVAC Permit Required?

The default rule a C-20 candidate should apply, both on the exam and on the job, is: installing, altering, or replacing HVAC equipment generally requires a building permit -- including a straightforward like-for-like changeout of a furnace, air conditioner, or heat pump in the same location. This is true even when the replacement equipment is functionally identical to what was removed, because the work touches combustion safety, gas piping, electrical connections, refrigerant handling, and Title 24 energy compliance -- all life-safety and regulatory concerns the building department has an interest in verifying, not just an efficiency formality.

A narrow set of minor repairs that do not involve structural changes, new gas piping, new electrical circuits, or duct modifications may be treated as exempt in some jurisdictions (for example, replacing a failed capacitor or contactor). But because permit exemption lists vary by local jurisdiction and are narrower than most contractors assume, the safer and generally correct default is to pull a permit whenever equipment or ductwork is being installed, replaced, or substantially altered. Performing permit-required work without a permit exposes the contractor to code enforcement citations and potential CSLB discipline, and can create real problems for the property owner later -- unpermitted HVAC work is a common finding during a home sale inspection or an insurance claim investigation, and it can leave a homeowner without the paper trail needed to prove the system was installed to code.

The Permit and Inspection Sequence

A typical C-20 permit moves through four stages:

1. Application and plan check. The contractor submits the permit application along with equipment specifications and cut sheets, load calculations (Manual J, tying back to Chapter 8's coverage of load calculations), and, for scope of work covered by Title 24, the CF1R Certificate of Compliance prepared before installation begins. The building department reviews the submission for completeness against both the CMC and the Energy Code.
2. Rough-in inspection. Conducted before walls, ceilings, or other finishes are closed up, this inspection verifies duct routing and support spacing, refrigerant line set installation, equipment pad or platform placement and seismic strapping or anchoring, combustion air provisions, gas line routing, and (commonly) a gas line pressure test, along with clearances to combustibles.
3. Start-up, commissioning, and field verification. Once installation is complete, the contractor fills out the CF2R Certificate of Installation, documenting what was actually installed. Where field verification applies (see Section 9.2), an independent HERS/ECC rater performs the required diagnostic testing -- duct leakage, refrigerant charge, and airflow -- and files the CF3R Certificate of Field Verification and Diagnostic Testing.
4. Final inspection. The building inspector confirms combustion air, venting, gas supply, electrical connections, condensate disposal, and clearances in the field, and verifies that the required CF2R and CF3R documentation has been submitted or registered. The permit is only "finaled" once all applicable CF forms are on file with the local jurisdiction -- and, for the CF3R specifically, registered with an approved HERS/ECC Provider registry.

The CF Compliance Documents

Three numbered compliance certificates carry an HVAC project's Title 24 paper trail from design through field verification:

• CF1R -- Certificate of Compliance. Prepared before or at the time of permit application by the person responsible for the design (commonly the HVAC contractor for equipment-only scope, or a dedicated energy consultant on larger or more complex projects). The CF1R documents the proposed measures -- equipment efficiency, duct design, controls -- that demonstrate the project meets Title 24 Part 6, whether through the prescriptive or performance compliance path described in Section 9.1.
• CF2R -- Certificate of Installation. Completed by the installing contractor after the work is physically done. It confirms that what was actually installed matches what the CF1R proposed, or documents any field changes that occurred during installation.
• CF3R -- Certificate of Field Verification and Diagnostic Testing. Completed by the independent HERS/ECC rater after conducting the required diagnostic tests, and registered into the state-recognized registry maintained by an approved HERS/ECC Provider organization. The CF3R is the record the building department actually relies on to confirm that field verification took place -- not merely that the contractor stated it would.

Projects involving existing-building alterations rather than new construction commonly use "ALT" variants of these forms (for example, CF1R-ALT), since the applicable list of mandatory measures for an alteration differs from what applies to new construction. A C-20 candidate should come away from this section knowing the three-document sequence cold -- design (CF1R) before installation, installation (CF2R) by the contractor, and independent field verification (CF3R) by the rater -- because a building department will not final a permit with any of the three missing when field verification applies to the scope of work.