California Attorney Fee Petition Mechanics — Bus. & Prof. Code § 7028 (C-43 Sheet Metal Contractor Specialty — California Contractors State License Board)

California CSLB Sheet Metal Contractor C-43 Attorney Fee Petition Mechanics: Tyler Odyssey Civil Complaint Date as Primary Welch Anchor, CSLB License Check (C-43 Specialty) as Secondary Anchor (THE ONLY C-43 Sheet Metal Contractor Specialty Page in This Series — ONLY Page With California Energy Code Title 24 Part 6 Residential Duct Leakage HERS Testing Advisory [Mandatory CEC HERS Rater Field Verification; Distinct From C-20 HVAC ACCA Manual D/J Advisory]; ONLY Page With California Building Code § 717 Fire Damper Fire-Rated Assembly Breach Advisory; ONLY Page With SMACNA HVAC Duct Construction Standards Metal and Flexible Advisory [Private Standard — PURE KETCHUM]; ONLY Page With Duct Leakage Energy Loss / Fire Damper Omission Fire Spread / Duct Contamination Three-Track Harm; Bus. & Prof. Code § 7031(b) Disgorgement), CLRA § 1780 Mandatory Attorney Fees

California Business and Professions Code § 7028 — the unlicensed contractor prohibition — applies to every person who engages in the business of a contractor in California without holding a valid CSLB license. For sheet metal fabrication and installation in HVAC systems, the relevant specialty classification is C-43 (Sheet Metal Contractor), which authorizes the fabrication, installation, and repair of metal ductwork systems including supply and return air ducts, sheet metal flashing, gutters and downspouts, kitchen exhaust hoods, and custom sheet metal fabrication. C-43 sheet metal duct installation intersects three distinct California regulatory and technical frameworks: (1) California Energy Code Title 24 Part 6 mandatory HERS duct leakage field verification before building permit final inspection — THE ONLY page in the fee-petition-mechanics series where duct leakage HERS testing is the primary energy code advisory (distinct from the C-20 HVAC page's ACCA Manual D/J equipment sizing advisory); (2) California Building Code Section 717 fire damper requirements for HVAC ductwork penetrating fire-rated wall and floor/ceiling assemblies; (3) SMACNA HVAC Duct Construction Standards Metal and Flexible (Sheet Metal and Air Conditioning Contractors' National Association) — the private industry standard defining acceptable joint construction, seam sealing, and duct support requirements. THREE UNIQUE DISTINCTIONS in this page: (1) THE ONLY page with CALIFORNIA ENERGY CODE TITLE 24 PART 6 RESIDENTIAL DUCT LEAKAGE HERS TESTING ADVISORY — mandatory CEC HERS Rater field verification of duct leakage before permit final; the HERS duct leakage test is the only CEC compliance verification in the fee-petition-mechanics series that is a MANDATORY FIELD TEST performed by a THIRD-PARTY CEC-CERTIFIED RATER — distinct from the C-2 Insulation R-value advisory (no HERS test required) and the C-17 Glazing fenestration advisory (HERS rater only sometimes required); (2) THE ONLY page with CALIFORNIA BUILDING CODE § 717 FIRE DAMPER ADVISORY — fire dampers must be installed wherever HVAC ducts penetrate fire-rated assemblies; an unlicensed C-43 contractor who installs ductwork through fire-rated walls without UL-listed fire dampers creates a fire-rated assembly breach and building code defect; (3) THE ONLY page with DUCT LEAKAGE ENERGY LOSS / FIRE DAMPER OMISSION FIRE SPREAD / DUCT CONTAMINATION three-track harm — duct leakage causes measurable heating/cooling energy loss with quantifiable annual utility cost damages; missing fire dampers create fire spread risk through rated assemblies; improperly sealed ductwork draws unconditioned attic air (containing insulation particles, mold spores, and pest debris) into living spaces creating IAQ harm. PURE KETCHUM: SMACNA HVAC Duct Construction Standards is a private industry standard published by a trade association — no mandatory civil attorney fees; federal OSHA ductwork standards are worker safety only. Total billing gap: 13.25 hrs = $3,975–$6,625/yr.

TL;DR

Bus. & Prof. Code § 7028 requires CSLB C-43 specialty licensure for sheet metal duct fabrication and installation; unlicensed sheet metal contracting activates the CEC Title 24 Part 6 duct leakage HERS testing advisory (mandatory third-party HERS Rater field verification — THE ONLY mandatory HERS field test advisory in the series; distinct from C-20 ACCA Manual D/J), the CBC § 717 fire damper advisory (fire-rated assembly breach from missing dampers in duct penetrations), and the duct leakage energy loss / fire damper omission fire spread / duct contamination three-track harm. Primary Welch anchor: Tyler Odyssey civil complaint date. Secondary anchor: CSLB License Check (C-43 specialty). ONLY page with CEC duct leakage HERS testing and CBC fire damper advisories. Bus. & Prof. Code § 7031(b) disgorgement. PURE KETCHUM — SMACNA standards are private industry standards. 13.25 hrs = $3,975–$6,625/yr.

Statutory Framework: Bus. & Prof. Code § 7028, C-43 Sheet Metal Specialty, CEC Title 24 Part 6 Duct Leakage HERS Testing, CBC § 717 Fire Dampers, SMACNA Duct Standards, § 7031(b) Disgorgement, and CLRA § 1780 Mandatory Attorney Fees

California Business and Professions Code § 7028 prohibits unlicensed contracting. The CSLB C-43 Sheet Metal Contractor classification authorizes the fabrication, installation, and repair of sheet metal ductwork and related sheet metal systems. Any person who performs C-43 sheet metal duct installation as a standalone trade for a contract price exceeding $500 in California without a valid C-43 license (or a C-20 HVAC license where sheet metal duct installation is directly incidental to a complete HVAC system installation by the same contractor) violates § 7028.

California Energy Code Title 24 Part 6 requires HERS (Home Energy Rating System) duct leakage field verification for new duct installations and qualifying duct replacement projects. A California Energy Commission-certified HERS Rater conducts the duct leakage test — typically a duct pressurization test that measures total duct leakage to outside the conditioned space as a percentage of nominal system airflow capacity. For new construction, CEC typically requires ≤6% total duct leakage; for alterations, the ≤15% total leakage pathway provides flexibility. The HERS Rater issues a CF3R compliance form documenting the test results; building permit final inspection cannot be approved without the CF3R confirming HERS duct leakage compliance.

California Building Code Section 717 (Title 24 Part 2) requires fire dampers wherever HVAC ductwork penetrates fire-rated assemblies: fire barriers (2-hour rated walls), fire partitions (1-hour rated corridor and tenant separation walls), horizontal assemblies (rated floor/ceiling assemblies in fire-resistive construction), and smoke barriers. Fire dampers are UL-listed devices (UL Standard 555) that contain a fusible link or motor actuator that closes the damper automatically when fire or heat is detected in the duct, preventing fire and combustion products from passing through the fire-rated assembly via the duct opening. SMACNA HVAC Duct Construction Standards Metal and Flexible (most recent edition: SMACNA 2006) specifies duct joint construction, seam sealing methods, pressure class requirements, and duct support spacing — the industry-standard reference for sheet metal duct fabrication quality, PURE KETCHUM as a private trade association standard.

Three Unique Distinctions in the Fee-Petition-Mechanics Series

  • THE ONLY page with CALIFORNIA ENERGY CODE TITLE 24 PART 6 RESIDENTIAL DUCT LEAKAGE HERS TESTING ADVISORY — mandatory CEC-certified HERS Rater third-party field verification of duct leakage before building permit final; THE ONLY mandatory HERS field test advisory in the fee-petition-mechanics series; distinct from C-20 HVAC's ACCA Manual D/J equipment sizing advisory: the CEC duct leakage HERS testing advisory generates pre-complaint hours unique to C-43 sheet metal duct installation matters: (a) confirming whether a building permit was obtained for the duct installation and whether a HERS Rater field verification (CF3R form) was filed with the building department before permit final — if no HERS CF3R form is on file, the permit was closed without required HERS verification, confirming a CEC compliance deficiency; (b) engaging a CEC-certified HERS Rater to conduct a post-installation duct leakage test to determine whether the installed ductwork meets the CEC maximum allowable leakage threshold — if duct leakage exceeds the maximum (typically 6% for new construction), the HERS Rater confirms the deficiency and quantifies the remediation obligation (duct sealing at all leakage points, re-test to confirm compliance); (c) quantifying the duct leakage remediation cost as CLRA actual damages: sealing gaps at duct joints (mastic sealant or UL 181-listed duct tape on all longitudinal seams and transverse joints), sealing flex duct connections, and re-testing by a certified HERS Rater; residential duct sealing remediation may range from $500 to $5,000+; (d) advising on the energy overconsumption damages from leaky ductwork — ducts leaking 15–30% of airflow into unconditioned attic space cause measurable HVAC energy overconsumption; an energy audit quantifying the annual heating/cooling cost premium from the defective duct installation can generate ongoing damages beyond the one-time remediation cost; (e) advising on TDS disclosure obligation — unverified ductwork without HERS CF3R documentation is a known energy code compliance gap requiring disclosure in future property sale under Civil Code § 1102.6; the CEC duct leakage HERS testing advisory is the ONLY mandatory HERS field test advisory in the entire fee-petition-mechanics series — THE ONLY advisory where CEC compliance requires a THIRD-PARTY CERTIFIED RATER to conduct a field test and file compliance documentation before building permit final.
  • THE ONLY page with CALIFORNIA BUILDING CODE § 717 FIRE DAMPER ADVISORY — fire dampers must be installed wherever HVAC ducts penetrate fire-rated assemblies; an unlicensed C-43 Sheet Metal contractor who installs ductwork through fire-rated walls or ceiling assemblies without UL-listed fire dampers creates a fire-rated assembly breach, building code defect, and life-safety risk: the CBC § 717 fire damper advisory generates pre-complaint hours unique to C-43 sheet metal matters: (a) identifying all locations where the installed ductwork penetrates fire-rated assemblies — in multi-family residential construction, fire-rated corridor walls (1-hour rated under IBC/CBC), unit separation walls (1-hour fire partitions), and floor/ceiling assemblies (2-hour horizontal assemblies in Type IA/IB construction) all require fire dampers at duct penetrations; (b) confirming whether UL-listed fire dampers were installed at each rated assembly penetration — a fire damper is visible as a device installed within the duct adjacent to the wall penetration, accessible via an inspection access panel; the absence of an inspection access panel at a rated assembly penetration is itself a building code defect (NFPA 90A requires annual fire damper inspection through an access door); (c) engaging a mechanical or fire protection engineer to confirm which duct penetrations required fire dampers under the applicable building code edition and construction type, and quantify the remediation cost (cutting inspection access panels, installing UL 555 fire dampers, restoring fire-rated assembly integrity); (d) advising on the life-safety implications — a structure with missing fire dampers at rated assembly penetrations cannot contain a compartment fire as designed; the fire-rated assembly without required fire dampers fails to achieve its rated performance, creating a life-safety building code defect requiring TDS disclosure; (e) the CBC § 717 fire damper advisory generates pre-complaint hours for fire-rated assembly duct penetration inventory, fire damper confirmation, mechanical engineer engagement, and remediation cost quantification unique to C-43 sheet metal matters and not found on any other CSLB specialty page in the fee-petition-mechanics series.
  • THE ONLY page with DUCT LEAKAGE ENERGY LOSS / FIRE DAMPER OMISSION FIRE SPREAD / DUCT CONTAMINATION three-track harm — three independent harm tracks from unlicensed C-43 sheet metal installation, each generating distinct CLRA actual damages and unique advisory hours: the three harm tracks are: Track 1 — DUCT LEAKAGE ENERGY LOSS: HVAC ductwork installed with unsealed joints, improperly connected flex duct sections, or missing seam sealant leaks conditioned air (heated or cooled) into unconditioned attic or crawl space; duct leakage of 15–30% of system airflow causes the HVAC equipment to run longer to maintain setpoint temperature, generating measurable annual energy overconsumption quantifiable through utility bill comparison before and after remediation or through an HVAC energy model; Track 1 CLRA actual damages include the duct remediation cost plus the annual energy overconsumption cost for the period of defective duct operation; Track 2 — FIRE DAMPER OMISSION FIRE SPREAD: HVAC ductwork penetrating fire-rated assemblies without required UL-listed fire dampers creates a breach in the fire-rated assembly; in a compartment fire, the missing fire damper allows fire and hot combustion gases to propagate through the ductwork into adjacent fire compartments, defeating the fire-rated assembly and potentially accelerating fire spread to neighboring units (in multi-family construction) or to adjacent rooms (in commercial construction); Track 2 CLRA actual damages include the fire damper remediation cost and, in extreme cases, diminution in property value from the code defect disclosure obligation; Track 3 — DUCT CONTAMINATION: sheet metal ductwork installed without proper joint sealing draws unconditioned attic or crawl space air through leakage points into living space supply and return air streams; attic air typically contains cellulose or fiberglass insulation particles, accumulated dust, mold spores from attic condensation, rodent feces from attic pest activity, and in older homes, potential fiberglass or mineral wool insulation fragments; ongoing duct contamination generates indoor air quality (IAQ) harm including exacerbation of respiratory conditions and allergy symptoms, requiring duct cleaning remediation ($300–$1,000+) and HVAC filter replacement.

PURE KETCHUM for Bus. & Prof. Code § 7028 C-43 Sheet Metal Contractor licensing violations: SMACNA HVAC Duct Construction Standards Metal and Flexible is a private standard published by the Sheet Metal and Air Conditioning Contractors' National Association — no mandatory civil attorney fees for SMACNA non-compliance; CBC Section 717 fire damper requirements are California administrative building code provisions creating building permit enforcement, not private mandatory fee statutes; California Energy Code Title 24 Part 6 duct leakage requirements are California administrative energy code provisions enforced through the HERS compliance program — no mandatory civil attorney fees; the CLRA § 1780 mandatory attorney fee entitlement against the unlicensed C-43 contractor is pure Ketchum; Ketchum v. Moses 24 Cal.4th 1122 (2001); PLCM Group Inc. v. Drexler 22 Cal.4th 1084 (2000); Hensley v. Eckerhart 461 U.S. 424 (1983); Missouri v. Jenkins 491 U.S. 274 (1989) fees-on-fees.

Primary Welch Anchor: Tyler Odyssey Civil Complaint Filing Date

The Tyler Odyssey civil complaint filing date is the primary Welch temporal anchor. In C-43 sheet metal matters, the attorney files after confirming the C-43 license status, engaging a CEC-certified HERS Rater to conduct a post-installation duct leakage test, confirming fire damper installation status at all fire-rated assembly penetrations, engaging a mechanical engineer to assess fire damper and duct contamination deficiencies, quantifying all CLRA damages, and serving the CLRA § 1782 demand. The CSLB C-43 License Check date is the secondary Welch anchor from which all pre-complaint advisory hours accrue.

Secondary Anchor: CSLB License Check (C-43 Sheet Metal Specialty) — THE ONLY C-43 Sheet Metal Specialty Anchor in the Fee-Petition-Mechanics Series

The CSLB License Check must confirm the C-43 Sheet Metal specialty. A C-20 HVAC license may cover incidental sheet metal ductwork installed as part of a complete HVAC system — but a standalone sheet metal duct installation contract requires C-43. Three status scenarios generate § 7028 liability: (a) no CSLB license of any kind; (b) C-20 license without C-43 for standalone duct fabrication/installation contracts; (c) expired, suspended, or revoked C-43 license. The C-43 License Check date is the secondary Welch anchor and this page is THE ONLY C-43 Sheet Metal Contractor specialty anchor in the entire fee-petition-mechanics series.

Billing Gap 1 — CSLB License Check (C-43 Specialty), CEC Duct Leakage HERS Test Advisory, CBC § 717 Fire Damper Confirmation, Duct Contamination Assessment, and § 1782 Demand (5.25 hrs/yr = $1,575–$2,625)

The first billing gap covers pre-complaint advisory: C-43 licensing confirmation, CEC duct leakage HERS test advisory, CBC § 717 fire damper confirmation, duct contamination IAQ assessment, and CLRA § 1782 demand.

  • Searching the CSLB License Check at cslb.ca.gov for the C-43 Sheet Metal specialty and establishing the secondary Welch anchor: confirming C-43 specialty presence or absence; advising on C-20-without-C-43 scenario for standalone duct installation contracts; confirming bond status for collection analysis.
  • Conducting the CEC Title 24 Part 6 duct leakage HERS testing advisory — confirming whether a building permit was obtained and whether a HERS CF3R duct leakage compliance form is on file with the building department; engaging a CEC-certified HERS Rater to perform a post-installation duct leakage test if no CF3R documentation exists: the HERS duct leakage advisory generates pre-complaint hours for permit history search, CF3R record confirmation, HERS Rater engagement, and duct leakage test results analysis.
  • Conducting the CBC § 717 fire damper advisory — identifying all duct penetrations through fire-rated assemblies and confirming fire damper installation or absence; engaging a mechanical engineer to assess fire-rated assembly breach severity: the fire damper advisory generates pre-complaint hours for fire-rated assembly inventory, fire damper confirmation, and remediation cost quantification.
  • Assessing duct contamination risk — confirming whether improperly sealed ductwork is drawing unconditioned air (containing insulation, mold spores, or pest debris) into the living space supply air stream: the IAQ assessment generates pre-complaint hours for duct contamination investigation and remediation advisory.
  • Quantifying § 7031(b) disgorgement and CLRA § 1780 actual damages (duct sealing and HERS re-test, fire damper installation, duct cleaning, energy overconsumption) and serving the CLRA § 1782 demand: residential duct installation contracts range from $2,000 to $15,000+; duct sealing remediation $500–$5,000+; fire damper installation $200–$800 per damper; duct cleaning $300–$1,000+.
Gap 1 Annual Value (C-43 CSLB search, CEC HERS duct leakage advisory, CBC § 717 fire damper confirmation, duct contamination assessment, § 1782 demand)
$1,575–$2,625/yr
5 clients × 2.1 calls × 60 min × 50% untracked = 5.25 hrs/yr at $300–$500/hr median solo rate

Billing Gap 2 — Active Litigation: HVAC/Mechanical Engineer, HERS Rater, Three-Track Harm Analysis, and Settlement Valuation (4.00 hrs/yr = $1,200–$2,000)

The second billing gap covers expert coordination across the duct leakage, fire damper, and duct contamination harm tracks.

  • Retaining a CEC-certified HERS Rater — to perform post-installation duct leakage testing confirming CEC Title 24 Part 6 non-compliance and quantifying the duct sealing remediation scope: the HERS Rater provides the CF3R compliance documentation confirming duct leakage deficiency and a remediation cost estimate for duct sealing and re-testing.
  • Retaining a licensed mechanical engineer — to confirm CBC § 717 fire damper omissions at fire-rated assembly penetrations, quantify the fire damper installation remediation cost, and assess duct contamination IAQ harm from improperly sealed ductwork: the mechanical engineer assesses all three harm tracks and prepares a comprehensive damages estimate.
  • Analyzing the three-track harm — (Track 1) duct leakage energy loss with annual utility cost premium; (Track 2) fire damper omission fire-rated assembly breach remediation; (Track 3) duct contamination IAQ harm — and integrating all three tracks into the CLRA § 1780 damages narrative: three-track integration generates litigation-phase advisory hours for expert coordination.
  • Settlement valuation incorporating § 7031(b) disgorgement, CLRA § 1780 actual damages across all three tracks, and CLRA § 1780 mandatory attorney fees: the multi-track C-43 settlement demand generates advisory hours specific to the sheet metal specialty's unique three-track damages architecture.
Gap 2 Annual Value (mechanical engineer, HERS Rater, three-track harm analysis, settlement valuation)
$1,200–$2,000/yr
4 clients × 2 calls × 60 min × 50% untracked = 4.00 hrs/yr at $300–$500/hr median solo rate

Billing Gap 3 — CLRA § 1780 Fee Petition, Pure Ketchum Multiplier, Lodestar Documentation, and Missouri v. Jenkins Fees-on-Fees (4.00 hrs/yr = $1,200–$2,000)

The third billing gap covers fee recovery preparation across all three C-43 harm tracks.

  • Documenting the CLRA § 1780 lodestar from the CSLB C-43 License Check date: capturing CEC HERS duct leakage test advisory hours, HERS Rater engagement hours, CBC § 717 fire damper advisory hours, mechanical engineer coordination hours, duct contamination IAQ assessment hours, and three-track damages analysis hours as CLRA § 1780 fee-petition-eligible work.
  • Briefing the pure Ketchum multiplier: Ketchum factors: (a) contingency risk; (b) novelty/difficulty — CEC Title 24 Part 6 mandatory HERS duct leakage test analysis (CF3R compliance documentation review, HERS Rater coordination), CBC § 717 fire damper fire-rated assembly breach code analysis (UL 555 listing confirmation, mechanical engineer engagement), SMACNA duct construction standard deviations, three-track energy/fire/IAQ damages integration; (c) results obtained; Ketchum v. Moses 24 Cal.4th 1122 (2001).
  • Missouri v. Jenkins fees-on-fees for the fee petition: Missouri v. Jenkins 491 U.S. 274 (1989).
Gap 3 Annual Value (CLRA § 1780 fee petition, pure Ketchum multiplier, lodestar from C-43 search date, fees-on-fees)
$1,200–$2,000/yr
4 clients × 2 calls × 60 min × 50% untracked = 4.00 hrs/yr at $300–$500/hr median solo rate

Total Annual Billing Gap — Three-Gap Summary

  • Gap 1 (C-43 CSLB search, CEC HERS duct leakage advisory, CBC § 717 fire damper confirmation, duct contamination assessment, § 1782 demand): 5.25 hrs = $1,575–$2,625/yr
  • Gap 2 (mechanical engineer, HERS Rater, three-track harm analysis, settlement valuation): 4.00 hrs = $1,200–$2,000/yr
  • Gap 3 (CLRA § 1780 fee petition, pure Ketchum multiplier, lodestar documentation, fees-on-fees): 4.00 hrs = $1,200–$2,000/yr
  • Total: 13.25 hrs = $3,975–$6,625/yr untracked at $300–$500/hr median California solo practitioner rate

How ClaimHour fits California Bus. & Prof. Code § 7028 C-43 / CLRA § 1780 sheet metal contractor practice

For solo California plaintiff attorneys handling Bus. & Prof. Code § 7028 C-43 Sheet Metal Contractor matters — including CSLB License Check advisory, CEC Title 24 Part 6 duct leakage HERS testing coordination, CBC § 717 fire damper advisory, mechanical engineer engagement, duct contamination IAQ assessment, § 7031(b) disgorgement analysis, and pure Ketchum multiplier briefing — ClaimHour captures all advisory sessions in the background without a separate practice management system.

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Frequently Asked Questions

What is the California Energy Code Title 24 Part 6 duct leakage HERS testing requirement and how does an unlicensed CSLB C-43 Sheet Metal Contractor create energy code liability?

CEC Title 24 Part 6 requires new and qualifying replacement HVAC duct systems to undergo HERS (Home Energy Rating System) duct leakage field verification by a CEC-certified HERS Rater before building permit final inspection. The HERS Rater measures total duct leakage to outside conditioned space (maximum 6% for new construction) and files a CF3R compliance form with the building department. An unlicensed C-43 contractor who installs ductwork without HERS verification creates a CEC compliance deficiency preventing permit final and a TDS disclosure obligation in future sale — unique to C-43 sheet metal duct matters and distinct from any HVAC equipment sizing or other energy code advisory in the fee-petition-mechanics series.

How does the California Building Code § 717 fire damper advisory create unique pre-complaint hours in a CSLB C-43 Sheet Metal Contractor fee petition?

CBC Section 717 requires UL-listed fire dampers (UL Standard 555) wherever HVAC ductwork penetrates fire-rated assemblies: fire barriers, fire partitions, horizontal assemblies, and smoke barriers. An unlicensed C-43 contractor who installs ductwork through fire-rated walls without fire dampers creates a fire-rated assembly breach requiring remediation. The fire damper advisory generates pre-complaint hours for fire-rated assembly duct penetration inventory, fire damper confirmation, mechanical engineer engagement, and remediation cost quantification as CLRA actual damages — unique to C-43 sheet metal matters in the fee-petition-mechanics series.

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