California sheet metal workers comp splits payroll by regular hourly wage for policies from September 1, 2026: the published sheet metal work pair divides at $37.00 an hour, 5538(1) below it and 5542(1) at or above it. HVAC duct has its own published pair, so a shop that also runs duct may report in both, depending on duties and the carrier's determination.
Sheet metal contractors in California are licensed as C-43 Sheet Metal, and the CSLB requires workers comp as soon as a C-43 shop has one employee. A C-43 holder with nobody else on payroll may file an exemption for now, but that choice is scheduled to end on January 1, 2028, and a CSLB report has proposed keeping a narrower version. The California contractor workers comp rules follow that change and list the license classes already required to carry coverage.
| Rule | What It Means for a Sheet Metal Shop | Source |
|---|---|---|
| One employee | Coverage is required once a single installer or shop hand is on payroll. | CSLB |
| No-employee exemption | Available to a C-43 holder working alone today; scheduled to end on January 1, 2028. | Business and Professions Code 7125 |
| Penalties under SB 291 | A false exemption or uncovered employees can bring a minimum civil penalty of $10,000 per violation for a sole owner licensee and $20,000 for an entity. | Business and Professions Code 7125.4 |
| Helpers without a license | A person installing gutters or flashing for you on licensed work, with no contractor license of their own, is presumed to be your employee. | Labor Code 2750.5 |
| Owners on the policy | An officer or director with at least 10% ownership may waive coverage once the insurer accepts it. | Department of Insurance notice |
| Wage line | Sheet metal and duct payroll both split at $37.00 an hour. | WCIRB |
Whether an owner stays covered is a decision to confirm with the carrier. Crews that also work across the state line answer to different rules, set out in sheet metal workers comp quotes and Nevada sheet metal industrial insurance.
The WCIRB's sheet metal work pair is the general home for installed sheet metal that no narrower classification describes, such as gutters, flashing, flues and kitchen hoods. Its notes keep shop fabrication with the installation when you install part of what you make. For policies from September 1, 2026, the pair divides at $37.00 an hour.
$37.00 an hour is the line between these published classifications
Published classifications that mention this work
Duct for heating and air conditioning isn't part of this pair. The WCIRB places it in the ductwork pair, 5538(2) and 5542(2), which uses the same wage line and also takes in equipment set where the shop runs duct; workers comp for HVAC contractors in California explains that split. Metal roofing stays with sheet metal only when the same employer skins a new building at that job, and pipe is classified separately, as workers comp for plumbers in California shows for plumbing pipe. The full list is on the California workers comp class codes page.
Illustrative scenario
Suppose a C-43 shop with five installers: three paid at or above $37.00 an hour and two below it. Their gutter, flashing and kitchen hood work is reported in the sheet metal work pair, three on the higher-wage side and two on the lower. Then the shop runs supply and return duct in a restaurant remodel. Those hours may move to the ductwork pair; the wage line is the same, so each installer stays on the same side, but the code changes. Take the shop to Arizona or Nevada and the example falls apart: those states use NCCI classifications, and neither California pair carries over.
Reporting Duct Hours as Sheet Metal Work
Sheet metal shops often put every installer's hours under 5538(1) and 5542(1), duct jobs included. The WCIRB gives heating and air conditioning duct its own pair, so an auditor reading invoices for duct may move those hours.
With the job and payroll records sorted, get a California sheet metal workers comp quote.
Workers comp addresses injuries to your employees. A flashing leak into a client's building, a crash while hauling coil stock or an unfinished-job claim typically falls to general liability, commercial auto or a contractor's bond.
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The panel shows the WCIRB's sheet metal work pair, 5538(1) under $37.00 an hour and 5542(1) at or above it, for policies from September 1, 2026. Duct for heating and cooling has a separate pair. Which applies to each installer depends on duties and the carrier's determination; we don't assign or confirm codes.
Not under the WCIRB's published notes. Duct for heating or air conditioning goes to its own pair, 5538(2) and 5542(2), even when a sheet metal shop does it. Both pairs split at $37.00 an hour, so the wage side may stay the same while the code changes.
Often, yes. The WCIRB's notes keep fabrication in your own shop with the installation classification when you install some of the items you make. A shop that fabricates for others without installing may be classified another way, depending on the carrier's determination.
Only in a narrow case. The WCIRB's notes keep metal roofing with sheet metal when the same employer also skins a new building or addition at that job; other roofing is classified separately. List roofing jobs on their own.
Not yet, if the C-43 holder files the CSLB's no-employee exemption. That exemption is scheduled to end on January 1, 2028, and the CSLB has suggested keeping a narrower one, so the rule could still change.
Usually. Labor Code 2750.5 presumes that a person doing licensed work for a contractor is an employee unless that person holds their own contractor license. If the helper has no license, expect the auditor to count the pay, and confirm with the carrier how it will be reported.
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California sheet metal workers comp, from the wage line to the duct split.
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