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Michigan commercial carpentry contractor insurance combines workers' compensation classified correctly for framing and finish work, general liability with the additional insured and completed operations terms your general contractors require, a tools and equipment floater, commercial auto, and an umbrella. Michigan does not license commercial carpenters or require them to carry insurance, but any carpentry contractor doing commercial work needs at least $1 million per occurrence and $1 million aggregate.
The short version: No state law makes a commercial carpenter buy insurance, and no GC will let you on site without it. Your largest cost is workers' comp, and the biggest classification risk is commercial work getting mixed with residential carpentry, which Michigan rates higher. Your largest liability exposure is a fall — yours or someone else's.
You do not need a license. You do need insurance.
Michigan's builder license covers residential work only; commercial carpentry has no state license. That is not a reason to go without coverage. If your crews are working at all, you need to be insured:
- Workers' comp is the law. It applies once you have three or more employees, or even one working 35 hours a week for 13 weeks (MCL 418.115).
- General contractors require it. No certificate of insurance with the right additional insured wording, no subcontract and no payment.
- A single fall can exceed what a carpentry company can absorb. And your completed work stays your exposure for years.
Falls are the exposure that drives everything
According to the Bureau of Labor Statistics, the private construction industry recorded 1,034 workplace deaths in 2024, and 389 of them were falls, slips and trips — nearly 96% of those falls to a lower level. In Michigan, fall protection topped MIOSHA's list of most-cited serious construction violations in fiscal 2023, and unprotected sides and edges ranked third.
Michigan's construction fall protection rule (MIOSHA Part 45) adopts the federal standard: workers 6 feet or more above a lower level must be protected. Scaffolds, ladders and aerial lifts fall under their own MIOSHA standards. A carpentry firm with a written fall protection program, documented training and real enforcement is a better workers' comp risk, and underwriters ask about all three.
Falls are also a liability story. In a case from a Lake Orion school project, a carpenter who fell while moving drywall onto a mezzanine sued the construction manager; a jury found the CM 55% at fault, and the Michigan Court of Appeals upheld the verdict in 2014 in an unpublished decision. The GC and CM above you will push that exposure back to your policy through the subcontract. See our guide to general contractor and construction manager insurance for how that works from their side.
Michigan's carpentry class codes
Michigan rates workers' comp under its own manual (maintained by the Compensation Advisory Organization of Michigan), not the national NCCI system. For carpentry, the splits are specific:
- Code 5403, Carpentry NOC — generally commercial and industrial carpentry, including interior and exterior framing in wood or light-gauge steel, and residential buildings over three stories.
- Code 5437 — cabinet installation, interior trim, finished wood flooring, finished staircases, paneling and millwork. Finish carpentry on a commercial job belongs here, not in 5403.
- Code 5645 — carpentry on detached one- and two-family dwellings. On Michigan's assigned-risk rates it costs noticeably more than 5403 or 5437, which are close to each other.
- Shop work is separate. Cabinet and countertop manufacturing in your shop is 2812; other shop carpentry is 2802.
Michigan's manual has no code 5651, which national class-code sites often cite. Multi-family buildings of three stories or less that are not detached homes are a gray area in the manual; ask your carrier before assuming. If you do both commercial and residential work and your payroll records do not separate them, the auditor may put it all in the higher-rated residential class. Our post on Michigan workers' comp class codes covers how that plays out.
What GCs will require on your certificate
- Additional insured for ongoing and completed operations — CG 20 10 and CG 20 37, or the automatic forms CG 20 38 and CG 20 40, which also pick up the owner and others above the GC when the subcontract requires it.
- Primary and non-contributory wording and a waiver of subrogation.
- No prohibited exclusions. Contracts based on AIA documents commonly prohibit endorsements that exclude residential work, delete the subcontractor exception or exclude claims by injured employees. A carpentry sub with a carrier's residential or multi-unit exclusion working on a mixed-use building has a problem.
- Indemnity. Michigan voids indemnity only for the indemnified party's sole negligence (MCL 691.991). Indemnity for shared fault is enforceable. It is generally covered as an "insured contract" on your liability policy, unless the policy is endorsed with a contractual liability limitation such as CG 21 39.
When your work damages someone else's
The standard liability policy does not pay to tear out and redo your own defective framing or millwork. It is built for damage your work causes to other property: cabinets that pull off the wall and destroy finished countertops, a framing defect that cracks other trades' finishes. After the Michigan Supreme Court's 2020 decision in Skanska v MAP Mechanical, unintended faulty workmanship that damages other work can be an "occurrence" under the current standard form. Whether a specific claim is covered depends on your policy's endorsements and on whether the job was still in progress.
Your tools and equipment are not covered by liability at all. A contractor's equipment or tools floater covers theft and damage on the job and in the truck, and an installation floater covers materials and work in progress before the owner accepts them when builder's risk does not.
Frequently Asked Questions
Do commercial carpenters need a license in Michigan?
Not a state license. Michigan's residential builder and maintenance and alteration licenses apply only to residential structures, and LARA does not license commercial builders. Some cities have local registration rules. Insurance is still required in practice: general contractors require it, and workers' comp is required by law once you have three or more employees, or one working 35 hours a week for 13 weeks.
What workers' comp class code is commercial carpentry in Michigan?
Michigan's manual rates commercial and industrial carpentry, including framing, under code 5403. Cabinet installation, interior trim, finished wood flooring and finished staircases are code 5437. Carpentry on detached one- and two-family homes is 5645. Michigan has no code 5651.
At what height is fall protection required for carpenters in Michigan?
MIOSHA's construction fall protection standard requires protection for employees 6 feet or more above a lower level. Scaffolds, ladders and aerial work platforms are governed by their own MIOSHA standards.
Does general liability cover a faulty carpentry installation?
It does not pay to redo your own defective work. It is designed to cover damage your work causes to other property, such as other trades' finished work. After the Michigan Supreme Court's 2020 Skanska decision, unintended faulty workmanship that damages other work can be an occurrence under the standard form, subject to your policy's endorsements.
What limits do general contractors require from carpentry subs?
It varies by contract, but we treat $1 million per occurrence and $1 million aggregate as the minimum for an established carpentry contractor, with an umbrella above it. Larger commercial projects commonly require higher umbrella limits, completed operations additional insured status and a waiver of subrogation.
The bottom line
A carpentry contractor's program is decided by three things most quotes never show: whether your payroll is split correctly between framing and finish classes, whether your liability policy carries exclusions your GCs prohibit, and whether your additional insured wording covers completed work.
We work best with established Michigan commercial carpentry contractors — crews on payroll, commercial GC relationships, trucks and tools titled to the business, and a few years of loss runs. Send us your current declarations pages, your full schedule of forms, a recent subcontract's insurance requirements and your last two loss runs, and we will show you where the gaps are before we talk about price. J. Jacobs & Associates has insured Michigan contractors for more than forty years, and as an independent agency we take your program to multiple preferred commercial carriers. Call (248) 693-6455 or request a contractor review. Residential builders should see home builder and remodeler insurance.