Michigan Builder License vs HVAC License — Which One Do You Need?

Two Different Licenses for Two Different Scopes

Michigan separates construction work into distinct trade-specific licensing categories, and the line between a Residential Builder license and a Mechanical Contractor license trips up contractors regularly. Both are issued by LARA's Bureau of Construction Codes, but they cover fundamentally different scopes of work — and holding one doesn't give you the authority granted by the other.

What the Residential Builder License Covers

A Michigan Residential Builder license authorizes you to construct, alter, or repair residential structures. This includes framing, roofing, siding, drywall, painting, and general carpentry. It's the license for general contractors who manage the overall construction of a home or renovation project.

The builder license has a notable threshold: residential alterations valued at less than $600 are exempt from the licensing requirement. This is the general construction exemption under the Occupational Code that many contractors reference.

What the builder license does not cover is any work regulated by Michigan's three specialty trade boards: mechanical, electrical, and plumbing. A licensed residential builder cannot legally install a furnace, wire an electrical panel, or connect a water heater — even if the builder is managing the overall project.

What the Mechanical Contractor License Covers

The Mechanical Contractor license, regulated under Article 8 of the Skilled Trades Regulation Act (PA 407 of 2016), specifically authorizes heating, ventilation, air conditioning, refrigeration, and related mechanical system work. It covers equipment installation, ductwork, hydronic systems, refrigeration, and fire suppression — depending on which of LARA's ten classifications you carry.

The $600 general construction exemption does not apply to mechanical work. HVAC installations, alterations, and replacements performed for compensation generally require the appropriately classified Mechanical Contractor license, regardless of the project value, subject to narrow statutory exceptions.

When You Might Need Both

If you're a general contractor who builds homes and wants to handle the HVAC installation in-house instead of subcontracting it, you need both licenses. Each has its own application process, examination requirements, and renewal cycle.

The reverse applies too. A Mechanical Contractor who expands into general remodeling — say, finishing a basement that includes new ductwork and furnace installation — would need a Residential Builder license for the framing and drywall work, separate from their mechanical credential.

In practice, most HVAC contractors subcontract the general construction work and vice versa. Holding dual credentials is less common because the requirements don't overlap: the builder license requires 60 hours of approved prelicensure education before its exam, while the mechanical license requires 6,000 hours of hands-on mechanical work per classification.

Key Differences at a Glance

• Builder license — general construction, $600 threshold exemption, Occupational Code
• Mechanical license — HVAC/refrigeration specialty work, no value exemption, Skilled Trades Regulation Act
• Permitting — builders pull building permits, mechanical contractors pull mechanical permits; they're processed by the same local building department but under different code categories
• Cross-trade boundaries — neither license authorizes electrical or plumbing work

Bottom Line

If your compensated work involves installing, replacing, or servicing HVAC equipment in Michigan, you generally need the appropriately classified Mechanical Contractor license — a builder license doesn't cover it, regardless of project size, subject to statutory exemptions such as the owner-occupant rule. The Michigan HVAC License Guide covers the full mechanical licensing pathway, including how the specialty trade classifications work and where the boundaries sit between mechanical, electrical, and plumbing scopes.

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