Michigan Residential Building Code Requirements and Permits

The Michigan Residential Building Code is the state’s minimum standard for building, altering, or demolishing one- and two-family homes and townhouses up to three stories. It is based on the 2015 International Residential Code with Michigan amendments that address the state’s deep frost line, heavy snow loads, and cold-climate energy demands. The Department of Licensing and Regulatory Affairs (LARA), through its Bureau of Construction Codes, adopts and enforces it statewide. In January 2025, LARA announced it would update to the 2024 edition of the IRC, so anyone starting a project should confirm which version applies in their jurisdiction.¹

The code covers new construction, renovations, additions, and demolition. Any significant change to an existing home — adding a room, altering the roof structure, converting a garage — triggers compliance with current code requirements for the scope of that work. Where the code references documents like the “International Building Code” or “International Energy Conservation Code,” it means their Michigan-adopted counterparts.²

Getting a Building Permit

Almost all residential construction, alteration, or demolition requires a permit before work begins. Applications go to the enforcing agency, which is usually your local building department. The agency must grant, partially grant, or deny your application within 10 business days, or 15 business days for unusually complex projects. If it misses that deadline, the application is treated as denied and you can appeal.³

A complete application includes two sets of construction documents drawn to scale, a written description of the project specifications verified by affidavit, and a site plan showing where the work sits in relation to other structures on the property. For most one- and two-family homes under 3,500 square feet, an architect or engineer seal is not required. Above that threshold, construction documents must be sealed and signed by a licensed architect or professional engineer.⁴

Fees vary by jurisdiction and are typically based on project valuation or square footage. Expect separate charges for the building permit, for plan review, and for trade permits covering electrical, plumbing, and mechanical work. A permit can be suspended or revoked if you fail to comply with the code or if the application contained false statements.³

Building on Your Own Property

Michigan lets property owners build or alter structures on their own land without a residential builder’s license, as long as the work is for the owner’s own use and occupancy.⁵ The exemption is narrow: you still need permits, you still need to pass every inspection, and you still have to comply with every code provision. You just don’t need a builder’s license to do the work yourself.

There are conditions on this. If you build a home as an owner-builder, you must either move into it once it receives a certificate of occupancy or, if unforeseen circumstances prevent that, put it up for sale. You cannot use the unforeseen-circumstances exception more than once per calendar year. And if you do move in, you cannot sell the home for at least 365 days after you begin living there.⁶ These rules exist to keep the exemption from being used to flip homes as a business.

Core Construction Standards

Foundations and Frost Depth

Michigan’s frost line drives the code’s most distinctive foundation rule: all exterior footings and foundation systems must extend at least 42 inches below grade.⁷ This protects the foundation from frost heave. Your local building official may adjust requirements based on soil type, groundwater, snow depth, and site exposure, but 42 inches is the statewide baseline.

Structural, Snow, and Wind Loads

Load-bearing elements — walls, beams, headers, connections — must be designed for Michigan’s environmental stresses, including roof snow accumulation and wind pressures that vary by region. The code specifies framing, fastener schedules, and bracing methods calibrated to those conditions. Concrete strength and reinforcement requirements are tied to the soil and loads at your specific site.

Smoke Alarms and Sprinklers

Smoke alarms are required in every bedroom, outside each sleeping area, and on every level of the home including the basement. One point that surprises many builders: Michigan opted out of the IRC’s residential fire sprinkler provisions (Sections R313.1.1 through R313.2.1), so automatic sprinkler systems are not required in one- and two-family homes under the state code.² Local jurisdictions may have their own sprinkler rules, but the state code does not impose them.

Energy Code Minimums

Michigan enforces its own version of the International Energy Conservation Code through the Michigan Uniform Energy Code, which sets insulation minimums, air-sealing standards, and HVAC efficiency requirements.⁸ Most of the state falls in Climate Zone 5a; the Upper Peninsula and parts of the northern Lower Peninsula sit in Zone 6, which is stricter.

For Climate Zone 5a, the prescriptive insulation minimums are:⁹

Attic ceilings: R-38, reducible to R-30 with a raised-heel energy truss
Ceilings without attic space: R-30
Wood-frame walls: R-20 cavity, or R-13 cavity plus R-5 continuous exterior insulation
Floors over unconditioned space: R-30, or R-19 minimum if filling the framing cavity
Conditioned basement walls: R-10 continuous or R-13 cavity
Slab-on-grade floors: R-10 extending two feet below grade from the slab edge
Conditioned crawl space walls: R-15 continuous or R-19 cavity

Duct insulation must be at least R-6 for ducts inside the building but outside conditioned space, and R-8 for ducts running outside the building entirely.⁸ Air-sealing the building envelope is mandatory. Builders may use an Energy Rating Index as an alternative compliance path, where 100 represents a baseline home and 0 represents a home using no net purchased energy.

Inspections and the Certificate of Occupancy

Inspections happen at critical stages: foundation, framing, rough-in for electrical, plumbing, and mechanical systems, insulation, and final. State-certified inspectors verify that each phase meets code before you can move to the next.¹⁰

Once everything covered by the permit is complete and passes final inspection, you apply for a certificate of use and occupancy. The enforcing agency must issue it within five business days after receiving your written application and fee, assuming the building qualifies. You cannot legally occupy a newly constructed home without it.¹¹

If you need to move in before all work is finished, you can request a temporary certificate. The agency can grant one if the portions you’ll occupy are safe. The agency must give at least 12 hours’ notice before conducting any final inspection.¹¹

Penalties for Building Without a Permit or Violating the Code

Knowingly violating the construction code, building outside your permit conditions, or ignoring an order from the enforcing agency is a misdemeanor punishable by a fine of up to $500, up to 90 days in jail, or both. Penalties stack. Ignoring a stop-work order counts as a new offense for each day work continues. Failing to comply with any other agency order counts as a separate offense for each week of noncompliance.¹²

The same statute reaches false statements on applications, refusing entry to a lawful inspector, interfering with an inspection, and concealing known violations. Each instance is a separate misdemeanor count. Beyond the criminal side, the agency can suspend or revoke your permit for noncompliance or false representations.³ For licensed builders, repeated violations can lead to license suspension or revocation.

Appealing a Building Official’s Decision

If a building official denies your permit, orders work stopped, or makes another decision you disagree with, you can appeal in writing to the local construction board of appeals. The board must hear your appeal and issue a written decision, with reasons, within 30 days of submission.¹³ A copy of the decision is delivered or mailed to you before it’s officially filed.

If the local board fails to act within 30 days, the law treats the inaction as a denial, opening the door to appeal directly to the state Construction Code Commission.¹³ No building official’s decision is the last word, and the 30-day clock is what gives you leverage.

Who Needs a Builder’s License

Anyone who builds or alters residential structures for others in Michigan must hold a residential builder’s license or work under someone who does. Applicants complete 60 hours of approved prelicensure courses (at least six hours in each of seven required areas) before sitting for the exam, covering business management and job costing, design and building science, contracts and risk management, marketing and sales, project management, the current Michigan residential code, and construction safety under MIOSHA.¹⁴ Veterans who served in construction-related roles may be exempt from the coursework if they can document entry-level experience in each area, but they still must pass the exam.

Several categories fall outside the licensing requirement entirely: owners working on their own homes, licensed trade contractors working within their specialty (electricians doing electrical work, plumbers doing plumbing), government representatives acting officially, and anyone performing work under $600 in total contract price.⁵ That $600 threshold cannot be split across smaller contracts to duck the rule.

1
State of Michigan. Michigan Residential Code Notification Adopting 2024
2
Michigan Legislature. Part 5 Residential Code
3
Michigan Legislature. MCL Section 125.1511
4
State of Michigan. Building Permit Application BCC-324
5
Michigan Legislature. MCL Section 339.2403
6
Michigan Legislature. Michigan Compiled Laws 445.885 – Owner-Builder Residing in Residential Structure
7
Cornell Law School. Michigan Admin Code R 408.30522 – Minimum Depth
8
Michigan Legislature. Part 10 Michigan Uniform Energy Code
9
State of Michigan. Residential Energy Code – Michigan Climate Zone 5a Checklist
10
State of Michigan. Plan Review Information
11
Michigan Legislature. MCL Section 125.1513 – Certificate of Use and Occupancy
12
Michigan Legislature. MCL Section 125.1523
13
Michigan Legislature. MCL Section 125.1514 – Construction Board of Appeals
14
Michigan Legislature. MCL Section 339.2404b – Licensure as Residential Builder or Residential Maintenance and Alteration Contractor