It is the question that comes right after “how much?”: do you need a permit for a metal building in Michigan? For most garages, workshops and pole barns the answer is yes. For some small sheds and many farm buildings it is no. And for carports it depends on where you live. The confusion comes from the fact that two separate systems apply, state building code and local zoning, and they answer different questions. These seven rules explain both, using the state’s own sources.
1. The default rule: a permit comes before construction
Michigan’s construction code law, MCL 125.1510, says that unless the code provides otherwise, the owner or the owner’s builder must apply to the enforcing agency for a building permit before constructing a building or structure. The application includes a written specification, scaled plans, a site plan showing the structure’s size and location relative to other buildings, the owner’s name and the intended use.
In other words, the starting assumption is that a new building needs a permit, and a permit for a metal building is no exception. You look for an exemption from there.
2. Small structures may not need a permit for a metal building
The Michigan Residential Code exempts certain minor work from a building permit. Under the current rule, Mich. Admin. Code R 408.30505 (effective August 29, 2025), one-story detached accessory structures are exempt if the floor area does not exceed 200 square feet.
Two cautions. That limit is small: a 12′ x 16′ shed qualifies, but a 12′ x 20′ carport (240 square feet) does not. And the code states that an exemption does not authorize work that violates the code or local ordinances, so zoning rules still apply.
3. Many farm buildings do not need a building permit
The same state law provides that a building permit is not required for a building incidental to the agricultural use of the land it stands on, as long as the building is not used in the business of retail trade. A hay barn or machine shed on a working farm will often qualify. A shop where you sell products, or a garage on a residential lot, will not.
Because the exemption depends on how the land and the building are used, ask your building department to confirm it for your project in writing. Zoning, setbacks and any electrical work still need their own approvals.
4. Who issues your permit depends on your address
Michigan’s Bureau of Construction Codes explains on its building permit information page that applications go to the enforcing agency for your location. That may be your city, village or township, your county, or the state itself, and the Statewide Jurisdiction List shows which one applies. To apply for a permit for a metal building, start with your local building department; if it does not issue building permits, it will tell you who does.
5. Zoning is a separate question from the permit for a metal building
Even when no building permit is needed, local zoning still decides where a structure can go and how big it can be. Typical zoning rules cover:
- Setbacks from property lines, roads, wells and septic fields
- Maximum size or height of accessory buildings, sometimes tied to lot size or the size of the house
- Location, for example no accessory buildings in the front yard
- Appearance in some subdivisions, along with private deed restrictions or HOA rules
Some townships issue a separate zoning or land-use permit. Check zoning before you settle on a size; it is the step most likely to change your plans.
6. Carports: open and enclosed can be treated differently
Local practice varies more for carports than for any other building. Some jurisdictions require a permit for any structure over a certain size, while others treat an open carport differently from an enclosed garage. Adding walls to an existing carport can also trigger the need for a permit for a metal building. You can compare open and enclosed designs on our metal carports page.
7. Engineered drawings make the permit for a metal building easier
Where plans are required, the reviewer wants to see that the structure meets the snow and wind loads for your location. Michigan publishes ground snow loads by county, from 20 psf in parts of the southeast to 100 psf in parts of the Keweenaw; our guide to Michigan snow load requirements lists them by region.
Every structure we install is engineered to meet or exceed the snow load and wind rating for its county and comes stamped by a licensed engineer, which is exactly the documentation most departments ask for.
Step by step: getting a permit for a metal building
- Call the building and zoning office with your address, building size, use and location on the lot.
- Confirm zoning first: setbacks, size limits and any zoning permit.
- Get your site plan ready, showing the building and its distances to property lines and other structures.
- Collect the engineered drawings for the building.
- Submit the application and fee to the enforcing agency.
- Schedule inspections as required, typically for footings or anchoring and at completion.
- Pull trade permits separately for electrical, plumbing or mechanical work.
We help confirm exactly what your permit for a metal building requires before your project starts and can guide you through the process.
Permit for a metal building: quick answers
Do I need a permit for a carport in Michigan?
Often, but not always. Carports over 200 square feet do not fall under the small-structure exemption, and local rules vary. Ask your building department.
Do I need a permit for a pole barn on my farm?
Possibly not, if the building is incidental to agricultural use and not used for retail trade. Zoning and setbacks still apply.
What happens if I build without a permit for a metal building?
You risk fines, stop-work orders, being required to remove or modify the building, and problems when you sell or insure the property.
Does a DIY kit need a permit too?
Yes. The rules depend on the structure, not on who builds it. Our FAQ page covers kits and installed buildings.
Get help with your permit for a metal building
Tell us your address and the building you have in mind, and we will check the requirements and provide stamped drawings for your application. Request your free, itemized quote or call (313) 986-1014 and a Michigan-based specialist will get back to you within one business day.
This article is general information. Permit, zoning and exemption requirements for your specific property should be confirmed for your property with our team and your local building department.
