Carport Permit Requirements in Michigan (2025)
A complete Michigan homeowner guide to carport permit requirements — which counties require them, how much they cost, what setbacks apply, and how to apply successfully.
| Quick Reference | |
|---|---|
| Exemption Threshold (Detached) | 200 sq ft in most townships |
| Attached Carport | Permit Required — No Exemption |
| Typical Permit Fee | $100–$250 |
| Key Rule | Michigan Building Code applies; township rules vary significantly |
Michigan Carport Permits: State Code with Local Enforcement
Michigan adopted the Michigan Building Code (MBC) — based on the IRC — which applies statewide to all residential construction. The key variable in Michigan is whether your property is in an incorporated city, village, or unincorporated township. Cities and villages typically enforce the MBC directly; townships may have their own enforcement offices or rely on county administration.
Key Michigan Jurisdictions
| County/City | Threshold | Typical Fee | Notes |
|---|---|---|---|
| Wayne County (Detroit) | City of Detroit: permit for all; suburbs: each city varies | $125–$300 | Each Detroit suburb (Dearborn, Livonia, Westland) has own building dept. |
| Oakland County | City/village: permit required; townships: typically 200 sq ft | $100–$250 | Oakland County one of highest-income in US; HOA density very high |
| Kent County (Grand Rapids) | City: permit required; townships: 200 sq ft typical | $100–$225 | Grand Rapids has streamlined online permitting system |
| Washtenaw County (Ann Arbor) | City of Ann Arbor: permit for all; townships: varies | $125–$275 | University community; permit enforcement consistent |
Michigan Frost Depth Requirements
Michigan is entirely within the frost zone, with frost depths ranging from 36 inches in the southern Lower Peninsula to 48+ inches in the Upper Peninsula. All carport footings must extend below the local frost depth — this is the most common inspection failure point in Michigan carport projects. Confirm your specific county's required frost depth before digging footing holes. This requirement applies even in unincorporated township areas where permits may not otherwise be required, if you voluntarily permit the structure.
Free: Carport Permit Application Checklist
Print before visiting your building department — covers every document and question to address upfront.
Download Free →FAQs: Michigan Carport Permits
In most Michigan counties, yes. Standard metal carport kits anchored with concrete require permits. The typical threshold is 200 sq ft in most townships for detached structures only — and most standard carport sizes exceed this. Call your county building department to confirm your specific situation.
Most Michigan counties review residential accessory structure permits in 5–14 business days. Submit a complete application — site plan, specs, and application form — to avoid delays from requests for additional information.
Setbacks vary by county and zone. Typical ranges: side yards 5–10 ft, rear yard 5–10 ft, front yard behind the dwelling's face. Use our setback calculator for an estimate, then confirm with your county zoning department.