Do I Need a Permit to Build a Deck in Michigan?

Michigan's statewide residential code

Michigan enforces a statewide building code through the Bureau of Construction Codes within the Department of Licensing and Regulatory Affairs (LARA). The Michigan Residential Code (MRC) governs all one- and two-family dwelling construction in the state, including deck projects.

The current MRC is based on the 2015 International Residential Code (IRC) with Michigan-specific amendments. These amendments modify several provisions of the base IRC, including the deck permit exemption, flashing requirements, and submittal document standards.

Michigan's building code enforcement is somewhat unusual in that it's administered at multiple levels. Depending on where you live, your building permits may be handled by a city building department, a county building department, or the state itself. LARA maintains a Statewide Jurisdiction List that identifies the enforcing agency for every jurisdiction in Michigan. Before applying for a permit, check this list to confirm which agency handles permits for your property's location.

Deck permit requirements vary significantly across the country — see our national deck permit guide for how Michigan compares to other states.

When you need a permit

Michigan's permit exemption for decks is defined in Rule 505 of the Michigan Residential Code (Section R105.2, as amended). A deck is exempt from a building permit only if it meets all of the following conditions:

• Does not exceed 200 square feet in area
• Is not more than 30 inches above grade at any point
• Is not attached to the dwelling or its accessory structures
• Is not within 36 inches of the dwelling or its accessory structures
• Does not serve any ingress or egress door of the dwelling or its accessory structures

That 36-inch setback requirement is the key difference from most other states. In Ohio, Georgia, or North Carolina, a freestanding deck that's not attached to the house can qualify for the exemption as long as it meets size and height limits. In Michigan, the deck must also be physically separated from the house by at least 36 inches. A floating deck built right against the back wall of your house — even if it's small, low, and structurally independent — still requires a permit in Michigan.

This strict interpretation means that the vast majority of useful residential decks in Michigan require a building permit. The only decks that qualify for the exemption are small, low, freestanding platforms set several feet away from the house — essentially a standalone patio alternative.

Even when a building permit is not required, the work must still comply with all applicable code provisions. And a zoning permit may still be required in many jurisdictions.

Michigan's 42-inch frost depth

Michigan's cold winters make frost depth the single most impactful factor in deck construction costs. The minimum frost depth for most of Michigan is 42 inches, meaning deck footings must be dug nearly four feet deep to get below the frost line.

This applies across most of the state — from Detroit and Ann Arbor in the southeast to Grand Rapids in the west to Traverse City in the north. The Upper Peninsula may require even deeper footings in some areas.

The 42-inch frost depth has a cascading effect on construction. Footing holes must be dug to at least 42 inches (and typically a few inches deeper to ensure clearance), which means:

• Significantly more excavation labor than in southern states where 12 to 18 inches is sufficient
• Larger volumes of concrete per footing
• Potential need for power auger equipment rather than hand digging, especially in Michigan's clay-heavy soils
• More complex logistics for accessing footing locations in tight spaces

The frost depth requirement cannot be waived. Footings placed above the frost line will heave as the ground freezes and thaws through Michigan's winter cycle, causing the deck to shift, crack, and eventually fail. Building inspectors verify footing depth at the footing inspection — a footing that's too shallow will not pass.

Snow loads and structural design

Michigan's design ground snow loads are among the highest in the lower 48 states, and they vary significantly across the state. The East Lansing area uses a minimum design ground snow load of 30 pounds per square foot (psf). Lake-effect snow zones along the western shore and in the Upper Peninsula can see even higher design loads.

Snow load directly affects deck framing design. Every joist, beam, and footing must be sized to support not just the standard 40 psf live load and 10 psf dead load, but also the accumulated weight of snow. This means Michigan decks often require larger lumber, closer joist spacing, or wider footings compared to the same deck built in a southern state.

The combination of deep frost footings and high snow loads means that Michigan deck construction costs are inherently higher than in moderate-climate states — not because of permit fees or bureaucracy, but because of the structural demands of the climate.

Detroit and the southeast Michigan suburbs

Detroit processes building permits through its Buildings, Safety Engineering, and Environmental Department (BSEED). The city follows the Michigan Residential Code and requires permits for deck construction that exceeds the standard exemptions.

Detroit's permitting process has improved in recent years with the adoption of online submission options, though the city's building department handles a large volume of applications. Review times for residential deck permits in Detroit typically range from two to four weeks, though complex projects or periods of high volume may take longer.

The southeast Michigan suburbs — including Warren, Sterling Heights, Dearborn, Livonia, and Troy — each have their own building departments and handle deck permits independently. These suburban communities generally have well-organized permitting processes with review times of one to three weeks for straightforward residential deck projects.

Dearborn is worth noting because of its diverse housing stock and relatively dense construction. Setback requirements on smaller lots can constrain deck placement, and the city's building department may scrutinize lot coverage and impervious surface calculations more closely than suburban communities with larger lots.

Grand Rapids and western Michigan

Grand Rapids is Michigan's second-largest city and processes permits through its Development Center. The city follows the MRC and requires permits for most deck construction.

Western Michigan's proximity to Lake Michigan introduces lake-effect snow as a design consideration. Ground snow loads in the Grand Rapids area and the lakeshore communities can be higher than in southeast Michigan, which may affect joist and beam sizing.

Grand Rapids and surrounding communities like Walker publish residential deck permit guides that outline requirements and provide design guidance. The City of Walker's guide specifies that all deck materials exposed to weather must be pressure-treated or decay-resistant, and that footings require a 42-inch minimum ground cover — consistent with the statewide standard.

Permit fees in the Grand Rapids area are typically based on project value, including materials and labor, plus a zoning review fee. For a typical residential deck, fees generally fall between $100 and $300.

Ann Arbor and the university towns

Ann Arbor has a reputation for thorough code enforcement and can have longer review times than surrounding communities. The city's building department follows the MRC but applies careful scrutiny to setbacks, lot coverage, and stormwater management — particularly in older neighborhoods near the university where lots are smaller and density is higher.

Lansing, the state capital, follows the MRC with review times typical of mid-size Michigan cities — usually one to three weeks for residential deck permits. East Lansing, home to Michigan State University, publishes a detailed wood deck construction guide that specifies a minimum footing depth of 42 inches and a design ground snow load of 30 psf.

Licensed contractors in Michigan

Michigan has strict contractor licensing requirements. Any person engaged in the construction of a residential structure must be licensed as a Residential Builder with LARA. This includes deck construction. There are limited exceptions: a homeowner who occupies or will occupy the home may perform work on their own residence and obtain permits in their own name.

If you hire a contractor, verify that they hold a valid Michigan Residential Builder's license. You can check a contractor's license status through LARA's online license verification system. An unlicensed contractor cannot legally pull a permit in Michigan.

This licensing requirement is enforced statewide, regardless of which local agency handles the building permit.

Applying for a deck permit in Michigan

The application process depends on which enforcing agency covers your property — city, county, or state. Most jurisdictions require:

• A completed building permit application
• A site plan or plot plan showing all structures on the property, property lines, distances from the proposed deck to all property lines and structures, power lines, and driveways
• Construction drawings showing dimensions, framing layout, lumber sizes and species, post spacing, footing depth and size, ledger board attachment details, and railing specifications
• For some jurisdictions, a list of design load criteria including live load, dead load, snow load, and wind speed

Michigan does not require construction documents for one- and two-family dwellings to be sealed by a registered architect or professional engineer, unless the dwelling exceeds 3,500 square feet. For most residential deck projects, homeowner-prepared drawings are acceptable as long as they include all required information.

Many Michigan communities now accept online permit applications. Waterford Township, for example, requires a site plan review that takes two to three weeks, followed by permit issuance.

Fees across Michigan vary. Smaller communities may charge $50 to $150 for a basic deck permit. Larger cities like Detroit and Grand Rapids charge $100 to $300 or more depending on project value. Most suburban communities fall in the $100 to $250 range.

Inspections

Michigan municipalities typically require at least two inspections for deck construction:

• Footing inspection: Before concrete is poured. The inspector verifies that holes are dug to the required 42-inch depth (or deeper in some areas), are properly sized for the tributary load, and rest on undisturbed soil. In Michigan's clay-heavy soils, the inspector also checks that standing water hasn't compromised the soil bearing conditions.
• Final inspection: After the deck is complete. The inspector checks structural connections, guardrail height and baluster spacing, stair dimensions, ledger flashing, and overall compliance with the approved plans.

Some jurisdictions add a framing inspection. In East Lansing, the building department specifically notes that ladders, scaffolds, and testing equipment required for inspections must be provided by the permit holder.

What happens if you skip the permit

Michigan enforces unpermitted construction through both local building departments and the state's Bureau of Construction Codes. Penalties include fines, stop-work orders, and requirements to obtain retroactive permits — often at significantly increased fees.

The state's contractor licensing system adds an additional enforcement mechanism. A licensed Residential Builder who performs work without obtaining the required permits risks disciplinary action from LARA, including fines, license suspension, or revocation.

For homeowners, unpermitted decks create the same practical problems as in other states: potential insurance coverage gaps, complications during home sales, and the risk that the structure doesn't meet code and may need to be modified or removed.

Michigan homeowners should also be aware that the state's strong union and trade-oriented building culture means that building inspectors tend to be thorough and detail-oriented. Trying to sneak a deck past the system rarely works, especially in urban and suburban communities with active code enforcement.

For an overview of all building permit requirements in Michigan — including sheds, fences, pools, and more — see our complete Michigan building permit guide.

If you're also planning a fence or patio alongside your deck, note that Michigan has separate permit requirements for each — see our guides to fence permits in Michigan and patio permits in Michigan.