Do I need a permit to replace my roof in Detroit?

If you're replacing more than 25 percent of the roof surface, yes. Full roof replacements always need a permit in Detroit. The permit is straightforward (typically over-the-counter or plan-review in under 2 weeks) and covers reroofing materials, flashing, and ventilation inspection. Replacing a few shingles or patching a small leak doesn't require a permit.

What's the frost depth for decks in Detroit?

42 inches. Any deck post, footing, or pier must be set below 42 inches to prevent frost heave. This is lower than the IRC minimum in some climates but is the standard for Detroit based on historical frost patterns. Your deck plan must specify footing depth and show below-frost-line detail. Footings sitting above the frost line are the #1 reason deck permits get rejected in Detroit.

Can I do electrical work myself in Detroit as an owner-builder?

For owner-occupied residential projects, Michigan allows owner-builders to perform some electrical work, but scope matters. Adding a 120V outlet or light fixture may fall under owner-builder exemption depending on complexity and local enforcement. Upgrading a panel, running circuits for a new room, or hardwiring appliances typically requires a licensed electrician. Call the Building Department before starting — a 5-minute conversation will clarify whether you need a licensed contractor or can pull an owner-builder permit.

How long does plan review take in Detroit?

Most straightforward permits (fences, small sheds, simple deck alterations) are processed over-the-counter in 1 to 2 days. Projects requiring full plan review — additions, basement finishing, major electrical upgrades — typically take 2 to 3 weeks. If the Building Department has corrections, plan for another week to resubmit and re-review. Seasonal delays are less common in Detroit than in some jurisdictions, but spring can see slower turnaround.

What if I do unpermitted work in Detroit?

The city has been active in enforcement. If code violations are found (during a title search, property inspection, or complaint), fines start at $500 per day of non-compliance. You may be required to obtain a retroactive permit, submit to reinspection, and remediate any code defects. In severe cases, unpermitted work can hold up a home sale or refinance. If you're inheriting an unpermitted project, contact the Building Department early to discuss options.

Do I need a permit for a fence in Detroit?

Most residential fences over 6 feet tall require a permit. All fences in front setbacks (typically 25–35 feet from the street, depending on zoning) need a permit regardless of height. Pool barriers must have a permit and meet 4-foot height and self-closing gate requirements. Fences under 6 feet in rear or side yards are often exempt — but corner-lot and pool-barrier rules override the exemption. Check your property's zoning and lot boundaries before assuming you don't need a permit.

Can I file a permit online in Detroit?

Detroit has an online permit portal, though many residential homeowners and contractors still file in-person at City Hall. Online filing is available; verify the current URL on the Detroit city website. In-person filing at 2 Woodward Ave is accepted and often faster for simple projects if staff can resolve questions immediately. Hours are Monday–Friday, 8 AM–5 PM.

What if my home was built before 1978 and I'm doing renovation work?

Michigan requires lead-safe work practices for any renovation disturbing paint or coatings in pre-1978 homes. You must obtain a lead-safe license, contain dust, use certified contractors for major disturbance, and disclose lead hazards to any buyer or renter. Lead-safe requirements can add 20–30 percent to renovation timelines and costs. Hiring a lead-certified contractor is the simplest path; many Detroit contractors are certified.

Building Permits in Detroit, MI (2026)

Do I need a permit in Detroit, MI?

Detroit's building permitting system is run by the City of Detroit Building Department, which handles all residential and commercial construction permits, inspections, and code compliance. Like most Michigan cities, Detroit operates under the Michigan Building Code (currently the 2015 edition with state amendments), which aligns closely with the International Building Code. The city sits in climate zones 5A to 6A depending on neighborhood — frost depth runs 42 inches, which matters for any footing work. Owner-builders can pull permits for owner-occupied residential projects, though some trades (electrical, plumbing, HVAC) may require licensed contractors depending on scope. The Building Department processes permits in-person and online. Understanding Detroit's specific thresholds and exemptions can save you thousands in unnecessary work or prevent costly fines if you skip a permit you actually need.

What's specific to Detroit permits

Detroit uses the Michigan Building Code with state-level amendments. The code edition is current and enforced consistently across the city. One critical difference from some other jurisdictions: Detroit's zoning regulations are separate from building permits. You may need a zoning variance or certificate of occupancy from the Planning Department even when your building permit is approved. Check both agencies before starting work, especially if you're changing a property's use or adding square footage.

Frost depth in Detroit is 42 inches — lower than the IRC minimum of 48 inches in some cold climates, but still deep. Any deck, shed, fence post, or foundation footing must go below the frost line to prevent heave damage over Michigan winters. The city's glacial-till and sandy soils (particularly in the north) can be variable; soil boring or engineering may be required for larger projects. The Building Department will flag insufficient footing depth at inspection.

Over-the-counter permits are available for small, straightforward projects — fences, sheds, minor repairs. Larger projects (decks, additions, structural work) typically go through plan review, which averages 2 to 3 weeks depending on completeness. The city's online portal is available, though many contractors and homeowners still file in-person at City Hall because the paper workflow is well-established and staff is responsive to face-to-face clarification.

Common rejection reasons in Detroit: missing site plans showing property lines and setbacks; insufficient detail on electrical or plumbing drawings; decks without frost-depth footings specified; work on rental properties filed by owner (tenant agreements or landlord status must be clear); and missing proof of ownership or authorization. Rejections are rare if you front-load the paperwork correctly.

Detroit also has strict enforcement on unpermitted work. Building violations can result in fines of $500 to $1,000+ per day of non-compliance. If you're buying a property with unpermitted additions, you'll need to either obtain a retroactive permit (with reinspection and often remediation) or remove the work. The city has been more aggressive on code enforcement in recent years, particularly for additions and electrical/plumbing upgrades in older neighborhoods.

Most common Detroit permit projects

These are the projects we see filed most often in Detroit. Each has its own thresholds, timelines, and local quirks. Click any project name to see the full breakdown for Detroit.

Decks

Detroit decks over 30 inches high or over 200 square feet need a permit. Frost depth is 42 inches — a critical dimension for footing design. Attached decks require flashing and ledger-board details per IRC R319; detached decks in rear yards under 200 sq ft sometimes qualify for exemption, but most do not. Plan to file before you buy materials.

Fences

Residential fences over 6 feet in height, all front-setback fences, and any fence enclosing a pool require a permit. Setback distance from the street varies by zoning — typically 25 to 35 feet for residential lots. Pool barriers (4 feet high, self-closing gates) always require a permit and inspection. Many homeowners miss the setback rule on corner lots.

Roof replacement

Most roof replacements require a permit if you're replacing more than 25 percent of the roof. Reroofing a full roof almost always requires a permit and inspections. Detroit's mix of older wood-frame and masonry buildings means inspectors will check for adequate ventilation and proper nailing patterns per code.

Electrical work

Most electrical work — adding circuits, upgrading panels, installing outlets or lighting in new spaces — requires a licensed electrician and an electrical subpermit. Owner-builder exemptions are limited; many projects require a licensed contractor. Plan review for complex electrical can add 1 to 2 weeks.

Basement finishing

Finished basements need a permit if you're adding walls, changing egress, or installing a bedroom. Egress windows are required for any new basement bedroom under Michigan code. The 42-inch frost depth affects basement design in older homes — sump pits and drainage may need review. Plan-check time can run 3 to 4 weeks for basement projects.

Do I need a building permit in Detroit, MI?