Do I need a permit in Ann Arbor, MI?
Ann Arbor uses the 2015 International Building Code with Michigan amendments, which means most residential projects — decks, additions, roof work, electrical upgrades, fence repairs — do require a permit. The city's Building Department processes permits through their online portal, and they're generally thorough: plan reviews average 2-3 weeks for routine residential work, and inspections are required before cover-up (drywall, concrete pour, etc.). The city's frost depth of 42 inches — deeper than the IRC standard of 36 inches in Climate Zone 5A — affects deck footings and foundation work; footing inspections tend to happen May through September, when the ground is accessible. Ann Arbor also has stronger-than-average tree-preservation rules and wetland sensitivity, which can trigger additional environmental reviews for larger projects. The permit fee structure is based on project valuation at roughly 1.5% of the estimated cost, with a $75 minimum for most residential permits. Owner-builders can pull permits on their own occupied home, but licensed contractors must pull permits for any work they're hired to do — and the city enforces this actively.
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What's specific to Ann Arbor permits
Ann Arbor's online permit portal is live and functional — you can file, pay, and track inspections entirely online for most residential projects. This speeds things up compared to paper filing. However, the portal's backend sometimes requires clarification calls before the system accepts your application; the Building Department's phone line can get backed up on Tuesdays and Wednesdays, so call early in the week if you're stuck.
The city enforces owner-builder restrictions strictly. If you hire a contractor, the contractor must pull the permit — not you. The city cross-checks contractor licensing through LARA (Michigan's licensing board), and they'll flag any work pulled under the homeowner's name that clearly exceeds owner-builder scope. This doesn't stop homeowners from doing the work themselves after permit issuance; it just means the permit application must be honest about who's doing the work.
Ann Arbor's wetland and tree-preservation rules are more aggressive than many Michigan cities. If your property sits within 500 feet of a wetland or you're removing a tree over 20 inches in diameter, you may need environmental review on top of your building permit. This adds 2-4 weeks to the timeline and sometimes requires a site-plan review. Check the city's environmental-review maps before you file — they're available online and save surprises later.
Footing inspections in Ann Arbor are mandatory and must happen before you pour concrete or backfill. The city's frost depth of 42 inches (versus the IRC's 36-inch standard) is non-negotiable; footing bottoms must clear 42 inches minimum. This means deck footings, foundation trenches, and utility trenches all go deeper than you might expect. Inspectors are strict about this because of Michigan's freeze-thaw cycle.
The Building Department is responsive to email but prefers phone contact for permit-status questions. In-person visits to the counter are possible but only during specific hours (verify current hours locally). The department processes over-the-counter permits for small projects like fence repairs and shed additions if your plans are simple and complete; expect to wait 15-30 minutes at the counter.
Most common Ann Arbor permit projects
These projects account for the majority of residential permits the city issues. All require permits and inspections; none are exempt in Ann Arbor.
Decks
Any attached deck or patio requires a permit. Ann Arbor's 42-inch frost depth drives footing depth; shallow footings are the #1 reason for inspection failure. Detached decks under 200 square feet with no roof or railing may qualify for expedited review in some cases.
Fences
Fences over 4 feet in side or rear yards and any fence in front-yard setbacks require permits. Corner-lot sight triangles are strictly enforced. Masonry walls over 3 feet also need permits. Permit fees run $75–$150 depending on linear footage.
Roof replacement
Full roof replacement requires a permit and inspection. Minor repairs (under 25% of roof area) may be exempt if you're not changing the structural assembly, but the safest move is to call the department before you start. The city requires a final inspection before occupancy.
Electrical work
All electrical work beyond simple fixture replacement requires a permit and inspection. Panel upgrades, new circuits, and generator installations need licensed electrician involvement. The city enforces NEC 2020 with Michigan amendments; inspectors are strict about ground-fault protection and arc-flash labeling.
Room additions
Any addition or finished basement conversion needs a permit, site plan, and structural review. Plan review averages 3 weeks. The department requires electrical and mechanical permits as separate subpermits if you're adding HVAC or circuits.
Ann Arbor Building Department contact
City of Ann Arbor Building Department
Ann Arbor City Hall, 301 E Huron St, Ann Arbor, MI 48104
Monday-Friday, 8 AM - 5 PM
For the phone number and current details, see the city's official website.
Michigan context for Ann Arbor permits
Michigan operates under the 2015 International Building Code with state-specific amendments. Notably, Michigan's residential code emphasizes freeze-thaw protection — the 42-inch frost depth requirement is statewide for Climate Zones 5A and 6A, which cover Ann Arbor. Contractors in Michigan must be licensed through LARA (the state's Licensing and Regulatory Affairs division); the city cross-checks licensing at permit issuance. Owner-builders can pull permits on their own occupied home without a license, but the work must be owner-performed and the property must be owner-occupied. Michigan also requires radon testing as a disclosure item for new construction and substantial renovations, though this is typically a post-occupancy matter rather than a permit trigger. Electrical work must comply with NEC 2020 with Michigan amendments; arc-flash labeling, ground-fault protection, and bonding rules are strictly enforced. The state allows homeowners to do electrical work on their own home with owner-builder exemptions, but many municipalities (including Ann Arbor) require a licensed electrician for panel work and permit applications regardless. Always confirm local practice with the Building Department.
Common questions
Can I pull a permit for a contractor's work, or does the contractor have to pull it?
The contractor must pull the permit. Michigan law and Ann Arbor's enforcement practice require the permit applicant to be the entity performing the work (or the licensed contractor supervising it). If you're hiring someone, they pull the permit in their name and license. If you're doing the work yourself on your own home, you can pull an owner-builder permit. The city cross-checks contractor licensing at issuance, so misrepresenting who's doing the work will cause a rejection.
What's the typical permit fee for a residential project in Ann Arbor?
Fees are typically 1.5% of estimated project valuation, with a $75 minimum. A $10,000 deck would run roughly $150. A $50,000 addition would run $750. Electrical subpermits are flat-fee ($100–$200 depending on scope). The online portal calculates fees automatically after you enter your project details; there are no surprise add-ons beyond what the portal shows.
How long does plan review take in Ann Arbor?
Routine residential permits (decks, fences, small sheds) process in 1-2 weeks if your application is complete on first submission. Larger projects (additions, room conversions) average 2-3 weeks for initial plan review. Environmental review (wetlands, tree preservation) adds 2-4 weeks. The portal shows your review status in real time; if the department needs clarification, they'll email or call. Resubmissions restart the clock, so getting the application right the first time matters.
Do I need a permit to replace my roof?
Full roof replacement requires a permit and final inspection. Like-for-like reroofing (same material, same pitch, same fastening method) may be exempt if you're not changing the structural system, but the safest move is a 5-minute phone call to the Building Department before you start. Even if you think you're exempt, the city may require the permit once word gets out. Call first, file second.
What's the frost-depth requirement for deck footings in Ann Arbor?
Ann Arbor's frost depth is 42 inches — that's where the bottom of any footing must be, no exceptions. This is 6 inches deeper than the IRC default for Climate Zone 5A, and it reflects Michigan's aggressive freeze-thaw cycles. Inspectors will dig if they suspect a footing is shallow. The best practice is to mark footing locations on your site plan and schedule an inspection before you pour.
Can I do electrical work myself on my own home?
Michigan allows owner-builders to do electrical work on their own occupied home without a license, but Ann Arbor enforces stricter rules in practice: panel upgrades, service-entrance work, and generator installations typically require a licensed electrician to pull the permit and do the work. Fixture replacement and simple circuit additions may be owner-performed if you pull an owner-builder permit and pass inspection. Call the Building Department to confirm scope before you start — electrical is the one trade where the city's enforcement is inconsistent if you're not clear upfront.
Are there any environmental reviews that might delay my permit?
Yes. If your property is within 500 feet of a wetland or you're removing a tree over 20 inches in diameter, the city will flag your permit for environmental review. This adds 2-4 weeks to the timeline. Check the city's online environmental maps before you file — they show wetland buffers and tree-preservation zones. If your project touches either, disclose it upfront in the permit application; trying to hide it will cause a rejection and restart the review process.
How do I file a permit in Ann Arbor?
The city prefers online filing through their permit portal. Create an account, upload your plans and supporting documents (site plan, floor plan, elevation, electrical or mechanical drawings as needed), enter project details and valuation, and pay the fee. The portal accepts credit card and e-check. You can also file in person at City Hall during business hours, though online is faster. The portal guides you through which documents are required for your project type.
What happens if I skip the permit and do the work anyway?
Ann Arbor has active code enforcement. Unpermitted work discovered during title searches, sales inspections, or neighbor complaints leads to stop-work orders and fines. Fixing unpermitted work retroactively costs more than getting the permit upfront — you'll pay the original permit fee plus penalties, plus the cost of correcting any code violations uncovered during retroactive inspection. Resale is also complicated; many title companies flag unpermitted work, and some lenders won't close on a home with major unpermitted improvements. File the permit first.
Ready to file your Ann Arbor permit?
Start by identifying your project type above and clicking through to the detailed guide. Each guide includes a local checklist, specific form requirements for Ann Arbor, common rejection reasons, and timeline expectations. If you're unsure whether you need a permit, call the Building Department at the number above — a 5-minute conversation saves weeks of regret. If you're ready to file, log into the Ann Arbor permit portal and upload your documents. Plan reviews start when your application is complete; incomplete submissions restart the clock when you resubmit.
More Michigan towns
Towns near Ann Arbor in the alphabet where we file your permit for you: Berkley, Brighton, Cooper Charter Township, Detroit, Gladstone, Hartford, Holland, Ishpeming.