How to Get a Deck / Patio Permit in Ann Arbor, MI (2026 Guide)
Everything you need to know about deck / patio permits in Ann Arbor, MI — local requirements, fees, timelines, and how to apply.
Last updated: April 4, 2026
Check your specific deck / patio project
Get an instant, personalized answer for your exact project details in Ann Arbor.
Free Permit Lookup →Do You Need a Deck / Patio Permit in Ann Arbor?
Based on Ann Arbor's local building codes, you'll need a permit when:
Attached decks require a building permit even if under 30 inches, as the ledger board attachment affects the dwelling structure.
Source: City of Ann Arbor Code / 2015 MI Residential Code
Decks more than 30 inches above grade require a building permit with plans showing footings, structural connections, and guardrails.
Source: City of Ann Arbor Code / 2015 MI Residential Code
Covered decks or those over 300 sq ft require a building permit and may trigger additional zoning review.
Source: City of Ann Arbor Code / 2015 MI Residential Code
These deck / patio projects are typically exempt in Ann Arbor:
Freestanding decks not more than 30 inches above grade are exempt from a building permit per IRC R105.2.
Source: City of Ann Arbor Code / 2015 MI Residential Code
Permit Fees in Ann Arbor
Based on local Ann Arbor permit data, fees for deck / patio projects typically range:
Here's how fees break down by project scope nationally:
| Project Scope | Typical Permit Fee |
|---|---|
| Small deck (under 200 sq ft) | $75 – $250 |
| Medium deck (200–500 sq ft) | $200 – $500 |
| Large or multi-level deck (500+ sq ft) | $400 – $1,000+ |
| High-cost metros (SF, NYC, Seattle) | $500 – $1,500+ |
| Plan review fee (in addition to permit) | 50–65% of base permit fee |
| Re-inspection fee (per failed inspection) | $25 – $75 |
Fees are typically calculated based on estimated project value. Contact Building, Rental and Inspection Services for exact amounts.
How Long Does It Take?
In Ann Arbor, typical approval time for deck / patio permits is About 2 weeks.
More complex projects requiring structural review or variances may take longer. Simple projects may qualify for expedited or over-the-counter review in some cases.
How to Apply for a Deck / Patio Permit in Ann Arbor
- 1 Check requirements: Use our free lookup tool or contact Building, Rental and Inspection Services to confirm your project needs a permit.
- 2 Gather documents: Prepare your application, site plan, construction drawings, and any other required documents.
- 3 Submit online: Ann Arbor accepts applications online at Building, Rental and Inspection Services.
- 4 Pay fees: Pay the applicable permit fees ($100 – $600).
- 5 Wait for approval: Your application will be reviewed by Ann Arbor plan reviewers. Typical turnaround is About 2 weeks.
- 6 Begin work: Once approved, post your permit visibly at the job site before starting work.
- 7 Schedule inspections: Call Building, Rental and Inspection Services at (734) 794-6263 to schedule required inspections at each phase of the project.
Ann Arbor Building Department Contact
Required Documents for a Deck / Patio Permit in Ann Arbor
You'll typically need the following when applying for a deck / patio permit in Ann Arbor:
- Permit application form — Include property owner name and contact info, property address and parcel/tax ID number, contractor name and license number (if applicable), project description (e.g., 'New 12x16 attached composite deck with stairs and railing'), and estimated construction cost including materials and labor.
- Site plan (plot plan) — Must show property boundary lines with dimensions, all existing structures, the proposed deck location with dimensions, distances from the deck to all property lines (to verify setback compliance), easements, utility locations, a north arrow, and scale. If on septic, include well and septic system locations with required clearances.
- Construction drawings — Plan view (bird's-eye) with all dimensions, plus elevation/section views showing height above grade, footing depth, and all structural members. Include footing size and type, post sizes, beam sizes and spans, joist sizes and spacing, decking material and fastening pattern, and all hardware and connectors (joist hangers, post bases, lag screws).
- Ledger board attachment detail — Required if the deck attaches to the house. Must show the connection method (1/2-inch lag screws or through-bolts per IRC R507.9), flashing details to prevent water infiltration, and how the ledger attaches to the house's band joist — not just through the siding.
- Railing and stair details — Guard rail height (minimum 36 inches residential), baluster spacing (maximum 4 inches — a 4-inch sphere cannot pass through), stair riser height (maximum 7-3/4 inches), tread depth (minimum 10 inches), and handrail height on stairs (34–38 inches).
- Additional documents when applicable — Engineering calculations for unusual spans or heavy loads, manufacturer specs for composite decking or helical piers, HOA approval letter, historic district review approval, flood zone elevation certificate, or a property survey if setbacks are tight.
Requirements may vary. Contact Building, Rental and Inspection Services for the complete list of required documents.
Common Mistakes to Avoid in Ann Arbor
Starting construction before getting the permit
This is the most common and most costly mistake. Building departments can issue stop-work orders, fines (often 2–10x the original permit fee), and in serious cases, demolition orders. An after-the-fact permit — if the department even allows one — comes with penalty fees and requires inspections that may mean tearing out finished work.
Not checking setback requirements
Every property has setback lines — minimum distances structures must be from property lines. These are typically 5–10 feet for side yards and 10–25 feet for rear yards, but they vary by jurisdiction. Building over a setback line violates zoning, and the deck may need to be removed or modified. Check your local zoning map or call the building department before you design.
Assuming you don't need a permit
Many homeowners wrongly assume small or low decks are automatically exempt. But the IRC exemption requires ALL four conditions to be met: under 200 sq ft, under 30 inches above grade, not attached to the house, and not serving a required exit door. Miss even one, and you need a permit. Some cities don't offer any exemption at all.
Improper ledger board attachment
The ledger-to-house connection is the number-one structural failure point for decks. Using nails instead of lag screws or through-bolts, skipping flashing, or attaching through vinyl siding instead of directly to the band joist are all dangerous and code-violating mistakes. A failed ledger connection can cause the entire deck to collapse away from the house.
Not calling 811 before digging footings
Hitting a buried gas, electric, water, or cable line during footing excavation is dangerous and can be extremely expensive — you'll be liable for repair costs and potential fines. Call 811 at least 2–3 business days before digging. It's free, and it's required by law in every state.
Footings that don't reach the frost line
Footings must extend below the local frost line to prevent frost heave — the ground freezing and pushing the footing upward, cracking your deck structure. In northern states, the frost line can be 36–48 inches deep. Your building department can tell you the required frost depth for your area.
Using wrong fasteners with pressure-treated lumber
Modern pressure-treated lumber (ACQ and CA treatments) is highly corrosive to standard metal fasteners. You must use hot-dipped galvanized (G185 rating) or stainless steel hardware. Regular galvanized or zinc-plated fasteners will corrode and fail. Do not use aluminum flashing in contact with treated wood.
Skipping or mistiming inspections
Pouring concrete before the footing inspection, or installing decking before the framing inspection, means the inspector can't verify the hidden work. You may be required to remove finished materials — at your expense — so the inspector can see the structure underneath. Schedule each inspection before moving to the next construction phase.
Never closing out the permit
Failing to get your final inspection leaves an open permit on the property record. This creates real problems: it can complicate or block a home sale, affect your ability to refinance, and your homeowner's insurance may not cover claims related to the unpermitted structure. Always schedule the final inspection and get the permit closed.
Required Inspections in Ann Arbor
Most deck / patio projects in Ann Arbor require inspections at each construction stage:
Footing / Pier Inspection
When: After holes are dug but before concrete is poured
Hole locations match approved plans, hole dimensions (diameter and depth) meet specifications, depth is below the local frost line, holes are clean and free of loose dirt or standing water, rebar or post brackets are positioned correctly if required, and soil conditions are adequate.
Common failures: Holes not deep enough, wrong locations relative to plans, standing water or loose soil at the bottom of the hole.
Framing Inspection
When: After all structural framing is complete but before decking boards are installed — the inspector must be able to see all framing
Ledger board attachment (correct fasteners, proper spacing, flashing installed), post-to-footing connections with approved connectors, beam and joist sizes and spans match approved plans, all joist hangers installed with every nail hole filled, guard rail posts properly connected to framing, stair stringers installed, correct hardware for treated lumber, and lateral bracing for freestanding decks over 30 inches.
Common failures: Missing joist hanger nails (every hole must be filled), ledger not properly flashed, wrong fastener type for treated lumber, beam or joist spans exceeding IRC tables.
Final Inspection
When: After all work is complete — decking, railings, stairs, and trim
Guard rail height (minimum 36 inches), baluster spacing (maximum 4 inches — a 4-inch sphere cannot pass through), guard rail structural integrity (must resist 200 lb concentrated load), stair riser height (maximum 7-3/4 inches) and tread depth (minimum 10 inches) with uniform measurements, handrail height on stairs (34–38 inches) and graspability (1-1/4 to 2-inch diameter), landings at top and bottom of stairs, and overall completion matching the approved plans.
Common failures: Baluster spacing too wide, inconsistent stair riser heights (maximum 3/8-inch variation allowed), handrail not graspable, guard height short of the 36-inch minimum.
Schedule inspections with Building, Rental and Inspection Services at (734) 794-6263 at least 24–48 hours in advance.
Pro Tips for Deck / Patio Permits in Ann Arbor
- Call your building department before you design anything — a 10-minute conversation about setbacks, height limits, and their preferred submission format can save you weeks of rework and revision cycles.
- Ask specifically about over-the-counter permits. For simple decks that follow the department's prescriptive guide, many jurisdictions will review and issue the permit same-day at the counter — no waiting for plan review.
- If your department publishes a prescriptive deck construction guide (many do), design your deck to match it exactly. Plans that follow the guide sail through review because the reviewer can verify compliance quickly.
- Get a property survey if you have any uncertainty about where your property lines are. A $300–$500 survey is far cheaper than tearing down a deck that violates a setback requirement.
- Submit complete plans the first time. Incomplete submissions are the number-one cause of delays. Include every detail the checklist asks for — a missing flashing detail or unspecified footing depth will trigger a correction letter and add 1–2 weeks.
- Hand-drawn plans on graph paper are accepted by many departments for simple residential decks. They must be neat, legible, dimensioned, and to scale — but you don't necessarily need CAD software or a draftsman.
- Budget for the permit as part of your project cost. A $200–$500 permit fee is a small fraction of a $5,000–$25,000 deck build, and it protects your investment, your safety, and your home's resale value.
- Take photos at every construction stage — before pouring concrete, after framing, before covering anything. Photos protect you if there are disputes later and are valuable documentation when you sell the home.
- If hiring a contractor, verify they will pull the permit in their name. A legitimate contractor pulls permits as a matter of course. If a contractor asks you to pull the permit yourself, or suggests skipping it, that's a red flag about their licensing and insurance.
- Plan for inspection scheduling in your project timeline. Most departments need 24–48 hours' notice to schedule an inspection, and inspectors have limited daily availability. Build this buffer into your construction schedule so you're not sitting idle.
Frequently Asked Questions
Whether you need a permit depends on the size and scope of your deck / patio project. In Ann Arbor, some smaller projects are exempt while larger ones require a permit. Use our free lookup tool to check your specific situation.
Permit fees for deck / patio projects in Ann Arbor typically range from $100 – $600. Fees are usually based on the estimated project value.
Typical approval time in Ann Arbor is About 2 weeks. Complex projects requiring structural review may take longer.
In most cases, homeowners in Ann Arbor can pull permits and perform work on their own primary residence as an owner-builder. You're still responsible for meeting all code requirements and passing inspections.
Working without a required permit in Ann Arbor can result in fines, stop-work orders, required removal of completed work, and complications when selling your home.
Ready to check your deck / patio project in Ann Arbor?
Use our free lookup tool to get a personalized answer based on your specific project details.
Free Permit Lookup →Other Permit Guides for Ann Arbor, MI
Explore more permit guides for Ann Arbor:
Deck / Patio Permits in Nearby Cities
See deck / patio permit requirements in other Michigan cities:
See Detailed Deck / Patio Rules for Ann Arbor
View all local rules, exemptions, and fee details on the permit page.
Deck / Patio Permit Rules →