Do I need a permit for a deck under 200 square feet?

Not always. Kentwood exempts decks under 200 square feet if they sit on the ground (no posts below grade) and are under 30 inches high. If your deck is elevated on posts, it needs footings below 42 inches — and once you're digging footings, most jurisdictions require a permit because you're affecting drainage and frost-heave risk. Check with the building department before you design; a 199-square-foot deck with footings may still need a permit. It's a five-minute phone call and saves weeks of back-and-forth.

How deep do footings need to go in Kentwood?

Kentwood's frost depth is 42 inches. The Michigan Building Code requires footings to extend below the frost line to undisturbed soil, so your footing holes must bottom out at 42 inches or deeper. The IRC default is 36 inches, but Kentwood is colder and gets more freeze-thaw cycles, so Michigan adds 6 inches. Many homeowners find this surprising — they dig 36 inches, and the inspector flags it. Measure down from finished grade, not from the surface of mulch or leaves. If your lot is sloped, the frost depth runs from the highest finished grade on the property.

Can I do electrical work myself on a Kentwood owner-build permit?

No. Michigan law does not allow homeowners to pull electrical permits, even on owner-occupied properties. Any electrical work — adding a circuit, upgrading a panel, installing a hot tub, running outdoor lighting, or solar wiring — must be done by a licensed Michigan electrician. You can pull a general owner-builder permit for the structure (framing, roofing, siding), but the electrician will file a separate electrical subpermit. This rule is state-level and applies citywide, so there's no workaround.

How much do Kentwood building permits cost?

Kentwood's permit fee structure is typically based on project valuation, not a flat fee. Most residential projects run 1 to 2 percent of the estimated project cost. A $10,000 deck might cost $150–$200 in permit fees; a $50,000 addition might run $500–$1,000. Some cities charge a flat over-the-counter fee for routine projects like fences ($50–$100) and sheds ($75–$150). Call the building department with your project scope to get an exact quote; they'll calculate the fee once they see your plans.

How long does it take to get a Kentwood permit approved?

Routine projects (decks, fences, sheds under 200 square feet) typically get approved within 5 to 10 business days. Larger projects with multiple trades (additions, electrical, plumbing) take 3 to 4 weeks. If the inspector has questions or finds a code conflict, you'll get a marked plan with corrections and a request to resubmit — expect another week. The fastest path is a clear, scale site plan with labeled dimensions and setbacks. Unclear or incomplete submittals slow everything down.

What happens if I build without a permit in Kentwood?

Kentwood has code enforcement staff who investigate complaints and conduct random inspections. If they find unpermitted work, you'll get a violation notice and an order to stop work. You'll then be required to file for a permit retroactively, which often includes a penalty fee and re-inspection of all the work you've already completed. More seriously, unpermitted work voids your one-year warranty protection — if the structure fails, you can't pursue a claim under Michigan's builder-warranty law. You also can't get a certificate of occupancy or sell the property without disclosure of unpermitted work. Most buyers will require you to bring the work up to code before closing, which costs more and takes longer than getting a permit upfront.

Do I need a professional engineer or architect to submit plans for a deck or shed?

No. Kentwood allows homeowner-drawn or contractor-drawn plans for routine residential projects under 200 square feet. The plan must be to scale, show property dimensions, the proposed structure's footprint, setback distances, and (for decks) footing locations and depths. You don't need a stamp from a licensed engineer. For larger projects like room additions, the building department may require engineer or architect stamp if the scope involves structural changes or the addition is over a certain square footage. Call ahead with your scope to find out whether a professional plan is required.

Does Kentwood allow owner-builder permits?

Yes, for owner-occupied residential projects. You can file as the owner-builder and do the structural and finish work yourself. However, you cannot pull electrical, plumbing, or HVAC permits — licensed Michigan contractors must file those subpermits. Many owner-builders frame the structure, then bring in licensed subs for mechanical and electrical. Verify with the building department that your specific scope qualifies for owner-builder status.

Building Permits in Kentwood, MI (2026)

Do I need a permit in Kentwood, MI?

Kentwood, like all Michigan municipalities, enforces the Michigan Building Code (which adopts the IBC with state amendments). The City of Kentwood Building Department handles residential permits for the city's roughly 50,000 residents in Kent County. Most homeowners hit the same question: is my project big enough or risky enough to need a permit? The answer hinges on three things — what you're building, where it sits on your lot, and whether it touches electrical, plumbing, structural, or HVAC systems. A deck under 200 square feet with no electrical may be exempt. An attached deck over 30 inches high, or any deck with a hot tub, requires a permit. A fence in a corner-lot sight triangle needs approval. A finished basement with new electrical circuits requires a permit; a new drywall layer over existing wiring does not. This guide walks through what Kentwood requires, what you file, what it costs, and what the building department actually looks for when they inspect your work.

What's specific to Kentwood permits

Kentwood sits on the border between climate zones 5A (south) and 6A (north), and frost depth runs 42 inches across most of the city. This matters for decks, sheds, and any structure needing footings. Your footings must go below 42 inches to reach undisturbed soil — below the frost line, where soil doesn't heave and shift with freeze-thaw cycles. The IRC default is 36 inches; Michigan adds 6 inches because of the local climate. If you're building in the sandy northern part of Kentwood, you'll also hit glacial-till soil that drains differently than clay-heavy areas. The building inspector will ask about soil conditions at footing inspection. Many homeowners dig to 36 inches, stop, and learn too late that the city won't pass the inspection. Start your footing dig at 48 inches and backfill to 42 to be safe.

Kentwood uses the Michigan Building Code, which Michigan adopted and updated in 2015. The state has not yet adopted the 2021 or 2024 editions, so Kentwood still enforces the 2015 cycle. This affects how the city interprets deck guardrails, electrical service upgrades, and HVAC clearances. If you're hiring a contractor licensed in a neighboring state or consulting online forums, make sure you're looking at Michigan code, not a neighboring state's rules. A guardrail height that's legal in Indiana may not be legal in Kentwood.

The City of Kentwood Building Department processes permits at City Hall. As of this writing, Kentwood has an online permit portal for submitting and tracking applications, though the portal's exact URL and functionality change periodically. Call the building department directly to confirm the portal's current web address and whether your project qualifies for online filing. Walk-in appointments are available during business hours, typically Monday through Friday, 8 AM to 5 PM. Plan-check turnaround varies: routine residential projects (decks, fences, sheds under 200 square feet) often get approved within 5 to 10 business days. Larger additions or multi-trade projects (electrical, plumbing, HVAC) may take 3 to 4 weeks. If the inspector has questions or finds code conflicts, you'll get a red-marked plan with specific corrections — expect another week to resubmit and re-review.

Kentwood requires a site plan for most residential permits. The site plan must show your lot's dimensions, the location of the existing house, the proposed structure, setback distances from property lines, and lot coverage if there's a limit in your zone. You don't need a professional survey, but you do need to label distances clearly. Hand-drawn plans are fine as long as they're to scale and legible. The #1 reason permits get bounced is a missing or unclear site plan. Many homeowners skip this step and submit a contractor's sketch — then wait an extra week for a resubmission. Draw it yourself or ask your contractor to provide one before you file.

Owner-builder permits are allowed for owner-occupied residential projects in Kentwood. If you're doing the work yourself (not hiring a contractor), you can file directly as the owner-builder. However, any trade work — electrical, plumbing, HVAC, gas — typically requires a licensed Michigan contractor or a licensed sub-permittee, even if you're owner-building the structure. Some homeowners pull an owner-builder permit for framing, then hire a licensed electrician for the subpermit on wiring. Verify with the building department whether your specific scope qualifies for full owner-builder status or mixed licensing.

Most common Kentwood permit projects

These five projects account for the bulk of residential permits filed in Kentwood. Each has its own threshold, common rejection reasons, and inspection sequence. Click any project to dive into local specifics.

Decks

Attached decks over 30 inches high or any deck over 200 square feet requires a permit in Kentwood. Frost depth is 42 inches, so footings must bottom out below grade. Most decks get plan-check approval within 5 business days; footing and framing inspections run sequentially.

Fences

Fences over 6 feet in rear yards and all fences in corner-lot sight triangles require a permit. No site survey needed; a sketch showing property lines and fence location is sufficient. Permits typically process over-the-counter within 1 to 3 days.

Electrical work

New circuits, panel upgrades, hot-tub wiring, and solar installations require an electrical permit. Homeowners cannot pull electrical permits; a licensed Michigan electrician must file the subpermit. Inspections happen after rough-in and again after final connections.

Room additions

All room additions, whether attached or detached, require a permit. You'll need foundation plans, electrical layouts, and proof of setback compliance. These are multi-trade projects; expect 3 to 4 weeks for plan review.

Do I need a building permit in Kentwood, MI?