Do I need a permit in Farmington, MI?
Farmington sits in Oakland County, split between climate zones 5A and 6A, with a 42-inch frost depth that shapes how you build below grade. The City of Farmington Building Department enforces the Michigan Building Code (based on the 2015 IBC), which means most residential projects follow the standard rules — but frost depth, setback requirements, and wetland proximity can change what you actually need to do. Owner-builders are allowed for owner-occupied homes, but you still need a permit for structural work, electrical, plumbing, mechanical systems, and anything that adds square footage or changes the footprint. Small projects like interior paint, roofing, siding, and deck repair under 200 square feet sometimes slip into gray zones, but the safe move is a quick call to the Building Department before you start. Farmington is suburban enough that lots are smaller and setback rules bite harder than they do in rural areas, and the glacial-till soil means footing inspections matter — inspectors will want to see you've gone deep enough to avoid frost heave.
What's specific to Farmington permits
Farmington adopted the Michigan Building Code, which tracks the IBC closely but includes state-specific amendments around energy, accessibility, and frost protection. The 42-inch frost depth is the key number — any footing, foundation, or deck post must go below 42 inches to stay clear of frost heave. This is why a post-hole digger won't cut it for deck posts; you need either frost footings (concrete-filled holes below 42 inches) or posts on adjustable piers rated for frost conditions. Inspectors will ask to see footings before the concrete sets.
Farmington's zoning is residential-focused with tight setback rules in most neighborhoods. Corner lots have sight-triangle restrictions, which affect where you can build fences, decks, and additions. Lot lines and setbacks are the #1 reason permit applications get delayed or rejected — get a current survey or at minimum a plot plan from your deed before you file. If your property touches a wetland or drain easement, you'll need drainage approval from the city engineer, which adds 2-3 weeks.
The Building Department processes permits over-the-counter and by mail. Plan review typically takes 5-10 business days for routine residential work; complex additions or site-plan reviews can stretch to 3-4 weeks. There's an online permit portal (search 'Farmington MI building permit portal' to find the current link), but it's often easier to call first — staff can pre-screen your project and flag potential hold-ups before you file. Owner-builders are allowed, but you still need to pull permits yourself; the inspector won't sign off on work you didn't permit.
Electrical, plumbing, and HVAC permits are often required separately, even if they're part of a larger project. Many homeowners assume the general permit covers everything — it doesn't. A basement finish that includes a new circuit, a bathroom addition, or a boiler swap each need their own subpermit and inspection. Licensed contractors can sometimes fold these into their scope, but if you're doing any of the work yourself, file separately.
Final inspection is mandatory before you occupy any new space or consider a project 'done.' Inspectors check footings, framing, electrical rough-in, plumbing, HVAC, roof attachment, and grading. Don't assume passing one inspection means you're clear — the final covers everything. Late in the season (November through March), frost-heave risk is highest, and inspectors may require footing certificates or frost-protection documentation.
Most common Farmington permit projects
Farmington homeowners most often need permits for decks, basement finishes, additions, electrical work, and roof replacements. The Building Department handles all of these, but each has its own quirks — decks need footing certificates, basements need egress windows, additions need setback surveys, roof work sometimes doesn't. No project pages are live yet for Farmington, but the FAQs below cover the biggest questions.
Farmington Building Department contact
City of Farmington Building Department
Contact city hall at Farmington, MI (search 'Farmington MI building permit' or check the city website for the current office address and hours)
Search 'Farmington MI building permit phone' or call Farmington City Hall to confirm the Building Department direct line
Typically Monday-Friday, 8 AM - 5 PM (verify locally — hours may vary by season)
Online permit portal →
Michigan context for Farmington permits
Michigan adopted the 2015 International Building Code with state amendments, particularly around energy efficiency and frost-related footing depth. The state's frost-depth map sets 42 inches as the requirement for much of southern Michigan, including Farmington — this is harder than the IRC baseline of 36 inches in some regions. Michigan also requires a homeowner to pull permits themselves or hire a licensed contractor; you can't use a 'handyman exemption' to skip structural permits. The state allows owner-builders to pull permits for owner-occupied homes, but electrical work must be done by a licensed electrician or a homeowner with a one-time electrical homeowner exemption (which requires inspection). Plumbing and HVAC follow the same rule — licensed or exempted-owner only. Property-line surveys are recommended before any addition, fence, or deck that runs close to a boundary; Oakland County is detail-oriented about setbacks.
Common questions
Do I need a permit for a deck in Farmington?
Yes. Any deck over 30 inches high, any attached deck, and any deck over 200 square feet requires a permit. Even smaller detached decks usually need one in Farmington because of setback rules — most lots are sized such that you'll land in a setback zone without a survey. The permit requires frost footings below 42 inches and a final inspection. Expect to file a site plan showing where the deck sits relative to property lines, setbacks, and the house.
What about a basement finish — do I need a permit?
Yes. Any finished basement with drywall, flooring, or utilities (electrical, plumbing, HVAC) needs a permit. The Building Department will require egress windows (or a door to grade) in any bedroom and proof that existing foundation drains are intact. Electrical and plumbing subpermits are separate. If you're just painting concrete and adding shelves, you may not need a permit, but call first — the definition of 'finish' can be fuzzy.
How much does a permit cost in Farmington?
Farmington uses a valuation-based fee schedule. A typical deck permit runs $100–$250 depending on size and complexity. Basement finish permits range from $150–$400. Electrical subpermits are usually flat fees around $50–$100. Plan to add $50–$150 if you need a surveyor's site plan or a variance. Call the Building Department for a quote before you file — they can estimate based on your project scope.
Can I pull my own permit as a homeowner in Farmington?
Yes, for owner-occupied homes. Michigan allows owner-builders to pull permits and do the work themselves, except electrical work (which requires a licensed electrician or a one-time homeowner exemption). Plumbing and HVAC follow the same rule. You'll file the permit application yourself, pay the fee, and attend inspections. Licensed contractors often handle permitting as part of their bid, so ask when you get quotes.
What's the frost-depth requirement in Farmington?
Farmington's frost depth is 42 inches. Any foundation footing, deck post, fence post, or other below-grade structure must have its base below 42 inches to avoid frost heave. This applies year-round, but inspectors are most available May through September. If you dig in winter or early spring, frost-heave risk is real — the soil may already be partially frozen.
How long does plan review take in Farmington?
Routine residential permits (decks, small additions, electrical subpermits) usually clear plan review in 5–10 business days. More complex projects (large additions, basement finishes with structural changes, projects near wetlands or easements) can take 3–4 weeks. The Building Department can give you a better estimate if you call with details. Over-the-counter permits sometimes get approved the same day.
Do I need a survey for an addition or fence?
A current survey is the safest bet, but not always legally required. Farmington's zoning rules include setback limits that vary by zone — typically 25–35 feet from the front, 5–15 feet from the sides, and 20–30 feet from the rear. If your lot is tight or your project runs close to a line, a survey ($300–$800) is cheap insurance against a rejected application. At minimum, get a plot plan from your deed and mark the property corners with the seller's survey notes.
What happens if I skip the permit?
If the Building Department discovers unpermitted work, you'll be ordered to stop, file retroactively, and pay the permit fee plus penalties (often double the fee). Unpermitted work can also block a home sale — title insurance and lender inspections often catch it. More dangerously, unpermitted structural work voids your homeowners' insurance claim if something fails. The permit cost ($100–$400 for most projects) is far cheaper than the penalty or the risk.
Ready to file?
Call the City of Farmington Building Department to pre-screen your project. Have your address, lot size, and a rough description of what you're building ready. They'll tell you if you need a permit, what documents to file, and the estimated fee. Most projects clear in a call or two. If you need a surveyor or engineer, the Building Department can recommend local vendors who know Farmington's rules.