Do I need a permit in Farmington Hills, MI?
Farmington Hills sits in Oakland County straddling climate zones 5A and 6A, which means the frost depth varies: 42 inches in the southern part of the city. That detail matters for deck footings, foundation work, and anything that goes in the ground. The City of Farmington Hills Building Department enforces the 2015 Michigan Building Code and has adopted the national electrical, plumbing, and mechanical codes with state amendments. Most residential projects — decks, fences, additions, electrical work, plumbing, HVAC — require a permit before work begins. Owner-builders can pull permits for owner-occupied homes, which is common in Farmington Hills and saves the contractor-licensing requirement, but you still need to meet all code standards and pass all inspections. The city processes most residential permits through an online portal and over-the-counter at city hall. Plan review typically takes 1-2 weeks for routine projects; more complex work (additions, major electrical) can take 3-4 weeks. Fees run 1.5-2% of estimated project valuation for construction permits, flat fees for some mechanical work. Getting ahead of the permitting process saves money and headaches — code violations caught during construction cost far more to fix than the permit would have cost upfront.
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What's specific to Farmington Hills permits
Farmington Hills adopted the 2015 Michigan Building Code, which tracks the 2015 IBC closely with state amendments. The most visible difference for homeowners: deck footings must bottom out below the frost line. In the southern portion of the city (roughly south of Nine Mile), that's 42 inches; check with the building department if your property is in the northern section, where it may be deeper. Undersized footings are the #1 reason deck permits get rejected in plan review — get the frost depth right before you submit.
The city does not allow unpermitted work. Inspectors routinely catch violations during routine sales inspections and when homeowners file addition permits — the city will flag unpermitted decks, electrical, plumbing, and finished basements as code violations, and you'll be forced to bring them into compliance or remove them. This costs more than permitting upfront. If you already completed unpermitted work, contact the building department before selling or filing for anything else; they may allow you to retroactively pull a permit and do a final inspection, or they may require removal.
Farmington Hills has an active online permit portal for initial application and document upload. You can file applications online, track the status, and upload plans. However, some projects still require an in-person visit to city hall for final sign-off, fee payment, or clarification during plan review. The portal is the fastest entry point — start there, then check your email for any requests from the plan reviewer. Most residential permits are processed by one or two reviewers, so once they flag a question, turnaround is usually quick.
Electrical permits in Farmington Hills are single-trade: you cannot combine electrical work under a general building permit. A licensed electrician must pull the electrical permit in most cases, even if the homeowner is doing the wiring — Farmington Hills requires a licensed electrician's signature on electrical work. The only exception is minor work like outlet replacement or light-fixture swap under a certain amperage. Call the building department and describe your specific work; they'll tell you if you need a licensed electrician or if you can self-perform.
Farmington Hills is part of Oakland County, which has no additional county permit layer — the city building department is your sole permitting authority. However, if your property backs to a drain easement, environmental wetland, or county right-of-way, the county road commission or drain commission may have jurisdiction over grading or drainage changes. This is rare for typical residential projects but comes up on larger lots or corner properties. Ask the building department during your initial inquiry if your address touches any county infrastructure.
Most common Farmington Hills permit projects
These projects make up the bulk of residential permits in Farmington Hills. Each has its own rules, fees, and inspection sequence — click through to get the local specs for your project.
Decks
Decks over 200 sq ft or over 30 inches above grade require a permit. Footings must go 42 inches deep in most of Farmington Hills (verify for your property). Most decks cost $150–$400 to permit and take 2-3 weeks from application to framing inspection.
Fences
Residential fences over 6 feet require a permit; privacy fences and side-yard fences over 4 feet also need permits. Pool barriers always require a permit regardless of height. Permit fees are typically $75–$150 and are processed quickly over-the-counter.
Electrical work
Most electrical work requires a separate electrical permit. Homeowners can self-perform minor work (outlet, light fixture) but larger projects usually need a licensed electrician. Electrical permits are $100–$300 and are inspected within 3-5 business days of request.
HVAC
Furnace and air-conditioning replacement require mechanical permits. Most HVAC swaps are flat-fee ($100–$200), quick-permit projects; new ductwork or major system changes cost more and take longer.
Room additions
Any room addition, garage expansion, or enclosed porch requires a full building permit. Plan review is mandatory and usually takes 2-4 weeks. Fees are 1.5-2% of estimated cost, typically $300–$1,500 depending on size.
Basement finishing
Basement egress windows, partition walls, and electrical rough-in for finished space require permits. Many homeowners skip this — don't. An unpermitted basement creates future problems with resale, insurance, and code enforcement.
Farmington Hills Building Department contact
City of Farmington Hills Building Department
Farmington Hills City Hall, 31555 Eleven Mile Rd, Farmington Hills, MI 48336
(248) 675-1600
Monday-Friday, 8:00 AM - 5:00 PM
Michigan context for Farmington Hills permits
Michigan adopted the 2015 International Building Code (IBC) with state amendments, which is the basis for the 2015 Michigan Building Code that Farmington Hills enforces. Key points: Michigan uses a 42-inch frost depth for most of the Lower Peninsula (consistent with Farmington Hills' south-side requirement), although northern Michigan goes deeper. Michigan allows owner-builders to pull permits for owner-occupied residential projects without a contractor license, but you must comply with all code requirements and pass all inspections. Electrical work has a hybrid rule — homeowners can do minor electrical on their own home, but most jurisdictions (including Farmington Hills) prefer licensed electrician sign-off for anything beyond outlet and light-fixture replacement. Plumbing and HVAC follow similar patterns. Michigan has no state-level residential permit database, so each municipality (like Farmington Hills) maintains its own records. If you're relocating from another state, note that Michigan's code is close to the national standard, but building practices vary by frost depth and soil type — Farmington Hills' glacial-till soil is stable for foundations but affects drainage design.
Common questions
Do I need a permit for a deck in Farmington Hills?
Yes, if the deck is over 200 square feet, elevated more than 30 inches above grade, or attached to the house. Deck footings must go 42 inches deep in most of Farmington Hills (verify for your exact property with the building department). The permit costs $150–$400, and plan review takes 2-3 weeks. Footings are inspected in the field before concrete is poured, and the framing inspection happens before decking is laid.
What's the difference between a deck permit and a patio permit in Farmington Hills?
A deck is an elevated structure attached to the house or standing on its own with footings that go below frost line. A patio is a ground-level platform at or below grade with no footings. Patios do not require a permit in Farmington Hills as long as they're at grade and not enclosed. The 30-inch height threshold is the line: if you're 30 inches or more above existing grade, you need a deck permit and footings. Below 30 inches, you may only need a permit if the deck is over 200 square feet or attached to the house.
Can I do electrical work myself in Farmington Hills, or do I need a licensed electrician?
Minor work — outlet replacement, light-fixture swap, ceiling-fan installation — can usually be done by the homeowner under a homeowner permit. Larger projects (new circuits, panel upgrades, sub-panel installation, hot-tub or EV-charger wiring) require a licensed electrician. Call the building department and describe your specific work; they'll tell you if you're in the clear or need a professional. Even if you can do the work, you still need an electrical permit and a final inspection.
How much does a permit cost in Farmington Hills?
Residential permit fees in Farmington Hills are typically 1.5-2% of the estimated project cost. A deck might run $150–$400 (flat or low percentage). An electrical permit is $100–$300. A full addition or remodel is usually $300–$1,500 depending on the scope. Mechanical permits (furnace, AC) are often flat fees ($100–$200). Check with the building department or the online portal for the exact fee table, which is updated periodically.
What happens if I do work without a permit in Farmington Hills?
Unpermitted work is a code violation. Inspectors catch it during resale inspections, when neighbors report it, or when you file a later permit. The city will require you to bring the work into compliance (which means hiring a contractor, paying for inspections, and sometimes removing and redoing the work) or remove it entirely. This costs far more than the original permit would have. If you've already done unpermitted work, contact the building department now about retroactive permitting. Some jurisdictions allow it; others do not. Either way, don't wait until you're selling.
How long does it take to get a permit in Farmington Hills?
Plan review for routine residential permits (deck, fence, basic electrical) takes 1-2 weeks. More complex projects (additions, full remodels, HVAC with ductwork changes) take 3-4 weeks. Some permits are over-the-counter (fence, simple mechanical) and can be issued same-day or next-day. After approval, you have a set time to begin work (usually 6-12 months) and to complete all inspections. The online portal shows your application status and any plan-reviewer comments in real time.
Do I need to hire a licensed contractor in Farmington Hills?
Not for owner-occupied residential work if you're the owner-builder. You can pull the permit yourself and do most of the work. However, electrical and plumbing work often requires a licensed contractor or licensed tradesperson — Farmington Hills typically requires a licensed electrician for electrical permits and a licensed plumber for plumbing permits. Call the building department and describe your project; they'll tell you which trades require a license. Even as an owner-builder, you must meet all code requirements and pass all inspections.
What's the frost depth in Farmington Hills, and why does it matter?
The frost depth in southern Farmington Hills is 42 inches. In the northern part of the city (near the Oakland County border), it may be deeper. Frost depth is the deepest point where soil freezes in winter. Any structural footing (deck post, fence post, foundation, pier) must go below the frost line to avoid frost heave, where freezing and thawing cycles push the footing up and destabilize the structure. If your deck footings only go 24 inches deep and the frost line is 42 inches, your deck will shift and crack. This is why the building department is strict about footing depth — it's a failure mechanism, not a technicality. Check with the building department about your specific address if you're near the city boundary.
Can I use the online portal to file all my permits in Farmington Hills?
Most residential permits can be initiated online through the city's permit portal. You upload plans, photos, and supporting documents. However, some permits still require an in-person visit to city hall for final sign-off or fee payment. The portal gives you the application status and any plan-reviewer requests in real time, which speeds up the back-and-forth. Check the city's website for the portal link and any instructions on which projects are fully online vs which require a visit.
Ready to find out if your project needs a permit?
Start by clicking your project type above, which will walk you through Farmington Hills' specific rules, fees, and timeline. Or if you're not sure which category your project falls into, call the City of Farmington Hills Building Department at (248) 675-1600. A quick phone call — 2-3 minutes — answers 90% of homeowners' questions upfront and saves frustration down the road. Have a rough description of what you're doing, where it's located on your property, and the size ready, and the inspector will tell you whether you need a permit, what it costs, and what inspection sequence to expect.
More Michigan towns
Towns near Farmington Hills in the alphabet where we file your permit for you: Berkley, Brighton, Cooper Charter Township, Detroit, Gladstone, Hartford, Holland, Ishpeming.