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.

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.