Trenton, Michigan Building Permit Guide

In the City of Trenton, the Building Department at City Hall, 2800 Third Street (734-675-8251), issues every construction permit, from new houses and additions to electrical, plumbing, heating and sewer work, and also handles zoning permits for fences, sheds, driveways and patios. Jim LaPalm is the Building Official. Homeowners and contractors can file through BS&A Online or on paper; trade permits start at a $75 base fee, and the department quotes the building permit fee once the application is approved.

What requires a building permit in Trenton?

The city’s permits page states the core rule plainly: you need a building permit to repair, construct, alter, demolish or change a building or structure, or to have someone else do that work. Its project list then spells out what that means for the most common jobs.

The two documents overlap on small outbuildings: the permits page says sheds need a building permit, while the building and zoning application (revised March 2022) files accessory structures of 200 square feet or less under its zoning-permit box. Describe the shed’s size on the application and the department will decide which permit applies.

What Trenton decides and what the state holds

The Bureau of Construction Codes’ Statewide Jurisdiction List (revised November 6, 2026) marks Trenton as enforcing the building, electrical, mechanical and plumbing codes itself, and Wayne County has no county construction program at all. The technical rules come from the state code. The city adds its own layers: zoning under Chapter 110 of the Code of Ordinances, site plan review, fees, sewer and right-of-way standards, inspection of homes before sale and registration and inspection of every rental dwelling unit.

Trenton building department: who handles permitting

All construction permits for property inside the City of Trenton come from its Building Department, which also enforces local codes, inspects one- and two-family homes before resale, inspects existing commercial buildings for rental occupancy and registers rental housing. Site development plans, lot splits and combinations, rezoning requests and appeals to the Zoning Board of Appeals and Adjustments all start at the same counter.

Trenton is a city, so its limits are the whole service area; other Wayne County units such as Riverview, Woodhaven, Grosse Ile Township and Brownstown Township each enforce the codes themselves under the same state list.

Trenton permit types

The department posts one combined building and zoning application plus separate electrical, plumbing, mechanical, sewer, swimming pool and sign applications, a soil erosion application, a site plan permit application (with a utilities version), the site plan review packet, the inspection-upon-transfer request, a commercial certificate of occupancy request and a vacant property registration form.

Residential permits

• Building and zoning application. Every applicant completes sections on the project, the property, the owner, any architect or engineer and the contractor (license number and expiry, federal employer ID and workers’ compensation carrier or the reason for an exemption), then ticks the type of improvement: new building, addition, alteration, repair, demolition, foundation only, relocation, premanufactured unit or special inspection.
• Estimated cost. The figure you enter must include all building, electrical, plumbing and mechanical work, not just the carpentry.
• Driveway approaches. An approach in the public right-of-way must be concrete at least 6 inches deep, with expansion material between the public sidewalk and the curb; a new or widened approach also needs Engineering Department approval and a separate permit for the street cut.
• Pools. New pools and most major repairs need a pool permit and a final inspection; the electrical chart prices an above-ground pool at $30 and a below-ground pool at $50, both with a rough inspection.

Building or remodeling a home here? Alliance handles residential permit expediting, so the crew isn't waiting on the counter.

Commercial permits

Commercial work uses the same building and trade forms, and the trade charts carry separate commercial rates (for example a $100 commercial electrical starter permit and per-circuit pricing above 25 circuits). New development, redevelopment and the reuse of a vacant building go through Planning Commission site plan review first, and a business may not occupy a property until the city issues a zoning certificate of occupancy on its request form, which records the intended use, construction type and the parking the zoning ordinance requires.

For tenant improvements and new commercial builds, Alliance handles commercial permit applications through issuance. More on this: commercial building permits explained.

What comes before the building permit

• Site plan review. File a letter of transmittal, the application and seven copies of the site plan with the Building Department; after the Building, Engineering, Fire, Police and Public Services departments sign off, submit ten corrected copies. The city mails notice to owners within 300 feet at least 15 days before the hearing, and an approval lasts one year, with one-year extensions if you ask at least 30 days before it expires.
• Zoning Board of Appeals and Adjustments. Variance requests start at the Building Department.
• Soil erosion. Trenton is one of eight Wayne County cities that issue their own soil erosion and sedimentation control permits; the application goes to the city’s Engineering & Building Department with three full sets of plans.
• County right-of-way. Work in a Wayne County road right-of-way, on county property or in a county drain easement needs a construction permit from the county’s Department of Public Services.

Trenton permit costs and fees

For building permits the city does not post a schedule: its permits page says costs vary with the scope and type of work and that the department gives you the fee once the application is approved. Call 734-675-8251 for a figure before you budget. The trade and sewer applications, all revised in February 2025, do print their fee charts, and you total the items yourself on the form.

Worked examples from the charts: upgrading a house to a 200-amp service is the $75 base fee plus $30, or $105; replacing a furnace with its ductwork and gas piping is $75 plus $75, or $150, and the heating line is marked as needing a rough inspection, which the chart prices at $50 more. A permit that goes 180 days without a requested inspection is closed, and closed permits are not refunded.

Trade permits and who may pull them

Electrical, plumbing, mechanical and sewer permits are all issued by the Building Department, and every one ends with a city final inspection. Each trade form carries the same contractor block as the building application, and each repeats the state warning that conspiring to get around Michigan’s licensing rules for residential work carries civil fines under MCL 125.1523a.

• Electrical. Required for all electrical work; a starter permit ($75 residential, $100 commercial) lets work begin when the full scope is not yet known.
• Plumbing. Required for plumbing work, priced per fixture, drain, stack, backflow device and water line size.
• Mechanical. Required for most mechanical work; residential heating systems, bath and kitchen exhaust and ductwork are flagged for a rough inspection.
• Sewer. When the lead at the house is replaced, it must be 6-inch pipe with a 6-inch cleanout, and the contractor must replace any city sidewalk, street, curb or approach damaged by the work.
• Homeowners and contractors. BS&A Online has a homeowner application and a contractor application; the forms ask for the contractor’s license number and expiry date, so have the state license details ready when a contractor files.

How to apply for a Trenton building permit

Review, corrections and what causes delay

Construction documents must be clear enough for the Building Official to see the location, nature and extent of the work. Projects that need site plan approval wait for department reviews, a mailed public notice and a Planning Commission meeting, which meets twice a month. Driveway approaches that are new or widened stall without the Engineering Department’s separate street-cut permit, and an incomplete contractor block or missing license number holds up issuance.

Inspections and certificates in Trenton

The building application lists the inspections the department may require for a job: footing, base or forms, underlayment and ice barrier for roofs, rough, insulation, drywall and final. Trade permits add rough inspections where the chart says so and always a final. Request inspections through the Building Department at 734-675-8251; keep inspections moving, because a permit with no inspection requested within 180 days of issue or of the last inspection is closed.

Two city certificates go beyond new construction. Before a one- or two-family home is sold, the department inspects it under the inspection-upon-transfer program and issues a Certificate of Review only when the house meets the minimum standards for transfer. Those inspections run Monday, Wednesday and Friday between 9:00 a.m. and 1:00 p.m., the electricity must be on, the report goes out within two business days, and the seller must supply a furnace heat exchanger test by an independent mechanical contractor before a buyer takes on a signed housing agreement. For commercial space, a zoning certificate of occupancy is needed before anyone may use the property.

Michigan building code in Trenton

FEMA’s Community Status Book lists the City of Trenton (community 260244) as a participating National Flood Insurance Program community with a current map dated October 21, 2021. The city’s own flood map page still describes FEMA maps effective February 2, 2012, so check the parcel on the current FEMA map before relying on the older page.

Michigan enforces one statewide construction code under the Stille-DeRossett-Hale Single State Construction Code Act (1972 PA 230); local units cannot amend it, and enforcement sits with the city, village or township, a county program or the state Bureau of Construction Codes, sometimes split by trade. Michigan rules

Trenton permit search and official resources

Permit applications and payments run through BS&A Online. For copies of permits, plans or inspection reports, file a Freedom of Information Act request with the City Clerk’s Office at 2800 Third Street (734-675-8600); the city answers within five business days and may take ten more, and asks for a deposit of half the estimate when the fee will exceed $50. Police records go to the Police Department instead.

• Trenton Building Department
• Trenton permits page and project list
• BS&A Online for the City of Trenton (homeowner and contractor applications)
• Building and zoning permit application
• Electrical permit application and fee chart
• Plumbing permit application and fee chart
• Mechanical permit application and fee chart
• Sewer permit application and fee chart
• Soil erosion and sedimentation control permit application
• Planning Commission site plan review application
• Inspection upon transfer (sale of home) application
• Commercial certificate of occupancy request
• Trenton flood insurance rate map page
• Trenton FOIA information
• Trenton FOIA request form
• Wayne County soil erosion FAQs (2026)
• Wayne County construction permits
• Bureau of Construction Codes Statewide Jurisdiction List
• FEMA Community Status Book, Michigan

Trenton building permit FAQs

How much is a building permit in Trenton?

The city posts no building fee schedule; the Building Department quotes the fee after it approves the application. Trade permits start at a $75 base fee.

Do I need a permit for a fence or a patio?

Yes. Fences up to 6 feet, patios, service walks and driveways take a zoning permit with a site plan.

Does a shed need a permit in Trenton?

Yes. The permits page requires a building permit for sheds, garages and pole buildings, and the application handles accessory structures up to 200 square feet as zoning permits.

Can I apply online?

Yes. BS&A Online has separate homeowner and contractor applications, and paper forms are accepted at City Hall.

What happens when I sell my house in Trenton?

The city inspects one- and two-family homes before transfer and issues a Certificate of Review; the seller also supplies a furnace heat exchanger test.

Who issues soil erosion permits in Trenton?

The city itself, through its Engineering & Building Department, not Wayne County.

How long is a permit good for?

It stays valid while inspections continue; with no inspection for 180 days it is closed and not refunded.

When does the Planning Commission meet?

On the second and fourth Wednesday of each month at 7:00 p.m. at City Hall.

Simplify Trenton permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Michigan. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Trenton permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.