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Generator Installation Permit
Which office issues the permit for your address, what gets inspected, and what to ask before a standby generator goes in.
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A Generator Installation Permit is the paperwork that lets a standby generator, its transfer switch and its fuel line be installed and inspected the legal way. In Michigan it comes from the township or city building department that covers your address, not from the generator maker or the utility. This Generator Installation Permit guide explains who issues it, what each permit covers and what the inspector looks at.
Rules, forms and fees differ from one office to the next, so treat this page as a map, not the final word. Confirm current requirements for your address with your building department before work starts. For the whole job from site visit to startup, see our whole house generator installation overview.
Lectro's tip
Call your building department before you buy the generator. A ten-minute call can rule out a spot you can't use.
What usually needs a permit
A home standby generator and its automatic transfer switch
New wiring, breakers or panel work for the generator
Gas piping or a propane line to the generator pad
An inlet box and interlock for a portable generator
Before you call the office
Know whether you live in a city or a township
Have the generator model and kW size picked out
Sketch where the unit will sit on your lot
Ask which permits, drawings and inspections apply
Do You Need a Permit to Install a Generator?
For a home standby generator, yes. The job adds new electrical equipment, ties it into your panel and usually runs a fuel line. Michigan's electrical code requires a permit before conductors or equipment are added or changed, and a standby install does both.
Standby generators
A permanent unit on a pad with an automatic transfer switch needs at least an electrical permit. Most also need a mechanical or gas permit for the fuel piping.
Portable generators
A portable generator running a few cords to appliances is not a wired install. Adding an inlet box and an interlock or manual transfer switch to your panel is electrical work, and it generally needs a permit. Never backfeed a dryer outlet: it can put voltage on the utility lines and endanger line workers. Our generator transfer switch installation page covers the safe ways to connect.
Who Issues a Generator Permit in Michigan
The office that issues your permit is called the authority having jurisdiction. For most homes in Southeast Michigan, that is the city or township building department. In communities that do not run their own electrical inspection program, the state Bureau of Construction Codes handles the electrical permit.
Your mailing address does not settle it. A few examples from our area:
Belleville 48111: homes inside the City of Belleville go through the city's building department. Homes in Van Buren Township go through the township's building office, and parts of Sumpter Township share the same ZIP.
Ypsilanti: the City of Ypsilanti and Ypsilanti Township each issue their own permits.
Plymouth and Northville: the city and the township are separate municipalities with separate permit offices.
Your property tax bill names the municipality. If it is still unclear, call the township or city hall and give them the street address.
Electrical, Mechanical and Gas Permits
A standby install often touches two trades, and some offices split the paperwork between them.
Permit | What it usually covers | Who usually applies |
|---|---|---|
Electrical | Switch, wiring, breakers, grounding | A licensed electrical contractor |
Mechanical or gas | Gas line from meter or tank | A licensed mechanical or gas contractor |
Zoning or site review | Where the unit sits on the lot, in offices that ask for it | Often filed with the electrical or mechanical permit |
Some offices fold everything into one application. Others want a separate permit and inspection for each trade. Your gas utility may also need to check the meter, since a generator adds a large load. Our natural gas vs propane guide explains the fuel side in more detail.
Who Pulls the Permit: Contractor or Homeowner
Most generator permits are pulled by the licensed electrical contractor doing the work. The contractor's license is tied to the permit, and the contractor answers to the inspector for the result.
Michigan also lets a homeowner apply for electrical work on a single-family home they own and live in. Offices set their own conditions, and some ask the owner to sign an affidavit or show they understand the code. With a homeowner permit, you are responsible for code compliance and for booking the inspections.
We advise against a do-it-yourself generator tie-in. It means working in a live panel, sizing conductors and coordinating fuel. 3D Electric is licensed and insured, and your free written estimate lists the permit and inspection steps and who handles each one.
What the Building Department May Ask For
Small jobs may need little more than the application. Many offices want more for a standby generator. Common items include:
A plot plan or site sketch showing the generator, the house and the property lines
Spec sheets for the generator and the transfer switch
A one-line diagram and a load calculation, often for automatic transfer switches
Gas pipe and meter sizing for the generator's fuel demand
The manufacturer's installation instructions for your model
Westland, for example, publishes a generator requirements sheet that asks for most of these and lists its own placement and noise rules. That is one city's document, so read the current version from your own office rather than borrowing another town's rules.
Placement Rules and Clearances
Where the generator can sit is set by two sources: the manufacturer's installation manual for your model and the codes and ordinances your office enforces. When they differ, the stricter one wins.
What the rules protect
Engine exhaust, which contains carbon monoxide, kept away from windows, doors and vents
Air flow around the cabinet for cooling and service access
Distance from property lines, decks, fences and anything that burns
Noise at the neighbor's lot line, in towns with noise limits
Why we look before you buy
Gas meters, air conditioners, egress windows and narrow side yards can rule out the spot you had in mind. Picking the location first keeps the permit drawing honest and keeps the trench and conduit run short. The whole house generator cost guide shows how placement changes the price.
Generator Inspections: Rough and Final
Most offices inspect the electrical work at least twice. The rough inspection happens while trenches and wiring are still open. The final happens once the system is complete. Gas work may get its own pressure test and final.
What inspectors commonly check
Transfer switch type, amp rating and labels
Wire size, conduit, burial depth and breaker ratings
Grounding and bonding at the generator and the switch
Generator placement against the manual and local rules
The fuel connection, where the same inspector covers it
Covering a trench before the inspector sees it can mean digging it back up. Inspection scheduling, wait times and fees vary by office, so we don't quote them here.
How a Permitted Generator Install Usually Goes
Site visit to choose the pad spot, the fuel and the circuits you want backed up.
Free written estimate with permits and inspections listed as their own lines.
Permit applications filed with your building department.
Pad, conduit, wiring, transfer switch and fuel connection.
Rough and final inspections, plus any corrections the inspector asks for.
Startup, testing and a walk-through of how the system works.
What can slow a permit down
A site plan that does not show the generator location
A spot too close to a window, door or property line
Missing spec sheets or installation instructions
Gas work waiting on a separate permit or a meter change
Most delays go away when the location is settled early and everyone knows who files what.
Questions to Ask Your Building Department
Which permits does a standby generator need at my address?
Do you want a plot plan, spec sheets or a load calculation?
What placement, setback and noise rules apply here?
How are rough and final inspections booked, and does someone need to be home?
Can the application be filed online?
Write the answers down and share them with your installer before the pad is poured. When you're ready, request a free generator estimate and we'll walk through how the permit fits your job.
Generator guides
The switch the electrical permit covers
Where permit and inspection fit in the price
Match kW to the loads you want covered
Fuel choices and the gas side of the job
The full process, start to finish
Written, itemized and in advance
Frequently Asked Questions
Yes, for a home standby generator and its transfer switch. Michigan requires a permit before electrical equipment is added or changed. Gas piping often needs its own permit. Confirm the details with the building department for your address.
Your city or township building department, in most of Southeast Michigan. Where a community does not run its own electrical program, the state Bureau of Construction Codes issues it. Your mailing address alone does not tell you which office covers you.
Michigan allows homeowners to apply for electrical work on a single-family home they own and live in, with conditions set by the office. The owner then answers for the work and the inspections. We recommend a licensed electrician for a generator tie-in.
Often, yes. Gas piping to the generator is mechanical work, and many offices want a separate permit and pressure test for it. Some combine it with other permits. Ask your building department which applies.
Running cords from a portable generator to appliances does not. Adding an inlet box and an interlock or transfer switch to your panel is electrical work and generally needs one. Never backfeed through an outlet.
Fees are set by each township or city and change over time, so we don't list a number. Your building department's fee schedule has the current amount. Our written estimates show permit costs as their own line.
It depends on the office, the time of year and whether plan review is needed. Ask your building department when you apply. Choosing the generator spot early helps the application go through without changes.