Do I need a permit to replace a furnace or AC in Minneapolis or Saint Paul?
Yes, in both cities a furnace, boiler, central AC or heat pump replacement needs a city permit, and the installing contractor normally pulls it. Minneapolis handles mechanical permits through its Community Planning and Economic Development department; Saint Paul's Department of Safety and Inspections issues mechanical and warm air permits. An inspector checks the finished work.
Key points
- Replacing a furnace, boiler, central AC or heat pump needs a city permit in both Minneapolis and Saint Paul.
- Saint Paul says furnace and AC installations need a mechanical permit and a warm air/ventilation permit, plus an electrical permit.
- Minneapolis lets owner-occupants do their own mechanical work, but not on gas-fired heating equipment.
- DLI says Minnesota has no state license for mechanical contractors; the two cities license HVAC contractors themselves.
- Each city sets its own fees, so the permit should show up as its own line on your written quote.
Yes. Replacing a furnace, boiler, central air conditioner or heat pump in Minneapolis or Saint Paul takes a city permit, and when a contractor does the job, the contractor pulls it, calls for the inspection and fixes anything the inspector flags. Minneapolis runs mechanical permits through its Community Planning and Economic Development department (CPED). Saint Paul runs them through its Department of Safety and Inspections (DSI), and a furnace or AC swap there takes more than one permit. Swapping a small part, like an igniter or a capacitor, generally doesn't need one.
What HVAC work needs a permit in Minneapolis?
Minneapolis puts it plainly on its permit page: most heating, air conditioning, ventilation, refrigeration and gas piping work requires a permit. In practice that covers:
- Replacing a furnace or boiler
- Replacing or adding a central air conditioner or heat pump
- Installing a ductless mini-split
- New or altered gas piping, such as a line to a new appliance
- New ductwork, or changes to the venting
- The electrical hookup for new equipment, which can need its own electrical permit
Minneapolis's list of work exempt from permits includes replacing a minor part that doesn't change the equipment's approval, and installing portable or self-contained appliances, like a plug-in space heater. If you're unsure about a job, ask before the work starts.
The standards come from the state. The Minnesota Mechanical Code, part of Minnesota Rules chapter 1346 (the Minnesota Mechanical and Fuel Gas Codes), is built on the 2018 International Mechanical Code. Cities enforce it and add their own licensing and paperwork.
Minneapolis and Saint Paul side by side
| Minneapolis | Saint Paul | |
|---|---|---|
| Who issues HVAC permits | Community Planning and Economic Development (CPED) | Department of Safety and Inspections (DSI) |
| Furnace or central AC replacement | Mechanical permit | Mechanical and warm air/ventilation permits, plus an electrical permit |
| Boiler replacement | Mechanical permit | Mechanical permit, plus an electrical permit |
| Ductwork added or changed | Mechanical permit | Warm air/ventilation permit |
| Electrical permit | Issued and scheduled by the State | Issued by DSI |
| Owner doing their own work | Owner-occupants, except on gas-fired heating equipment | Homesteading owners, by affidavit, doing the work personally |
Minneapolis. Permit applications go to Minneapolis Development Review, part of CPED, and CPED's Construction Code Services publishes the city's guide on when to call for inspections. Plumbing, mechanical and building inspections are done by different Minneapolis inspectors, and electrical permits come from the State.
Saint Paul. DSI's page for air conditioner, furnace and boiler installations covers the electrical permit and says AC and furnace installations also require a Warm Air/Ventilation/General Sheet Metal permit and a Mechanical permit. Ductwork falls under warm air and ventilation. For the boiler and radiator systems common in older Saint Paul homes, see boiler vs furnace in Saint Paul.
The suburbs and Wisconsin. In the suburbs, the permit normally comes from the city's building department, or from the county or state where a city doesn't have one. Hudson, River Falls and Prescott follow Wisconsin's rules. The contractor should know which office covers your address.
Who pulls the HVAC permit, the contractor or the homeowner?
On a contractor job, the contractor pulls the permit and handles the inspection. That's how it works on our installs: we pull the permits before work starts and list them on the quote for a furnace replacement in Minneapolis or a furnace replacement in Saint Paul.
Homeowners can pull their own permits in both cities, but only for work they do themselves:
- Minneapolis says people who own and live in the home can do their own plumbing or mechanical work, and that they are not allowed to work on gas-fired heating equipment. So an owner can't pull a permit to swap their own gas furnace.
- Saint Paul lets a homesteading owner apply by affidavit for a single-family home, the owner's side of a side-by-side duplex, or the owner's side-by-side townhome, where rated walls separate the units. The owner has to do the work personally, and the affidavit says homeowner work on property that's rented, leased or occupied by others is unlawful.
If a contractor suggests you pull the permit in your own name, or skip it to save money, treat that as a warning. A permit in your name puts the inspection and any corrections on you.
Does Minnesota license HVAC contractors?
The Minnesota Department of Labor and Industry says there is no state license for mechanical contractors. Instead, a business has to file a $25,000 mechanical contractor bond with DLI to contract gas, heating, ventilation, cooling, air conditioning, fuel burning or refrigeration work, and then meet local licensing rules. The two cities license the trade themselves:
- Minneapolis issues HVAC Class A licenses, for contractors who install, fix and clean heating, air conditioning and ventilation systems, and Class B licenses for cleaning only. Both require the state bond, and the city publishes a list of the mechanical contractors it licenses.
- Saint Paul issues Warm Air and Ventilation business trade licenses. It requires a Saint Paul Certificate of Competency (or a Minneapolis Master's Card), insurance and the bond on file with DLI.
Ask any contractor which city license they hold, and check it before you sign. Our guide to choosing an HVAC contractor in Minneapolis covers the rest of what to ask.
How a permitted replacement goes
- Load calculation and written quote. Saint Paul's DSI handout on furnace replacements says a replacement needs a whole-house heat loss calculation. We size every furnace replacement with a Manual J, and the permits are lines on the quote.
- Permit application. The contractor applies before work starts. In Saint Paul, a furnace or AC job means the mechanical, warm air and electrical permits together.
- Inspection request. Minneapolis's handout puts it on the person doing the permitted work to call for inspections when the work is ready and accessible. The inspection record card has to be at the house for every inspection.
- Final inspection. The final mechanical inspection comes after the equipment is set and the heating and electrical work is done.
- Corrections and sign-off. If the inspector flags something in the installation, the installer fixes it and the inspector signs off.
- Paperwork. Keep the permit number, the inspection record, the invoice and the warranty registration together. Those answer most of what a buyer, an insurer or the next technician will ask.
What does the inspector check on an HVAC replacement?
Details vary by city and by job, but on a typical furnace or AC replacement the inspector checks:
- Gas piping: proper fittings, a shutoff and sediment trap at the appliance, correct sizing, and no leaks. Our gas line guide covers when the piping itself needs work.
- Venting: the right vent material for the furnace, proper slope, and exhaust terminations placed away from windows, doors and the gas meter. For an 80% furnace, the chimney or flue connection and any water heater sharing it.
- Combustion air: enough air for the burners, especially in small mechanical rooms.
- Condensate: a proper drain route for condensing furnaces and AC coils.
- Clearances and access: space around the equipment for service and safety.
- Outdoor equipment: the condenser or heat pump set level on a pad or stand, with the refrigerant lines supported and insulated.
- Electrical: a disconnect for the outdoor unit and correct circuit protection. In Minneapolis, the State inspects this part.
While the furnace is being replaced, check your CO alarms too. Minnesota law requires working CO alarms within 10 feet of every sleeping room; see CO detector placement.
What Minnesota details come up at an HVAC inspection?
- Snow and vent terminations. High-efficiency furnaces vent through PVC out a side wall or the roof. The termination has to sit where drifting snow won't bury it, because a blocked intake or exhaust shuts the furnace down on the coldest nights.
- The orphaned water heater. Going from an 80% furnace to a 90%+ model takes the furnace off the chimney. A gas water heater left alone in a chimney sized for two appliances may need a liner.
- Sizing. Saint Paul's handout, citing the Minnesota Residential Energy Code, lists the metro's design temperatures as -15°F in winter and 88°F in summer, and caps heating equipment at 40% over the calculated load (15% for cooling). That takes a load calculation, not a copy of the old nameplate.
- Old city houses. Boiler piping and old ductwork in pre-war Minneapolis and Saint Paul houses can be wrapped in material that should be tested for asbestos before anyone cuts it. If it tests positive, a licensed abatement contractor deals with it first.
What permits cost
Each city sets its own fees, and they change, so we don't print numbers here. What matters is that each permit shows up as a line on the written quote; a lower bid that leaves them off isn't lower. Our Minneapolis HVAC cost guide and Saint Paul HVAC cost guide show where the permit sits among the other line items on a replacement.
Unpermitted work can come back later. It can complicate a home sale when a buyer's inspector asks about new equipment with no permit record, and it leaves you without the city's independent check of the gas and venting.
What to do next
If you're planning a replacement, call 612-429-3465, any day from 7am to 9pm. We'll do the load calculation, write a flat-rate quote with the permits included, and schedule the inspection when the work is done. If the old furnace just needs a part, many repairs don't need a permit at all, and the $79 trip charge is waived when you approve the repair.
Questions
Can a homeowner pull their own HVAC permit in Minneapolis or Saint Paul?
Only for work they do themselves, and with limits. Minneapolis lets people who own and live in the home do their own mechanical work, but says they may not work on gas-fired heating equipment. Saint Paul lets a homesteading owner apply by affidavit and requires the owner to do the work personally; its affidavit says homeowner work on property that's rented, leased or occupied by others is unlawful. When a contractor does the job, the contractor pulls the permit.
How much does an HVAC permit cost in Minneapolis?
The city sets the fee and changes it from time to time, so we don't quote a number here; Minneapolis posts its current residential mechanical permit fees on the city's website. On our installs the permit is part of the written, flat-rate quote, listed as its own line. If you're comparing bids, make sure each one includes the permit rather than leaving it off to look cheaper.
What happens if the inspection fails?
The inspector notes what needs to change, the contractor corrects it, and the inspector comes back or signs off. When the problem is in the installation, fixing it is the installer's job, not yours. Common items are vent terminations, clearances, gas piping details at the appliance, a missing condensate route, and labels or paperwork that weren't left with the equipment.
Does Minnesota license HVAC contractors?
Not at the state level. The Minnesota Department of Labor and Industry says there is no state license for mechanical contractors. Instead, a business that contracts gas, heating, ventilation, cooling, air conditioning, fuel burning or refrigeration work files a $25,000 mechanical contractor bond with DLI and meets local licensing rules. Minneapolis issues HVAC Class A and B licenses, and Saint Paul issues Warm Air and Ventilation business trade licenses.
Sources
- Minnesota Mechanical and Fuel Gas Codes revisor.mn.gov
- $25,000 mechanical contractor bond with DLI dli.mn.gov