HVAC Permit in St. Louis, Missouri
It depends
Sometimes, depending on the project
Before installing or replacing a furnace, condensing unit, combination system, boiler, exhaust fan, hood or ventilation system. Emergency equipment replacements may start once the application is filed online.
Issued byCity of St. Louis Building Division, Permit Section (Department of Public Safety)
By Mario Bailey, verified against official sources
Quick answer
Mechanical permits in St. Louis are pulled by mechanical contractors licensed by the City, not by homeowners, and the Building Division states they are required to install boilers, furnaces, exhaust fans and hoods, and ventilation systems. The Mechanical Code allows only a short list of exemptions: portable heating, cooling, ventilation and cooking equipment, portable evaporative coolers, portable fuel cell appliances not tied to the grid, replacement of a minor part that does not alter equipment approval or make it unsafe, and small self-contained refrigeration systems. A window unit or a plug-in space heater therefore falls outside the permit, while a furnace or condenser swap does not. When an emergency replacement cannot wait, the code allows work to begin once the application has been submitted online at stlcitypermits.com.
Who is pulling this permit?
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When a permit is usually needed
Before installing or replacing a furnace, condensing unit, combination system, boiler, exhaust fan, hood or ventilation system. Emergency equipment replacements may start once the application is filed online.
What an HVAC permit costs in St. Louis
How to apply in St. Louis
In St. Louis, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb.
What most HVAC permit applications include:
- For St. Louis, a mechanical permit is required before anyone may install, alter, repair, remove, convert, or replace a heating, ventilating, or air conditioning system regulated by the code, and the work may not begin until the application is submitted and the permit is issued (IRC R105.1).
- For St. Louis, the application identifies the specific equipment being installed, such as a furnace, heat pump, or air conditioner, since the unit must be installed according to its listing and the manufacturer's installation instructions (IRC M1401.1).
- For St. Louis, the proposed equipment location must leave the clearances needed to clean coils and replace filters, blowers, motors, and controls after installation (IRC M1401.2).
- For St. Louis, the application carries the equipment sizing basis: ACCA Manual J building loads and Manual S equipment selection, or another approved sizing method, not a rule of thumb (IRC M1401.3).
- For a split system, the work covered by the permit includes refrigerant suction line insulation, since the piping is inspected against that standard once installed (IRC M1411.6).
General submittal guidance from International Residential Code (IRC), 2021 edition, Chapter 1 (Permits) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. City of St. Louis Building Division, Permit Section (Department of Public Safety) sets the exact checklist for St. Louis.
Where to apply in St. Louis:
City of St. Louis Building Division, Permit Section (Department of Public Safety)
- Building Division Permit Section, City Hall, 1200 Market Street, Room 425, St. Louis, MO 63103
- Phone: (314) 622-3313
- Email: stlcitypermits@stlouis-mo.gov
HVAC Permit in St. Louis compared with nearby Missouri localities
| Locality | Permit needed? | Threshold | What each Missouri schedule says | Verified |
|---|---|---|---|---|
| St. Louis | It depends | Before installing or replacing a furnace, condensing unit, combination system, boiler... | There is a $25.00 application fee for each permit | |
| Kansas City | It depends | Before installing, altering, servicing, replacing or repairing a heating, ventilating... | ...run on the same valuation table as building permits, Sec. 18-20(b)(2): $52.00 for... |
Inspections and closing out your permit
In St. Louis, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
- In St. Louis: rough inspection of the mechanical and gas systems must be made before the work is covered or concealed, before fixtures or appliances are set or installed, and before the framing inspection (IRC R109.1.2).
- In St. Louis: where a cooling coil is added to an existing warm air furnace, the rough in confirms the coil is not installed upstream of the heat exchanger unless the furnace is listed for it, and that the blower can handle the added static pressure (IRC M1411.2).
- In St. Louis: the rough in and final both confirm the appliance access opening and working space are large enough to service the unit (IRC M1305.1).
- In St. Louis: at final inspection, the inspector verifies the equipment has adequate combustion air, with openings kept clear for the distance the code requires (IRC M1402.3).
- In St. Louis: final inspection also checks that the condensate line drains to an approved point of disposal with the required slope and does not create a nuisance (IRC M1411.3).
- In St. Louis: for a straight equipment changeout with no new ductwork, many permit offices require only a single final inspection, while a new installation still gets a rough in inspection before the final (common local inspection practice).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the St. Louis permit portal or by phone at (314) 622-3313.
Inspection sequence from International Residential Code (IRC), 2021 edition, Section R109 (Required Inspections) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. An open permit left un-inspected can surface later in a title search or home sale.
Your HVAC Permit checklist for St. Louis
- Confirm the requirement. Sometimes, depending on the project. Usually needed: Before installing or replacing a furnace, condensing unit, combination system, boiler, exhaust fan, hood or ventilation system. Emergency equipment replacements may start once the application is filed online.
- Budget the fee. Mechanical permit fees are established by City Ordinance 70800. There is a $25.00 application fee for each permit. Under "Residential Fees Use Groups R1, R2, and R3": furnaces $40.00 each, condensing units $40.00 each, combination furnace/condensing unit $40.00 each. Re-inspection for faulty or incomplete work is $25.00 each, failure to request an inspection is $50.00 per permit, and a special inspection is $40.00 each. Official fee schedule.
- Apply. In St. Louis, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb. Start at the St. Louis permit portal.
- Keep the office details handy. City of St. Louis Building Division, Permit Section (Department of Public Safety). Phone: (314) 622-3313. Address: Building Division Permit Section, City Hall, 1200 Market Street, Room 425, St. Louis, MO 63103.
- Plan for inspections. In St. Louis, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need an HVAC permit in St. Louis?
- Mechanical permits in St. Louis are pulled by mechanical contractors licensed by the City, not by homeowners, and the Building Division states they are required to install boilers, furnaces, exhaust fans and hoods, and ventilation systems. The Mechanical Code allows only a short list of exemptions: portable heating, cooling, ventilation and cooking equipment, portable evaporative coolers, portable fuel cell appliances not tied to the grid, replacement of a minor part that does not alter equipment approval or make it unsafe, and small self-contained refrigeration systems. A window unit or a plug-in space heater therefore falls outside the permit, while a furnace or condenser swap does not. When an emergency replacement cannot wait, the code allows work to begin once the application has been submitted online at stlcitypermits.com. Always confirm with the City of St. Louis Building Division, Permit Section (Department of Public Safety) before starting.
- How much does an HVAC permit cost in St. Louis?
- Mechanical permit fees are established by City Ordinance 70800. There is a $25.00 application fee for each permit. Under "Residential Fees Use Groups R1, R2, and R3": furnaces $40.00 each, condensing units $40.00 each, combination furnace/condensing unit $40.00 each. Re-inspection for faulty or incomplete work is $25.00 each, failure to request an inspection is $50.00 per permit, and a special inspection is $40.00 each. See the official fee schedule for current amounts.
- How long does an HVAC permit take in St. Louis?
- Approved permit or feedback by email within 10 business days of submission, and most applications are approved within 1 to 3 business days. Times can vary by workload and project scope, so confirm with the office.
- Where do you apply for an HVAC permit in St. Louis?
- You can apply through the St. Louis permit portal or contact the City of St. Louis Building Division, Permit Section (Department of Public Safety) directly. The links are listed on this page.
- Can a homeowner pull an HVAC permit themselves in St. Louis?
- Under Missouri law (RSMo 701.055.1 and 701.055.2; RSMo 327.101.2(5)(a); RSMo 327.191.2(5)(a); RSMo 700.656.5): Missouri does not license general contractors at the state level and has no statewide owner-builder permit statute, disclosure affidavit, or resale restriction comparable to Florida's one year rule. Whether a homeowner may pull the permit and do the work is decided by the city or county that issues the permit. Where state law does speak, it is permissive: RSMo 327.101.2(5)(a) and RSMo 327.191.2(5)(a) let an unlicensed person render architectural and engineering services for the construction, remodeling or repair of a privately owned dwelling house, provided the drawings say the person is not licensed, so plans for a house do not have to be sealed by an architect or engineer. RSMo 701.055.1 expressly preserves a property owner's right to install, modify or repair their own on-site sewage disposal system as long as the state standard is met, and RSMo 701.055.2 adds that no permit or contractor registration is required simply to clean it. RSMo 700.656.5 exempts a person who installs a manufactured home on his or her own property for his or her own occupancy from the otherwise mandatory state installer license. None of these exemptions excuses a local permit where the local jurisdiction requires one. Confirm how St. Louis applies this before you apply.
From the Library
What else needs a permit in St. Louis
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | inches above adjacent grade for an uncovered wood deck or patio resting directly on the ground or a rock base with no permanent foundation | Charged as a building permit on estimated construction cost: $25.00 application fee plus... |
| Electrical Permit | It depends | Before starting any electrical work other than the code's listed minor repairs, and... | The application fee for all electrical permits is $25.00 |
| Fence Permit | It depends | Before building any new fence | The Building Division's published building permit schedule charges a $25.00 application... |
| Patio Permit | It depends | Not needed for a flat, open, at-grade paved patio on the same lot as the house | A patio cover is charged as a building permit on estimated construction cost: $25.00... |
| Plumbing Permit | It depends | Before any plumbing, drainlaying or process drainage work, any connection to a sewer... | The application fee for all plumbing permits is $30.00 |
| Pool Permit | It depends | inches of water depth, applied together with a 250 square foot surface area test | Charged as a building permit on estimated construction cost: $25.00 application fee plus... |
| Roof Replacement Permit | It depends | percent of roof sheathing removed and replaced during a like-material roof covering replacement | ...building permit for alterations and repairs on estimated construction cost: $25.00... |
| Shed Permit | It depends | square feet of floor area for a detached accessory building, which must also keep the setbacks required by the Zoning Ordinance | Charged as a building permit on estimated construction cost: $25.00 application fee plus... |
| Solar Permit | Permit required | Any size | Charged as a building permit on estimated construction cost: $25.00 application fee plus... |
HVAC Permit in other Missouri localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not St. Louis documents; the office above sets the local rules.
How this HVAC permit page for St. Louis was verified. 2 official sources: stlouis-mo.gov, stlouis-mo.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with City of St. Louis Building Division, Permit Section (Department of Public Safety). Rules change; confirm before you build. How we verify.
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