HVAC Permit in St. Louis (2026)
HVAC permit requirements, fees, and process for St. Louis, MO. Find out if you need a permit and how to apply.
Yes, a HVAC permit is required in St. Louis, MO.
A HVAC permit is required in St. Louis, MO. The St. Louis Building Division (Community Development Administration) handles permit applications for St. Louis. Below you will find the current thresholds, fees, and process for obtaining a hvac permit in St. Louis.
When Is a Permit Required?
When a HVAC Permit Is Required in St. Louis: All HVAC installations and replacements
Permit Fees
HVAC Permit Fees in St. Louis: $100-$400. Estimated timeline: 2-3 weeks.
Estimated timeline: 2-3 weeks
How to Get a HVAC Permit in St. Louis
Verify whether your project meets the permit threshold in St. Louis: All HVAC installations and replacements.
Prepare your permit application and plans. Contact the St. Louis Building Division (Community Development Administration) at https://stlouis-mo.gov/government/departments/building for required documentation.
Submit your application online at https://stlouis-mo.gov/government/departments/building/permits.cfm or in person at the St. Louis Building Division (Community Development Administration).
Pay the permit fee: $100-$400.
Wait for plan check approval. Estimated timeline: 2-3 weeks.
Schedule required inspections through https://stlouis-mo.gov/government/departments/building/inspections.cfm. All inspections must pass before project is finalized.
Important: St. Louis Building Division mechanical permit. Ameren Missouri natural gas service. Missouri-licensed HVAC contractor required. St. Louis's climate requires both strong heating and cooling systems.
St. Louis Building Division (Community Development Administration)
Frequently Asked Questions
Source: St. Louis Building Code — HVAC Requirements. Last verified April 6, 2026. View source