HVAC Replacement permit in Chattanooga, TN
Yes — you need a permit for hvac replacement work in Chattanooga.
Replacing an air conditioner, furnace, or heat pump needs a mechanical permit, and the work must be done by a licensed mechanical contractor. The state exemptions only cover portable heaters, portable coolers, portable ventilation units, and small self-contained refrigeration systems, so a whole-house system is not exempt.
| Permit needed? | Yes |
|---|---|
| Where the line falls | Replacing an air conditioner, furnace, or heat pump needs… |
| Fee | Not in the ordinance — the department quotes it |
| Review time | Not in the ordinance |
| Code section | Sec. 22.5-59 (license required for mechanical work) |
| Based on | City Mechanical Code, Chapter 22.5 (with IRC 2018) |
How to pull the permit
- Put together a site plan showing where the work goes, with dimensions.
- Apply through the Chattanooga building department.
- Pay the permit fee when the permit is issued. Work done before that isn't covered.
- Book each inspection listed on the permit as the job reaches that stage.
Your contractor pulls this one, not you. Ask to see the permit before work starts.
If you skip it
Chattanooga's code doesn't set a specific fine for this work. In practice the department can issue a stop-work order, and unpermitted work tends to surface during a sale, when the buyer's inspector or the title company asks for it.
Nearby cities, same job
Rules stop at the city line. If your lot is near a boundary, or you work across several towns, this is where they differ.
| City | Distance | Permit? | Where the line falls |
|---|---|---|---|
| Chattanooga | — | Yes | Replacing an air conditioner, furnace, or heat pump needs… |
| Farragut | 82 mi | Yes | No size threshold in the code |
| Murfreesboro | 86 mi | No | Replacing like package or split HVAC equipment that is pe… |
| Smyrna | 95 mi | Yes | Replacing a full air conditioner, furnace, or heat pump n… |
| Knoxville | 96 mi | Yes | Replacing an air conditioner, furnace, or heat pump needs… |
| La Vergne | 99 mi | Depends | exempt if heating and cooling capacity and fuel source st… |
Other work in Chattanooga
Questions people ask
I already built it without a permit. What now?
Chattanooga can issue a stop-work order and require you to apply after the fact, sometimes with an extra fee. Work that was covered up may have to be opened for inspection. Full walkthrough here.
Does unpermitted work cause problems when selling the house?
Often, yes. A buyer's inspector or the title company may flag it, and lenders can balk at financing a home with open or missing permits. What to do about it.
Do I pull the permit or does my contractor?
Your contractor does. A licensed contractor pulling their own permit is the normal arrangement — if one asks you to pull it in your name, treat that as a warning sign, because it moves the liability to you.