HVAC Replacement permit in Denton, TX
Yes — you need a permit for hvac replacement work in Denton.
Replacing an air conditioner, furnace, or heat pump needs a mechanical permit. The city adopted the 2021 International Mechanical Code, and a full unit change-out is not a portable appliance or a minor part swap, so it is not exempt; a gas furnace also needs a gas permit.
| 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 | R105.2 (Mechanical) exemptions cover only portable units and minor part swaps; R108.6 |
| Based on | 2021 IRC as amended (Sec. 28-34); 2021 International Mechanical Code as amended (Sec. 28-77) |
How to pull the permit
- Put together a site plan showing where the work goes, with dimensions.
- Apply through the Denton 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.
If you skip it
If you start work on a mechanical or gas system that needs a permit before you get it, you must still pay the required permit fees set by the City's fee schedule (R108.6).
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 |
|---|---|---|---|
| Denton | — | Yes | Replacing an air conditioner, furnace, or heat pump needs… |
| Plano | 26 mi | Yes | Replacing an air conditioner, furnace, or heat pump needs… |
| McKinney | 28 mi | Yes | Replacing an air conditioner, furnace, or heat pump needs… |
| Allen | 28 mi | Yes | No size threshold in the code |
| Richardson | 30 mi | Yes | No size threshold in the code |
| Grand Prairie | 37 mi | Yes | Replacing an air conditioner, furnace, or heat pump is me… |
Other work in Denton
Questions people ask
I already built it without a permit. What now?
Denton 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.