ADU (Accessory Dwelling Unit) permit in Johnson City, TN
Yes — you need a permit for adu (accessory dwelling unit) work in Johnson City.
Building an accessory dwelling unit (garage apartment, casita, etc.) needs a permit. It is a habitable dwelling, so the state exemption for small non-habitable detached accessory structures of 200 square feet or less does not apply. The city also requires a zoning compliance permit before constructing any building, including an accessory structure, that costs more than $100 or exceeds 100 square feet (Sec. 16.3.1).
| Permit needed? | Yes |
|---|---|
| Where the line falls | Building an accessory dwelling unit (garage apartment, ca… |
| Fee | The Board of Commissioners may set a permit fee schedule (Sec. 16.4); no dollar amounts appear in the code. |
| Review time | Not in the ordinance |
| Code section | IRC R105.2; Sec. 16.3.1 (zoning compliance permit required) |
| Based on | IRC 2018 (Tennessee) with local zoning compliance permit |
How to pull the permit
- Put together a site plan showing where the work goes, with dimensions.
- Apply through the Johnson City 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
Doing work without the required permit violates the code. Each violation is a misdemeanor, and every day it continues counts as a separate offense (Sec. 16.6).
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 |
|---|---|---|---|
| Johnson City | — | Yes | Building an accessory dwelling unit (garage apartment, ca… |
| Kingsport | 15 mi | Yes | No size threshold in the code |
| Bristol | 17 mi | Yes | No size threshold in the code |
| Morristown | 52 mi | Yes | No size threshold in the code |
| Knoxville | 91 mi | Yes | Building an accessory dwelling unit (garage apartment, ca… |
| Farragut | 105 mi | Yes | No size threshold in the code |
See every Tennessee city on adu (accessory dwelling unit) work
Other work in Johnson City
Questions people ask
How much does a adu (accessory dwelling unit) permit cost in Johnson City?
The Board of Commissioners may set a permit fee schedule (Sec. 16.4); no dollar amounts appear in the code.. Valuation-based fees mean the number depends on what the job is worth, so the department quotes it when you apply.
I already built it without a permit. What now?
Johnson City 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.