ADU / Guest House Permit Requirements in Maynardville, TN
Union County is EXEMPT on the TN State Fire Marshal's residential jurisdictions list, meaning it enforces building codes locally. Building permits must be purchased in person at the Assessor of Property office — no online portal. Fee schedule not published online; call (865) 992-3211 for current fees. Tennessee state electrical permits required separately (inspector: Eric Ramsey, (423) 626-0724). Contractor licensing: TN statewide $25,000+ threshold; no HIC requirement in Union County.
When you DO need a permit
TN (Union County), building a detached ADU (accessory dwelling unit or guest house) requires a building permit as new residential construction under Tennessee state law. Electrical, plumbing, and mechanical permits are also required. Contact the Union County Assessor of Property at (865) 992-3211.
Source: Tennessee State Building Codes / TCA 68-120-101 — new construction
TN (Union County), converting space into an attached ADU or adding an attached dwelling unit requires building, electrical, plumbing, and mechanical permits. This is treated as an addition under Tennessee state law. Permits must be purchased in person at the Union County Assessor of Property office.
Source: Tennessee State Building Codes / TCA 68-120-101 — additions over 30 sq ft
TN (Union County), converting an existing structure (garage, basement) into a dwelling unit requires building, electrical, and plumbing permits. Creating habitable space triggers building permit requirements. Contact the Assessor of Property at (865) 992-3211.
Source: Tennessee State Building Codes / 2018 IRC — Union County local enforcement
ADU / Guest House Permit Costs: Maynardville vs. Nearby
| City | Estimated Fee |
|---|---|
| Maynardville | — |
| Nashville | $1,000 – $5,000 |
| Nashville | $500 – $3,000 |
| Nashville | $800 – $4,000 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation.
Zoning Considerations
ADU regulations vary dramatically by state and city. Many states (CA, OR, WA) have preemption laws that override local zoning restrictions. Check both state law and local zoning before designing.
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Frequently Asked Questions
Contact Maynardville's building department for current ADU / Guest House permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller ADU / Guest House projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Maynardville can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Contact Maynardville's building department for current processing times. Timelines vary based on project complexity and whether plan review is required.
Learn More About ADU / Guest House Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read ADU / Guest House Guide →