Water Heater Permit Requirements in Smithville, TN
City of Smithville is the AHJ: listed EXEMPT on the TN State Fire Marshal residential jurisdictions list, meaning it enforces its own local building codes (not the state, not DeKalb County). Building and Zoning at City Hall, 104 E. Main St Ste 103, 615-597-4745 ext. 2. TN statewide residential minimum is the 2018 IRC (with 2018 IECC); the city does not publish its own specific adopted edition or a fee schedule online and directs fee questions to ext. 2. DeKalb County is separately exempt for unincorporated areas (inspector Lewis Bryant, 931-644-3935). County seat of DeKalb County.
By Joey, Founder · Last verified May 31, 2026 · How we research →
When you need a Water Heater permit
Replacing a water heater requires a permit from the City of Smithville (City Hall, Building and Zoning), the AHJ enforcing the 2018 IRC plumbing and fuel-gas provisions. A temperature-and-pressure relief discharge line and, for gas units, proper venting and combustion air are required. Confirm requirements with City Hall, 615-597-4745 ext. 2.
Water Heater Permit Costs: Smithville vs. Nearby
| City | Estimated Fee |
|---|---|
| Smithville | N/A |
| Nashville | $25 – $500 |
| Memphis | $25 – $500 |
| Knoxville | $25 – $500 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Smithville permit costs →
Zoning Considerations
Water heater installation is almost never subject to zoning review, it is a plumbing and mechanical code matter. Exterior tankless units on the outside of the house may be subject to minor setback rules in some jurisdictions.
Estimated Project Timeline
Here's a typical timeline for a water heater project:
Timeline is based on the typical 5 business days permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Contact the building department for current Water Heater permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Water Heater 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 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.
Typical approval time for Water Heater permits is 5 business days. More complex projects may take longer if plan review is required.
Learn More About Water Heater Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Water Heater Guide →