Water Heater Permit Requirements in St. Johns County, FL
St. Johns County Building Services issues all residential permits (building, electrical, mechanical, plumbing, roof, pool) for unincorporated county land outside the City of St. Augustine and City of St. Augustine Beach. Codes in force: Florida Building Code 8th Edition (2023) residential and building, NEC 2020, ASCE 7-22 wind design. County is in the wind-borne debris region (not HVHZ, which is only Miami-Dade and Broward). Impact-rated windows and doors or approved storm shutters required for residential openings. Septic permits handled by Florida Department of Health in St. Johns County at (904) 506-6081. Driveways on county roads go through St. Johns County Road and Bridge; driveways on US-1 or I-95 require FDOT approval. Historic district overlays may apply in some areas. Licensed FL CILB contractors required for most trades; owner-builder allowed under F.S. 489.103(7) for homesteaded primary residence with personal supervision affidavit.
By Joey, Founder · Last verified April 20, 2026 · How we research →
When you need a Water Heater permit in St. Johns County
Water heater replacement (same fuel type, similar capacity) requires a plumbing permit. A Florida-licensed plumber is required. The T&P relief valve discharge must terminate per FBCR 8th Edition P2804, and the unit must be strapped/secured.
Changing fuel type (electric to gas, gas to tankless, etc.) requires plumbing, mechanical, and possibly electrical permits. Florida-licensed plumber, gas contractor, and electrician are required.
Water Heater Permit Costs: St. Johns County vs. Nearby
St. Johns County's fees are right in line with the Florida average, $75 – $400 versus $93 – $386 statewide.
| City | Estimated Fee |
|---|---|
| St. Johns County | $75 – $400 |
| Jacksonville | $25 – $500 |
| Miami | $25 – $500 |
| Tampa | $25 – $500 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all St. Johns County permit costs →
Zoning & HOA 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.
If you live in an HOA community: hOAs rarely regulate interior water heaters. Exterior tankless units mounted on visible walls may face aesthetic review requirements in some communities.
Estimated Project Timeline in St. Johns County
Here's a typical timeline for a water heater project in St. Johns County, FL:
Timeline is based on St. Johns County's typical about 2 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Estimated permit fees for Water Heater projects in St. Johns County, FL range from $75 – $400. Fees 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 in St. Johns County 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 in St. Johns County is 5 business days. More complex projects may take longer if plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Water Heater Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Water Heater Guide →