HVAC 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 HVAC permit in St. Johns County
Replacing a furnace, AC condenser, or heat pump in the same location and capacity still requires a mechanical permit. A Florida-licensed mechanical or Class A/B air-conditioning contractor (CILB) is required.
Installing a new HVAC system (where none existed, or a major capacity change) requires a mechanical permit, a Manual J load calculation, and a Florida-licensed mechanical contractor.
Modifying or extending ductwork as part of a remodel requires a mechanical permit. The duct system must meet FBCR 8th Edition M1601 sizing and sealing requirements and FBC Energy Conservation sealing rules.
HVAC Permit Costs: St. Johns County vs. Nearby
St. Johns County's fees are right in line with the Florida average, $100 – $450 versus $106 – $356 statewide.
| City | Estimated Fee |
|---|---|
| St. Johns County | $100 – $450 |
| Jacksonville | $60 – $200 |
| Miami | $98 – $1,300 |
| Tampa | $68 – $900 |
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
If you live in an HOA community: some HOAs regulate outdoor HVAC equipment placement and noise levels. Exterior condenser units, mini-split heads, and equipment pads may require screening or placement approval.
Estimated Project Timeline in St. Johns County
Here's a typical timeline for a hvac 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 HVAC projects in St. Johns County, FL range from $100 – $450. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller HVAC 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 HVAC permits in St. Johns County is about 1 week. 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 HVAC Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read HVAC Guide →