Building permits, zoning and land rules in St. Lucie County, Florida

Yes. St. Lucie County requires a permit for construction, erection, alteration, repair and occupancy of buildings in unincorporated St. Lucie County¹. Florida has adopted the Florida Building Code statewide, and its 8th Edition became effective December 31, 2023^11,12. Development in unincorporated St. Lucie County, including a driveway connection, is not authorized without the necessary Development Permits, and a Certificate of Zoning Compliance comes first¹³. County development-review applications are accepted only after the minimum submittals are provided, then transmitted to the Development Review Committee; requirements vary by application type and more may emerge during review². Florida's owner-builder exemption requires direct onsite supervision, personal signature on the permit application, owner occupancy or use, and compliance with building and zoning rules; a sale or lease within one year creates a presumption that the work was undertaken for sale or lease⁸. County fees include a $75 minimum plan-review fee; the listed single-family residence fee is $250 for a contractor permit or $350 for an owner-builder permit, before other applicable charges¹⁴.

Building permits for unincorporated St. Lucie County are issued by the county's Planning and Development Services Permitting/Zoning Division¹⁵. The permit center is at 2300 Virginia Avenue, first floor, southwest corner of the building, in Fort Pierce, open Monday through Friday from 8:00 a.m. to 4:30 p.m.; call (772) 462-1553¹⁵. The same division administers zoning for unincorporated areas, making it the first stop for both a parcel's zoning district and its building-permit path⁶. The county's rules here apply to unincorporated land; whether Fort Pierce runs its own building permits we could not confirm, so ask the city. The county publishes building and zoning fees, including $25 for zoning verification and $25 for a flood-zone verification letter¹⁴.

Yes. Unincorporated St. Lucie County has county zoning and land-development regulation; Chapters 3, 4 and 7 of the Land Development Code cover zoning districts, overlays and development-design standards². Inside Fort Pierce, the city adopts its own zoning districts³; the county's zoning rules do not apply there. A zoning district must be compatible with the parcel's future-land-use designation unless a corresponding map amendment is requested⁶. In Residential Estate areas, intended for large-lot homes at one unit per gross acre, central utilities are not required, though connections should be provided when practical⁶. Under the Towns, Villages and Countryside policies, an accessory dwelling is limited: an individual lot owner need only verify potable water and sanitary sewer service, and an RV or mobile home is not an accessory dwelling¹⁶. Oak Ridge Ranches has separate site-specific rules, including parking and traffic review, no separate sale or subdivision of the accessory unit, and an affordability limit if it is rented⁶. We could not confirm countywide minimum dwelling size, minimum lot size or setback figures; ask the Permitting/Zoning Division for the standards tied to the parcel's district¹⁵.

The Florida Department of Health's local county health department issues onsite sewage treatment and disposal system permits in St. Lucie County, and that applies in city and county alike⁴. Submit the septic application, site plan, building floor plan and fee to the local health department; a qualified professional must perform a site evaluation, and the final fee depends on the system and requested services⁴. The local instructions also call for a private soil evaluation, scaled site plan, three floor-plan copies and three site-plan copies; clear the lot and provide access information before applying⁷. Only about 0.4% of county soil is rated without severe limitations for a conventional drain field, making early evaluation especially important¹⁰. Since July 1, 2022, an owner, or a contractor with the owner's authorization, may hire a private provider to perform septic inspections⁷.

Unincorporated St. Lucie County restricts using an RV-type unit as a residence outside an approved campground or travel-trailer park, subject to a possible code exception⁹. A gratuitous guest may temporarily occupy an RV for no more than 72 hours in any 30-day period⁹. An RV or mobile home also does not qualify as an accessory dwelling under the Towns, Villages and Countryside policy¹⁶. We could not confirm a complete tiny-home occupancy rule or countywide minimum dwelling size. A tiny home proposed as a dwelling still requires building-permit and zoning review, so ask the Permitting/Zoning Division whether the parcel's district and the proposed structure qualify^1,6,15.

1. Confirm the parcel's zoning district, future-land-use designation and proposed use with the Permitting/Zoning Division^6,15.
2. If dividing land, prepare for subdivision review and a preliminary record plat with property-owner or homeowners-association documents; additional requirements may arise during review².
3. If the parcel is off sewer, obtain a site evaluation and submit the septic application, site plan, floor plan and fee to the local health department⁴.
4. If the parcel needs a private well, apply through the local health department, which permits all wells in St. Lucie County⁵.
5. Choose a licensed contractor or satisfy the owner-builder conditions, including direct onsite supervision and owner occupancy or use⁸.
6. Submit complete building and development-review materials; incomplete applications are not accepted for review².
7. In an identified 100-year flood zone, follow the county's Flood Damage Protection regulations⁶.

Check sewer availability and soil suitability before treating a parcel as buildable: only about 0.4% of county soil is rated without severe limitations for a conventional septic drain field¹⁰. Every well in St. Lucie County needs a permit from the Florida Department of Health in St. Lucie County, under a program delegated by the South Florida Water Management District⁵. Large-lot Residential Estate areas are not required to have central utilities, so confirm whether water and sewer reach the parcel⁶. Determine whether the home site falls in a Special Flood Hazard Area, because the county requires an Elevation Certificate at three stages for residential construction there¹⁷. Confirm legal access and driveway requirements with the Permitting/Zoning Division because we could not confirm the complete county driveway-permit rule¹⁵. For carrying costs, the median property-tax bill is about $2,893 a year, the effective property-tax rate is about 0.9%, and typical homeowners insurance is about $2,777 a year¹⁰.