St. Johns County, FL Building Setbacks & Zoning: Lot Coverage Limits (2026)

Table 6.01 in Section 6.01.01 sets a Maximum Lot Coverage percentage for every zoning district in unincorporated St. Johns County, applied on top of, and separately from, a 70% Impervious Surface Ratio ceiling that also counts driveways, walkways, pools and other paved or roofed surfaces. The estate-lot RS-E district allows only 20% building coverage on a minimum one-acre lot with 150 feet of width. RS-2 permits 25% coverage on a minimum 13,200-square-foot, 90-foot-wide lot. RG-1 single-family lots reach 30% coverage on a 10,000-square-foot lot, and RG-2 single-family lots reach 35% coverage on a 7,500-square-foot lot. Multi-family and commercial districts carry their own separate coverage or Floor Area Ratio figures further down the same table.

A separate rule outside Table 6.01 caps Zero Lot Line residential development, permitted only inside Planned Unit Developments under Section 6.01.04, at 50% lot coverage for all buildings under Section 6.01.04.B.7.

Section 6.01.01 is one of the sections the Planning and Zoning Agency is authorized to grant a Zoning Variance from under Section 10.04.02(4), where literal enforcement would create unnecessary and undue hardship and the variance is not contrary to the public interest; the PZA may attach conditions to any coverage variance it grants, and a denied or granted request bars a new petition on the same property for one year. A lot platted before July 29, 1999 with recorded Building Restriction Lines follows those lines for yard requirements, though the district's coverage percentage in Table 6.01 still applies to it.