Pinellas County, FL Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Max ISR, R-1 district
- 0.75 of net lot area (residential)
- R-1 minimum lot size
- 9,500 square feet
- Comparison: large-lot districts
- 0.60 ISR on 2-acre minimum lots
- Variance available?
- No, excluded by § 138-235(b)(6)
- Maximum fine
- Up to $1,000 per day, § 138-54(7)
- Scope
- Unincorporated Pinellas County only
Summary
In unincorporated Pinellas County's R-1 Single-Family Residential District, Code § 138-368.1 caps the impervious surface ratio at 0.75 of net lot area for residential development. That means roofs, driveways, pools, patios and every other hard surface on a 9,500-square-foot R-1 lot cannot together exceed roughly 7,125 square feet, and the limit cannot be varied away.
3. These development parameters may be superseded by other requirements as part of an adopted development master plan and/or conditional overlay. 4. For new residential subdivisions only, Single-Family Detached Zero Lot Line dwellings may be constructed with a 0-foot setback on one side yard; whereas, the opposite side yard shall be at least 10 feet. 5. The maximum impervious surface ratio (ISR) is 0.75 for residential uses. For nonresidential uses, see the underlying future land use category.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 124).
Full Breakdown
The county's Land Development Code defines "impervious surface ratio (ISR)" at § 138-1 as the relationship between total impervious surface area and net land area, calculated by dividing the square footage of impervious surfaces by the square footage of net land area. 75 ISR ceiling for residential uses; nonresidential uses instead follow the underlying future land use category. Note 3 to the same table warns that these development parameters, ISR included, "may be superseded by other requirements as part of an adopted development master plan and/or conditional overlay," so a property inside a CO or PUD may face a different number.
60, reflecting the tradeoff between lot size and allowed coverage. Section 138-9(3) makes the cap enforceable directly: no structure may be erected, altered, enlarged, or have its surrounding open space "encroached upon or reduced in any manner" except in conformity with the area, parking and setback regulations set for the district. 75 cap the way they could for a setback or fence-height variance.
Violations & Fines
Pinellas County code enforcement inspectors investigate ISR complaints and site plans under § 138-54; where construction is under way, the county building department can issue a stop-work order until the excess coverage is corrected. Anyone who violates the zoning code, including the R-1 development parameters, "shall be deemed guilty of an infraction of a county ordinance" punishable by a fine up to $1,000.00 under § 138-54(7), with each day the violation continues counted as a separate offense; the property owner is responsible even if a contractor did the work.
Frequently Asked Questions
Does the 0.75 impervious surface cap apply inside St. Petersburg or Clearwater?
Can I get a variance to exceed the 0.75 ISR limit?
What counts toward impervious surface on my lot?
What happens if my ISR runs over 0.75?
Sources & Official References
Other rules in Pinellas County
Florida rules heatmap·Compare Pinellas County to another location·View the Florida building setbacks & zoning overview
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