ADU Rules & Zoning in St. Petersburg, Florida (2026)
What ADU can you build in your St. Petersburg backyard?
Instantly check eligibility for Accessory Dwelling Units (ADUs), like Guest Houses, Garage Conversions, and In-Law Suites.
Key Takeaways: St. Petersburg ADU Rules 2026
- Maximum ADU size is 800 sq ft OR 67% of primary dwelling floor area — whichever is smaller
- Check eligibility instantly using free GIS map at stpete.org before spending any money
- Owner-occupancy required — must live in primary home or ADU
- Short-term rentals under 30 days require separate city STR license in addition to state DBPR licensing
- Minimum setbacks: 3 ft side, 3 ft rear — among the smallest in Florida, enabling more lots to qualify
- South Side CRA grant available: up to 40% of construction costs for income-qualifying homeowners
- Historic district properties require additional review from City's Historic Preservation Office
St. Petersburg 2026 ADU Requirements Snapshot
Refreshed from newest archived St. Petersburg original DOCX extract (2026-03-06 upload). Verify latest LDR text and overlays with city Planning & Development Services before final budgeting.
ADU Size Calculator (67% formula, 800 sq ft cap)
| Primary Home Size | Max ADU Size |
|---|---|
| 1,200 sq ft | 800 sq ft |
| 1,800 sq ft | 800 sq ft |
| 1,200 sq ft (cap triggers) | 800 sq ft (max) |
Whichever is smaller: 67% of primary OR 800 sq ft hard cap.
What this means for your lot
- Use the address checker first to verify parcel-specific zoning.
- Confirm setbacks and lot geometry before spending on plans.
- Check short-term rental rules carefully — they vary significantly by city.
Key gotchas
- Not checking the free GIS eligibility map first — confirms eligibility instantly before any investment
- Missing the South Side CRA grant opportunity — up to 40% construction cost grant for qualifying homeowners
- STR requires 30-day minimum stay — cannot legally use Airbnb for nightly rentals
Building Limits
- Max Size:800 sq ft or 67% (lesser)
- Setbacks:3ft side / 3ft rear
- Detached Allowed?Yes
- Build Cost Est.:$90,000–$220,000 typical
- Min Rental Period:30 days
Rental Rules
Owner-Occupancy Required: You must live in either the primary home or the ADU.
Short-Term Rentals: Not prohibited at the city level. State DBPR license required.
Estimated Monthly Income
$1,500–$1,900/month
Based on 2025–2026 St. Petersburg market data
St. Petersburg ADU Permit Cost Breakdown
| Cost Item | Amount / Notes |
|---|---|
| Total Estimated Cost | $3,000–$8,000 |
| Building Permit Fee | Based on construction valuation — contact (727) 893-7231 |
| Plan Review | Included in permit fee |
| Impact Fees | Pinellas County impact fees apply — contact county for estimate |
| South Side CRA Grant | Up to 40% of construction costs grant for South Side CRA income-qualifying homeowners |
| STR License | Additional city STR license required for short-term rental operations (contact city for current fee) |
Key ADU Restrictions in St. Petersburg
- ADU max 800 sq ft or 67% of primary dwelling floor area — whichever is less
- Free online GIS eligibility map at stpete.org lets homeowners check eligibility instantly
- South Side CRA grant available — up to 40% of construction costs for income-qualifying homeowners
Common Mistakes to Avoid in St. Petersburg
- Not checking the free GIS eligibility map first — confirms eligibility instantly before any investment
- Missing the South Side CRA grant opportunity — up to 40% construction cost grant for qualifying homeowners
- STR requires 30-day minimum stay — cannot legally use Airbnb for nightly rentals
Eligible Zones in St. Petersburg
St. Petersburg ADU — Frequently Asked Questions
Can I build an ADU in St. Petersburg?
Yes. St. Petersburg permits ADUs by right in eligible residential districts including NTM-1, NSM-1, NSM-2, and NTM-COR zones. Use the free GIS eligibility map at stpete.org to confirm your parcel qualifies instantly — this is the fastest first step before any investment.
What is the maximum ADU size in St. Petersburg?
800 sq ft OR 67% of the primary dwelling's floor area — whichever is smaller. On a 1,000 sq ft home, your cap is 670 sq ft (67%). On a 1,200 sq ft or larger home, your cap is 800 sq ft (the hard ceiling). The compact 3 ft side and rear setbacks make ADUs feasible on most St. Pete lots.
Do I need to live on the property to build or rent an ADU in St. Petersburg?
Yes. St. Petersburg requires owner-occupancy — you must live in either the primary home or the ADU. This is verified during the permitting process.
Can I use my St. Petersburg ADU as an Airbnb?
Short-term rentals under 30 days require a separate city STR license in addition to the state DBPR Vacation Rental Dwelling license. The minimum stay without additional STR licensing is 30 days. Contact Planning at (727) 893-7231 to confirm current STR licensing requirements and fees.
Is there financial assistance available for ADU construction in St. Petersburg?
Yes. The South Side Community Redevelopment Area (CRA) offers a grant covering up to 40% of construction costs for income-qualifying homeowners in the South Side CRA area. Contact the City's CRA office through stpete.org to verify eligibility before breaking ground — this grant significantly reduces upfront costs.
St. Petersburg Planning Department
City of St. Petersburg Planning & Development Services
Nearby Cities — ADU Rules
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This page provides general information based on current ordinances and publicly available data as of March 2026. Zoning rules change — verify all requirements with your local planning department before making financial commitments.