ADU Rules & Zoning in St Petersburg, Florida (2026)
What ADU can you build in your St Petersburg backyard?
Instant zoning report — see exactly what your zoning allows: permitted ADU types, size limits, setbacks, and lot requirements for your specific property.
ADU Rules in St Petersburg, Florida
We've researched St Petersburg's ADU rules so you don't have to. Here's what matters most — the facts that determine whether your project is possible, and how much it will cost.
- 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
Last verified: 2026-03-06
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Backyard ADUs like this are being built across St Petersburg — here's how to do it right.
Here's exactly what St Petersburg zoning allows
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.
Zoning allowance
St. Petersburg permits ADUs by-right in eligible districts when standards are met, and provides a GIS eligibility tool for parcel pre-checks. City expansions (including 2022 updates) broadened eligibility across multiple neighborhood districts.
Size limits
ADU size is commonly constrained to up to 800 sq ft and up to 67% of the principal dwelling floor area (as summarized in the source guide).
Lot + setbacks
Detached, attached, interior-conversion, and above-garage ADU forms are possible, but each must satisfy district setbacks, lot coverage, and any historic-design constraints. Front-yard detached placement is generally disfavored.
Height + coverage
Height allowances follow district form standards; above-garage/upper-story ADUs can be feasible where district limits allow. Combined lot/impervious coverage for all structures must remain compliant.
Parking
St. Petersburg includes transit-proximate flexibility, including exemptions near high-frequency transit in qualifying contexts. Outside those contexts, off-street parking feasibility is evaluated during permitting.
Rental / occupancy
Short-term rental activity is constrained by city rules; the source guide references a 30-day minimum framework with limited exceptions. Confirm current STR enforcement posture and owner-occupancy applicability for the parcel/use model.
Permit process
Typical path: GIS + zoning pre-check -> code-compliant plan set -> building permit -> inspections -> CO. Historic district parcels may require additional design/certificate approvals.
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.
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Building limits and rental rules, side by side
These two sets of rules determine what you can build and what income you can expect. Read both before you commit to a design or a rental strategy.
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
Here's exactly what you'll pay — and how to avoid the fees that catch most homeowners off guard
Most homeowners spend 3–4 weeks piecing this together on their own. We've mapped the full St Petersburg permit process step by step — so you know exactly what's coming, and what to prepare.
Step 1: Pre-Application Zoning Check
- Where:
- City of St. Petersburg Planning & Development Services, 1 4th St. N., St. Petersburg, FL 33701
- Contact:
- (727) 893-7231
- What to bring:
- Property address and parcel ID, preliminary site sketch, lot survey
- Timeline:
- No appointment fee — call ahead to confirm office hours
- Cost:
- No fee for initial inquiry
Step 2: Submit Permit Application
- Where:
- https://stpete.org
- Contact:
- (727) 893-7231
- What to bring:
- Architectural plans, site plan, boundary survey, energy compliance docs
- Timeline:
- GIS eligibility check: immediate (free online at stpete
- Cost:
- $3,000–$8,000
Step 3: Plan Review & Revisions
- Where:
- City of St. Petersburg Planning & Development Services
- Contact:
- (727) 893-7231
- What to bring:
- Responses to any correction letters; revised drawings if required
- Timeline:
- GIS eligibility check: immediate (free online at stpete.org). Permit review: 4–8 weeks. Total typical: 5–10 months. Historic district: add 4–8 weeks for Certificate of Appropriateness.
- Cost:
- No additional fee for standard resubmittal
Step 4: Construction & Inspections
- Where:
- St Petersburg Building Department
- Contact:
- (727) 893-7231
- What to bring:
- Approved permit set must be on-site at all times during construction
- Timeline:
- Schedule inspections as each phase of work is completed
- Cost:
- Included in permit fee
Full St Petersburg Permit Cost Breakdown
These are the fees you'll encounter, in the order you'll typically encounter them.
| 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) |
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Key ADU Restrictions in St Petersburg
These are the rules that most often catch homeowners by surprise. Read them carefully before engaging an architect.
- 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
ADUs are permitted by-right in these zoning districts. Verify your parcel at the county GIS portal — most homeowners can confirm their zone in under 5 minutes.
St Petersburg neighborhoods where ADU permits are being filed — is your street next?
St Petersburg ADU — Frequently Asked Questions
These are the questions we hear most often from St Petersburg homeowners. If yours isn't here, our ADU Zoning Experts can answer it directly.
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.
Find out what ADU you can build in your backyard
— and get a free St Petersburg ADU guide for your area.
Free report · No commitment · 60 seconds
Find out what ADU you can build in your backyard
— and get a free St Petersburg ADU guide for your area.
Free report · No commitment · 60 seconds
St Petersburg Planning Department
We recommend calling City of St. Petersburg Planning & Development Services at (727) 893-7231 before submitting anything — a 10-minute conversation can save weeks of back-and-forth on your permit application.
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.