ADU Rules & Zoning in Pinellas County, Florida (2026)
What ADU can you build in your Pinellas County 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 Pinellas County, Florida
We've researched Pinellas County'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.
- Only applies to unincorporated Pinellas County — incorporated cities (St. Pete, Clearwater, Largo) use separate rules
- Maximum ADU size is 1,000 sq ft standard; reduced to 750 sq ft in Coastal Storm Areas and FEMA flood zones
- Development review fees WAIVED as of July 2024 — significant cost saving versus other permit types
- Owner-occupancy required unless affordable housing exception (both units rented at ≤80% AMI with 20-year agreement)
- Short-term rentals require Certificate of Use — $450 initial + $150 inspection + $450 annual renewal — actively enforced
- Multigenerational ADU property tax reduction available for ADUs housing parents/grandparents age 62+ (July 2024)
- ADU exterior must match primary home's finish, roof style, materials, and colors
Last verified: 2026-03-02
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Backyard ADUs like this are being built across Pinellas County — here's how to do it right.
Here's exactly what Pinellas County zoning allows
This guide is for unincorporated Pinellas County; incorporated cities in Pinellas use separate rules and permitting offices.
Zoning allowance
ADUs permitted in eligible districts: R-A, R-E, R-R, R-1, R-2, R-3, RMH, R-4, R-5, RM, and RPD zones. Applies to unincorporated Pinellas County only — incorporated cities (St. Petersburg, Clearwater, etc.) use separate rules.
Size limits
Maximum 1,000 sq ft (750 sq ft in FEMA flood zones). Type 2 review allows up to 20% over the maximum; Board variance required for larger exceptions. Development review fees waived as of July 2024.
Lot + setbacks
Rear: Max Height R-A SF + agriculture, livestock 2 acres 90 ft 25 ft / 15 ft (porch) 15 ft / 20 ft (street) 20 ft 35 ft R-E SF + agriculture, livestock 32,000 sf 90 ft 25 ft / 15 ft (porch) 15 ft / 20 ft (street) 20 ft 35 ft R-R SF + agriculture, livestock 16,000 sf 90 ft 25 ft / 15 ft (porch) 10 ft
Height + coverage
Height: Unknown; Coverage: . Verify with BDRS or in Chapter 138 for your specific district. Flood Zone Note Pinellas County is heavily mapped with FEMA flood zones (AE, VE, X). In Coastal Storm Areas and certain flood zones, the ADU size cap remains 750 sq ft. Check your flood zone at msc.fema.gov o
Parking
Parking requirements follow district standards. Verify current stall count and design requirements with Pinellas County Development Review Services.
Rental / occupancy
Owner occupancy: (Affordable Housing) Owner must occupy primary home or ADU Waived for affordable housing: owner may rent both units at 80% AMI or below, with 20-year Land Use Restrictive Agreement Detached ADU Height No taller than primary home No taller than primary home (unchanged) Garages/Storag
Permit process
1. Confirm unincorporated Pinellas County jurisdiction (not an incorporated city). 2. Verify zoning district eligibility (R-A through RPD). 3. Check flood zone status (affects size limit). 4. Hire a Florida-licensed design professional. 5. Submit permit application (development review fees waived as of July 2024). 6. Complete plan review. 7. Build and pass inspections. 8. Obtain Certificate of Occ
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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:1,000 sq ft
- Setbacks:20ft front / 6ft side / 10ft rear
- Detached Allowed?Yes
- Max Height:35 ft
- Build Cost Est.:$100,000–$250,000 typical
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
$1,400–$1,900/month
Based on 2025–2026 Pinellas County market data
ADUs are NOT Permitted In:
- Incorporated cities within Pinellas County (St. Petersburg, Clearwater, Largo, Dunedin, etc.) — each uses separate city rules and permitting offices
- Coastal Storm Areas — 750 sq ft maximum applies instead of standard 1,000 sq ft
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 Pinellas County permit process step by step — so you know exactly what's coming, and what to prepare.
Step 1: Pre-Application Zoning Check
- Where:
- Pinellas County Development Review Services (BDRS), 440 Court St., Clearwater, FL 33756
- Contact:
- (727) 464-3888 · drs-help@pinellas.gov
- 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://aca-prod.accela.com/pinellas
- Contact:
- (727) 464-3888
- What to bring:
- Architectural plans, site plan, boundary survey, energy compliance docs
- Timeline:
- Development review fees waived streamlines process
- Cost:
- Development review fees WAIVED as of July 2024
Step 3: Plan Review & Revisions
- Where:
- Pinellas County Development Review Services (BDRS)
- Contact:
- (727) 464-3888
- What to bring:
- Responses to any correction letters; revised drawings if required
- Timeline:
- Development review fees waived streamlines process. Permit review: 3–6 weeks. Total typical: 4–10 months
- Cost:
- No additional fee for standard resubmittal
Step 4: Construction & Inspections
- Where:
- Pinellas County Building Department
- Contact:
- (727) 464-3888
- 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 Pinellas County 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 | Development review fees WAIVED as of July 2024 |
| Development Review Fee | WAIVED — $0 (waived effective July 2024) |
| Building Permit Fee | Building permit fee based on construction valuation — contact (727) 464-3888 |
| STR Certificate of Use | $450 initial + $150 inspection + $450 annual renewal |
| Multigenerational Tax Reduction | Up to 20% of assessed value reduction if ADU houses parent/grandparent age 62+ — apply at pcpao.gov |
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Key ADU Restrictions in Pinellas County
These are the rules that most often catch homeowners by surprise. Read them carefully before engaging an architect.
- Max 1,000 sq ft (750 sq ft in Coastal Storm Areas and FEMA flood zones)
- STR requires Certificate of Use ($450 initial + $150 inspection, $450 annual renewal) — active enforcement
- Owner must occupy either primary home or ADU unless affordable housing exception applies
Common Mistakes to Avoid in Pinellas County
- Not verifying jurisdiction first — most Pinellas land is inside incorporated cities with different rules
- Ignoring Coastal Storm Area size cap — ADU limited to 750 sq ft, not 1,000 sq ft, in flood zones
- Renting short-term without Certificate of Use — daily fines, actively enforced via (727) 353-2436 hotline
Eligible Zones in Pinellas County
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.
Pinellas County neighborhoods where ADU permits are being filed — is your street next?
Pinellas County ADU — Frequently Asked Questions
These are the questions we hear most often from Pinellas County homeowners. If yours isn't here, our ADU Zoning Experts can answer it directly.
Can I build an ADU in Pinellas County?
Yes, if your property is in unincorporated Pinellas County (not inside an incorporated city). All residential districts qualify: R-A, R-E, R-R, R-1, R-2, R-3, RMH, R-4, R-5, RM, and RPD. Verify your jurisdiction using the Pinellas County Zoning & Land Use Map at pinellas.gov/zoning-land-use. Incorporated cities like St. Petersburg, Clearwater, and Largo have separate rules.
What is the maximum ADU size in unincorporated Pinellas County?
1,000 sq ft standard. In Coastal Storm Areas and FEMA flood hazard areas, the limit is 750 sq ft. Check your flood zone at msc.fema.gov. The ADU must also match the exterior finish and roof style of the primary home.
Do I need to live on the property to build or rent an ADU in Pinellas County?
Yes, unless you qualify for the affordable housing exception. Standard: owner must occupy either the primary home or ADU (verified via Homestead Exemption). Exception: both units can be rented at or below 80% Area Median Income with a 20-year Land Use Restrictive Agreement recorded on the property.
Can I use my Pinellas County ADU as an Airbnb?
Short-term rentals are not prohibited, but require a Certificate of Use ($450 initial + $150 inspection + $450 annual renewal) before operating. Enforcement is active — violations reported via (727) 353-2436 hotline. Register and renew annually to avoid daily fines.
Are there special tax benefits for ADUs in Pinellas County?
Yes. As of July 2024, homeowners who build or renovate an ADU to house a parent or grandparent age 62+ may qualify for a property tax reduction equal to the lesser of the assessed value increase or 20% of total assessed value after improvements. Apply with the Pinellas County Property Appraiser at pcpao.gov or (727) 464-3207.
Find out what ADU you can build in your backyard
— and get a free Pinellas County 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 Pinellas County ADU guide for your area.
Free report · No commitment · 60 seconds
Pinellas County Planning Department
We recommend calling Pinellas County Development Review Services (BDRS) at (727) 464-3888 before submitting anything — a 10-minute conversation can save weeks of back-and-forth on your permit application.
Pinellas County Development Review Services (BDRS)
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.