ADU Rules & Zoning in Siesta Key, Florida (2026)
What ADU can you build in your Siesta Key backyard?
Instantly check eligibility for Accessory Dwelling Units (ADUs), like Guest Houses, Garage Conversions, and In-Law Suites.
Siesta Key 2026 ADU Requirements Snapshot
Siesta Key ADU rules — governed by Sarasota County (unincorporated). Same rules as Sarasota County: 500 sq ft cap, owner-occupancy required, 30-day STR minimum. Premium beach rental market.
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
- Sarasota County's 500 sq ft ADU cap is restrictive — confirm current enforcement under Florida SB-48 before designing
- Siesta Key island construction carries a significant premium — limited contractor access and coastal requirements add 30–50% vs. mainland Sarasota
- STR ban under 30 days is aggressively enforced in Sarasota County — do not plan Airbnb income from a county-governed Siesta Key property
Building Limits
- Max Size:500 sq ft
- Setbacks:3ft side / 10ft rear
- Detached Allowed?Yes
- Max Height:35 ft
- Build Cost Est.:$150,000–$350,000
- Min Rental Period:30 days
Rental Rules
Owner-Occupancy Required: You must live in either the primary home or the ADU.
Short-Term Rentals Prohibited: Minimum 30-day stay required in Siesta Key.
Estimated Monthly Income
$2,000–$4,000/month
Based on 2025–2026 Siesta Key market data
Key ADU Restrictions in Siesta Key
- Sarasota County caps ADUs at 500 sq ft — significantly below the SB-48 1,000 sq ft statewide minimum; confirm county's current position under SB-48
- Owner-occupancy required under Sarasota County rules — you must live in the primary home or the ADU
- Short-term rentals under 30 days banned in Sarasota County single-family residential zones — long-term only
Common Mistakes to Avoid in Siesta Key
- Sarasota County's 500 sq ft ADU cap is restrictive — confirm current enforcement under Florida SB-48 before designing
- Siesta Key island construction carries a significant premium — limited contractor access and coastal requirements add 30–50% vs. mainland Sarasota
- STR ban under 30 days is aggressively enforced in Sarasota County — do not plan Airbnb income from a county-governed Siesta Key property
Eligible Zones in Siesta Key
Siesta Key ADU — Frequently Asked Questions
Can I build an ADU in Siesta Key, Florida?
ADUs governed by Sarasota County unincorporated rules. Permitted in RSF and RE residential zones subject to county ADU standards.
What is the maximum ADU size in Siesta Key?
Sarasota County caps ADUs at 500 sq ft with owner-occupancy required. Note: SB-48 may require allowing up to 1,000 sq ft — confirm current county position with planning.
Do I need to be an owner-occupant to build an ADU in Siesta Key?
Siesta Key requires owner-occupancy — you must live in either the primary home or the ADU.
Can I use my Siesta Key ADU as an Airbnb?
Short-term rentals under 30 days are prohibited in Siesta Key. The minimum rental period is 30 days.
How do I get an ADU permit in Siesta Key?
Permits through Sarasota County Building Services. Full inspection process.
Siesta Key Planning Department
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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.