ADU Zoning in Hillsborough County, Florida (2026)
What ADU can you build in your Hillsborough County backyard?
Instant zoning report — see exactly what your zoning allows: permitted ADU types, size limits, setbacks, and lot requirements for your specific property.
Hillsborough County ADU — Key Facts
- Hillsborough County runs TWO programs: standard ADUs (750 sq ft cap) and Enhanced Family Residence (1,000 sq ft for family age 62+)
- City of Tampa, Temple Terrace, and Plant City are SEPARATE jurisdictions — different rules and permit portals
- Standard ADU: max 750 sq ft OR 50% of primary, whichever is less
- EFR ADU: max 1,000 sq ft but limited to qualifying family member age 62+; cannot be rented to non-family
- No owner-occupancy requirement for standard ADUs
- STR under 30 days prohibited in single-family residential zones
- Long-term rental income range: $1,300–$1,900/month in unincorporated Hillsborough
Unincorporated Hillsborough County Rules
*These rules apply if your address is NOT inside a specific city limit.
Hillsborough County ADU Permit Process
- 1Confirm unincorporated Hillsborough jurisdiction (not Tampa, Temple Terrace, or Plant City).
- 2Verify zoning district eligibility and any RSC overlay restrictions.
- 3Check FEMA flood zone status.
- 4Hire Florida-licensed PE or RA for sealed plans.
- 5Submit application via Hillsborough County Development Services portal.
- 6Multi-department plan review (zoning, building, fire, environmental).
- 7Respond to corrections; pass inspections.
- 8Obtain Certificate of Occupancy. Typical timeline: 6–12 months from design to CO.
Timeline: Plan review: 4–8 weeks. Total project: 6–12 months. EFR pathway adds 2–4 weeks for family qualification documentation.
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Hillsborough County ADU — Frequently Asked Questions
The most common questions from Hillsborough County homeowners about ADU rules, permits, and costs.
Can I build an ADU in Hillsborough County?
Yes, if your property is in unincorporated Hillsborough County. The county permits standard ADUs (up to 750 sq ft) and Enhanced Family Residences (up to 1,000 sq ft for family age 62+) in RSC-1 through RSC-12 and several agricultural residential zones. If your address is inside the City of Tampa, Temple Terrace, or Plant City, separate rules apply — verify jurisdiction first.
What's the difference between a standard ADU and an Enhanced Family Residence in Hillsborough?
Standard ADUs are limited to 750 sq ft OR 50% of the primary dwelling (whichever is less) and may be rented to any tenant. Enhanced Family Residences (EFR) may be up to 1,000 sq ft but must be occupied by a qualifying family member age 62+ (parent, grandparent) and cannot be rented to non-family. EFR is a distinctive Hillsborough program designed for multigenerational housing.
Do I need to live on my Hillsborough County property to build an ADU?
Not for standard ADUs — The county's land development code does not impose an owner-occupancy mandate for standard ADUs. You may rent both the primary home and the standard ADU to separate tenants. EFR units, however, must be occupied by a qualifying family member age 62+ and cannot be rented to third parties.
Can I rent my Hillsborough County ADU on Airbnb?
No. Short-term rentals (under 30 days) are prohibited in single-family residential zones in unincorporated Hillsborough County. Plan around long-term rentals only. Long-term ADU rents typically run $1,300–$1,900/month.
How do I know if my address is in unincorporated Hillsborough or the City of Tampa?
Use the Hillsborough County Property Appraiser website (hcpafl.org) to look up your parcel. The 'Tax District' field will indicate whether you're in unincorporated county or inside the City of Tampa, Temple Terrace, or Plant City. Different jurisdictions use different ADU rules, permit portals, and fee schedules.
No specific city data loaded yet for Hillsborough County.
Check the unincorporated rules above.
City of Tampa vs. Unincorporated Hillsborough: Which Rules Apply to Your Parcel?
A “Tampa” mailing address does not mean City of Tampa zoning. Many homes with a Tampa address actually sit in unincorporated Hillsborough County, and the two govern accessory dwelling units differently. The first thing to settle is which jurisdiction your parcel falls under, because it changes what you are allowed to build.
Inside the City of Tampa
- Rentable ADUs are permitted only in four designated overlay areas: Seminole Heights, the area around Lowry Park, the East Tampa overlay, and the Tampa Heights overlay.
- Outside those overlays, a second unit is allowed only as an Extended Family Residence — occupied by family, not rented on the open market.
- The main residence must be owner-occupied.
- Each overlay carries its own neighborhood standards — the city publishes separate rules for East Tampa, Seminole Heights, and Tampa Heights.
Unincorporated Hillsborough County
- ADUs are allowed in single-family residential zoning districts, subject to a minimum lot size and owner-occupancy.
- An Extended Family Residence option exists for housing relatives.
- Size caps and lot thresholds are set by the county Land Development Code and vary by zoning district — they are not the same as the City of Tampa’s.
The city/county line runs mid-neighborhood in places like Seminole Heights and Town ’N’ Country, and the ADU overlay boundaries follow specific parcels, not whole ZIP codes. Two houses on the same street can get different answers. The only way to know which rules govern your lot, and whether it sits inside a Tampa ADU overlay, is to check the parcel itself.
Source: City of Tampa — Accessory Dwelling Units. Verify your parcel’s jurisdiction and overlay status with the free check above before planning.
Read the Complete Tampa ADU Guide
City vs. County jurisdiction explained, EFR distinction, permit steps, real costs ($150K–$280K), and ROI.
Florida ADU Laws 2026 — What State Law Does and Doesn't Do
How §163.31771 works, and what your local government controls.
Find out what ADU you can build in your backyard
— and get a free Hillsborough County ADU guide for your area.
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