Hialeah, FL Accessory Structures: ADU Rules (2026)
ADU rules in Hialeah, FL, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Min Lot
- 7,500 sq ft (RU-1)
- ADU Size
- 400-800 sq ft
- Garage Conv.
- 5,000 sq ft lot
- Owner Occ.
- Required
- HVHZ
- Hurricane code
Summary
Hialeah ADU regulations follow Miami-Dade County standards. ADUs permitted in qualifying zones inside the Urban Development Boundary. HVHZ building code applies. Owner occupancy required.
Miami-Dade County has approved an ordinance, allowing an accessory dwelling unit (ADU) or guesthouse in a single-family zoned district either as a newly detached or attached dwelling unit, including the conversion of a portion of an existing single-family dwelling. The County Code provides the following definitions: An ADU is an attached or detached accessory building, or portion thereof, that is used as an ancillary residential unit and is located on the same lot as the principal single-family dwelling. It has a separate kitchen, bathroom, and sleeping area, and it is intended for use by a separate family of occupants. [...] Complying with ADU Requirements: Use is limited to one ADU on the property, and the use must be ancillary. [...] ADU may be attached or detached. Renewable Certificate of Use. Only the owner of the property may obtain a CU for an ADU. One-time interior inspection, and exterior inspections for CU renewals. ADU can have a separate address, entrance, and/or separate utilities from the principal structure. If ADU is detached, the height of the structure cannot exceed the height of the principal structure. Setback requirements still apply for detached structures. An RV cannot be used as an ADU. [...] Certificate of Use (CU) Requirements: Zone: One accessory unit per lot shall be permitted in the following zoning districts located inside of the Urban Development Boundary: AU, EU, and RU, as well as GU for properties that are trended to AU, EU, or RU. Lot Size: Lot must be a minimum of 7,500 square feet. Accessory Dwelling Size: Must be between 400-800 Sq ft in RU-1 districts. Maximum Number of Accessory Units: One accessory unit is allowed on a lot developed with a principal single-family dwelling. [...] Overnight occupancy: maximum of two persons per bedroom, excluding children under 3 years of age. [...] Parking: Maximum of one additional parking space and not more than two vehicles; parking must be within the same property or in the adjacent swale.
Full Breakdown
ADUs in Hialeah follow Miami-Dade regulations. Permitted in AU, EU, RU zones inside UDB. RU-1: 7,500 sq ft lot, 400-800 sq ft ADU. Garage conversions: 5,000 sq ft lot, 220 sq ft min. One ADU per property. Owner occupancy required. HVHZ compliance mandatory. This adu rules rule under Hialeah's accessory structures ordinances applies to properties within Hialeah city limits. For current statutory text, amendments, enforcement procedures, fines, appeal options, and any exemptions that may apply to your situation, contact Hialeah code enforcement directly or consult the official Florida municipal code library. Ordinances change periodically; always verify with local staff before relying on summary information.
Violations & Fines
Unpermitted: stop-work. Non-compliant: demolition possible.
Frequently Asked Questions
Can I build an ADU in Hialeah?
Can I convert a garage?
Sources & Official References
Other rules in Hialeah
How Hialeah compares: Easiest Cities to Build an ADU·Florida rules heatmap·Compare Hialeah to another location·View the Florida accessory structures overview
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ADU Rules in Nearby Cities
How other cities in Miami-Dade County handle adu rules.