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Miami ADU questions, answered
Each guide gives the short answer first, then the details, the cases where it depends and the sources. Rules are dated because Florida ADU law keeps moving.
Updated October 2026
How much does an ADU cost in Miami?
Published 2026 estimates, and what hurricane code and flood elevation add.
Read the guideCan I build an ADU on my lot in Miami?
Which government reviews your lot, and the lot and size rules that decide it.
Read the guideCan I rent my ADU on Airbnb in Miami?
County and city limits on short stays, and what state law says.
Read the guideWhat hurricane code applies to an ADU in Miami?
The High-Velocity Hurricane Zone and approved windows, doors and roofs.
Read the guideHow does a flood zone affect an ADU in Miami?
Floor elevation, garage slabs and the 50 percent rule.
Read the guideCan I legalize an existing efficiency in Miami-Dade?
The county path to permit a unit that was built without one.
Read the guideCheck what your lot allows
Guides explain the general rules. For your address, send us the details and we check zoning, flood zone and permits.