ADU Construction in Miami, FL
Accessory dwelling units, garage conversions and in-law suites in Miami, FL: tell us the job once and we connect you with a contractor for it. Accessory dwelling units built to code - detached builds, garage conversions and basement suites - from feasibility and zoning through final occupancy. Most housing units in Miami are not detached houses: 61% are in buildings of five or more units and only 22% are detached single-family homes.
- Written scope before work starts
- No obligation on quotes
- Local permit knowledge
- Clear change-order process
ADU Construction cost in Miami
Typical Miami range: $85,000 - $310,000 per unit. Reflects Florida labor and material costs. Estimate for planning, not a quote - call (844) 624-3161 for a written scope.
An ADU is a zoning project before it is a construction project. Setbacks, lot coverage, parking relief, owner-occupancy rules and utility capacity decide what can legally go on your lot, and they vary street by street.
Long cooling seasons and heavy summer rain drive the two problems we see most here: moisture getting into assemblies, and anything that traps it staying wet.
Utilities are the line item that surprises people: whether your existing panel and sewer lateral can carry a second dwelling, or whether you are trenching to the main.
What the job includes
- Zoning and feasibility review
- Plan sets and permit submittal
- Detached, attached and garage conversions
- Separate utility metering
- Kitchen and bath rough-in
- Final inspection and occupancy sign-off
Homes in Miami and adu construction work
Public figures for the city of Miami in Miami-Dade County, not the metro, and the general practice that follows.
Most housing units in Miami are not detached houses: 61% are in buildings of five or more units and only 22% are detached single-family homes.1 With most units in multi-family buildings, ADU demand comes from the minority of detached lots; feasibility review is the first paid step, before any design. Building permits in Miami are normally issued by the city building department.2,3 ADU plan review and permits go through the city building department; the contractor prepares the plan set and submits it.
Renters are the clear majority in Miami: only 31% of occupied homes are owner-occupied (68% statewide).1 Where most occupied homes are rented, ADU inquiries often come from owners of rental property; the feasibility review is the same. About 51% of Miami's housing units were built before 1980, close to the national share, and 19% since 2010.1 Newer subdivisions often carry HOA covenants that affect ADUs separately from zoning - check the CC&Rs before design spend.
Miami sits in IECC climate zone 1A (Hot-Humid).4 In a hot, humid climate zone the ADU's cooling and moisture design is the main energy-code item. The median owner-occupied home in Miami is valued at $518,100 (ACS), above the Florida median of $359,000.1 Home values above the state median tend to support fuller scopes; the written scope should still separate must-do from nice-to-have.
Cooling dominates the year: about 4,656 cooling degree days against 104 heating degree days (base 65°F).5,6 In a cooling-led climate, attic ventilation, duct sealing and window solar gain are where the energy code concentrates.
| Before 1940 | 7.8% |
|---|---|
| 1940-1959 | 22.1% |
| 1960-1979 | 21% |
| 1980-1999 | 12.8% |
| 2000-2009 | 17.2% |
| 2010 or later | 19.2% |
Sources and notes (6)
- U.S. Census Bureau, American Community Survey 5-year estimates (ACS 2020-2024 5-year (released 2026-01))
- U.S. Census Bureau population estimates (Vintage 2024)
- U.S. Census Bureau geographic code files (2020)
- Guide to Determining Climate Zones by County: Building America and IECC 2021 Updates (PNNL-33270) (September 2022 (IECC 2021 county map))
- NOAA NCEI U.S. Climate Normals, nearest station (1991-2020 normals (published 2021))
- NOAA NCEI normals station inventory (1991-2020)
- Climate figures are for NOAA station Miami Intl Ap, 6.8 miles from the place center; housing figures are ACS ACS 2020-2024 5-year with 90% margins of error in the source tables.
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Miami and nearby
Requests for Miami go through our national line, (844) 624-3161; we confirm whether a contractor can take the job. How a referral works.
ADU Construction nearby
Straight-line distances between place centers, not drive times. All ADU Construction in Florida
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Open Miami, FL in Google MapsADU Construction questions in Miami
How much does adu construction cost in Miami, FL?
Most adu construction projects in Miami, FL land between $85,000 and $310,000, depending on scope, access and material grade. That is an estimated range for planning, not a quote - call (844) 624-3161 and we will scope your job properly.
Can I legally build an ADU on my lot?
That depends on your zoning, setbacks, lot coverage and utility capacity. Feasibility review comes first, before any design spend.
What kind of housing does Miami have?
Most housing units in Miami are not detached houses: 61% are in buildings of five or more units and only 22% are detached single-family homes. Renters are the clear majority in Miami: only 31% of occupied homes are owner-occupied (68% statewide). Census figures for the place itself, not the metro.
Who issues building permits in Miami?
Building permits in Miami are normally issued by the city building department. Whether a specific job needs one is decided by that office; the contractor confirms it before work starts.
Other services in Miami
Get a free Miami ADU Construction quote
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