Accessory dwelling unit construction cost

Looking for accessory dwelling unit construction cost in Miami, FL? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Miami and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Building costs vary based on the size of the unit, the quality of finishes, the complexity of the site foundation, and utility connections. You should consider these expenses when budgeting for a long-term property investment or home expansion. Exact pricing confirmed free on the call.

Frequently asked in Miami

What are the disadvantages of ADUs in Miami?

How much does an ADU cost in Florida?

The cost of an ADU in Miami varies significantly based on size, design, and site conditions. A basic garage conversion will differ from new construction. Factors like foundation work, plumbing, and electrical hookups are major cost drivers. Get a specific quote for your Florida property.

What are the rules for ADUs in Miami?

Is an ADU allowed in Florida?

Yes, accessory dwelling units are allowed in many Florida cities, including Miami, under specific local zoning and building codes. The state encourages ADU development to increase housing supply. Confirming your property's zoning is essential. We'll help find pros to assess your Miami location.

What is the process for building an ADU in Miami?

Building an ADU involves design, obtaining necessary permits from the city, construction, and final inspections. You must comply with Miami's building and zoning codes. Working with experienced professionals streamlines this process. We provide access to licensed builders familiar with the local procedures.

How do I find ADU contractors in Miami?

Also serving nearby: Hialeah · Miami Gardens · Miramar · Hollywood · Pembroke Pines

All cities in Florida →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

455,924residents

12,665per sq mile

8ZIP codes served

Serving all of Miami — population 455,924; about 12,665 residents per square mile across 36.0 sq mi. ZIP codes covered include 33101, 33102, 33106, 33111, 33112, 33116, 33122, 33124.

Neighborhoods served in Miami: Coral Gables, Little Havana, Brickell, Wynwood, Coconut Grove, South Beach — and every surrounding area.