Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Miami, FL? Call AccessoryDwellingUnit Services 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 involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.

About this service

When estimating the cost to build, consider the difference between a prefab unit and custom construction, as well as site preparation requirements like clearing trees or grading land. Labor and material prices also play a significant role. We provide an exact pricing confirmed free on the call.

Frequently asked in Miami

What are the disadvantages of ADUs?

When planning an ADU in Miami, consider the initial construction costs, which can be higher due to building codes and materials. You'll also want to evaluate the impact on your yard space and privacy. Discussing these with a local pro will help you make informed decisions.

How much does an ADU cost in Florida?

What are the rules for ADUs in Florida?

ADU regulations in Florida can differ by county and city. Miami has specific zoning ordinances and building codes that must be followed. A local ADU specialist can provide you with the precise requirements for your project in Miami.

Is ADU allowed in Maryland?

That grant program is specific to California. For any potential ADU grants or incentives available in Miami, Florida, it's best to consult with local experts who are familiar with programs relevant to your region.

What are the rules for ADU in California?

California has its own ADU laws, which are separate from those in Florida. When planning an ADU in Miami, you must adhere to Miami's specific zoning and building codes. A local professional is your best resource for this information.

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

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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: South Beach, Coral Gables, Brickell, Wynwood, Coconut Grove — and every surrounding area.