Cost to build accessory dwelling unit

Looking for cost to build accessory dwelling unit in Miami, FL? Call AccessoryDwellingUnit Solutions 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 budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

When calculating the budget for a secondary unit, consider the costs for architectural design, permits, materials, and labor. Custom designs and high-end interior finishes will push your budget higher, while standardized layouts can keep costs more predictable. Exact pricing confirmed free on the call.

Frequently asked in Miami

What are the disadvantages of ADUs?

Potential disadvantages of ADUs can include reduced yard space and increased utility costs, especially in a warm climate like Miami. Neighborhood concerns about density or parking may also arise. Understanding these factors with expert guidance is crucial for a successful ADU project.

How much does an ADU cost in Florida?

The cost to build an ADU in Florida, including Miami, varies significantly. It depends on factors like size, design complexity, materials suited for the climate, and site preparation needs. Utility connections and permit fees are also important cost components. A personalized quote from a local professional will provide the most accurate estimate.

What are the rules for ADUs in Florida?

Is an ADU allowed in Florida?

Yes, ADUs are allowed in many areas of Florida, including Miami, subject to local zoning and building code compliance. The feasibility depends on your property's characteristics and adherence to the city's development standards. A professional assessment will confirm the specific requirements for your lot.

What are the rules for ADU in Florida?

Rules for ADUs in Florida often address the size and placement of the accessory unit relative to the primary dwelling. You'll also need to consider parking provisions, utility access, and design compatibility with the tropical environment. Consulting with local experts ensures your Miami ADU project meets all necessary legal and safety standards.

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