What Is an ADU (Accessory Dwelling Unit) in South Florida?

An accessory dwelling unit, or ADU, is a self-contained second home on a property — and across South Florida, ADUs have become one of the most sought-after ways to add rental income, house family, or expand a property's value. Whether you are considering a backyard cottage in Coral Gables, a garage-to-ADU conversion in Kendall, or an attached suite in Boca Raton, an ADU is a significant, rewarding project. At Endless Life Design, a licensed general contractor serving Miami-Dade, Broward, and Palm Beach, we design and build ADUs from the ground up. Call (305) 680-3283. Here is what you need to know.

Index

1. What an ADU (Accessory Dwelling Unit) Is

2. Types of ADUs

3. Why ADUs Are in Demand in South Florida

4. ADU Uses: Rental Income and Multi-Generational Living

5. Building an ADU vs. Converting a Garage

6. ADU Rules, Zoning, and the Florida Building Code

7. What an ADU Costs

8. The ADU Construction Process

9. Choosing an ADU Builder

10. How Endless Life Design Builds ADUs

1. What an ADU (Accessory Dwelling Unit) Is

An accessory dwelling unit (ADU) is a smaller, independent residential unit located on the same lot as a primary home. Sometimes called a granny flat, in-law suite, backyard cottage, or casita, an ADU has its own kitchen, bathroom, and living space, and typically its own entrance — making it a complete, self-contained living space rather than just an extra room.

What distinguishes an ADU from a simple home addition is that independence: it can function as a standalone home. That makes ADUs uniquely versatile, whether for housing family, generating rental income, or adding flexible space — and it is exactly why demand has grown so sharply across South Florida.

2. Types of ADUs

ADUs come in several forms. A detached ADU is a separate structure, such as a backyard cottage. An attached ADU shares a wall with the main home but has its own entrance. A garage conversion ADU transforms an existing garage into a living unit, and an interior ADU carves independent quarters out of existing space within the home.

Each type suits different lots, budgets, and goals. A detached cottage offers the most privacy and flexibility, while a garage conversion is often the most affordable path. From a Plantation backyard to a South Miami garage, we help homeowners choose the ADU type that fits their property and objectives.

3. Why ADUs Are in Demand in South Florida

ADUs have surged in popularity across South Florida for several reasons. Housing costs and a tight rental market make an income-producing unit attractive, while multi-generational living — common across the region's diverse communities — creates demand for private, independent space for family members.

ADUs also add meaningful value to a property and make efficient use of land in established neighborhoods. From Miami to Davie to Wellington, homeowners are recognizing that an ADU can pay for itself over time while adding lasting flexibility and value to their property.

4. ADU Uses: Rental Income and Multi-Generational Living

The two most common uses for an ADU are rental income and housing family. As a rental, an ADU can generate steady monthly income that offsets a mortgage or funds the investment itself. As family space, it offers aging parents or adult children a private, independent place to live while staying close.

Many homeowners value the flexibility to shift between uses over time — renting it today, housing a relative tomorrow, or using it as a home office or guest suite. In communities from Coral Gables to Sunrise to Jupiter, that adaptability is a large part of an ADU's appeal.

5. Building an ADU vs. Converting a Garage

There are two main paths to an ADU: building a new structure or converting existing space, most often a garage. A garage-to-ADU conversion is typically faster and more affordable because the structure already exists, while a new detached ADU offers full control over size, layout, and design.

The right choice depends on your lot, budget, and goals. Our guide to garage conversions covers the conversion path in detail, and we build new ADUs from the ground up as well. We help homeowners weigh the options to find the most cost-effective route to the unit they want.

6. ADU Rules, Zoning, and the Florida Building Code

ADUs are governed by local zoning and the Florida Building Code, and the rules vary by municipality across Miami-Dade, Broward, and Palm Beach. Zoning determines whether an ADU is permitted on a given lot, its allowable size, setbacks, and whether it can be rented, while the building code governs how it must be constructed as an independent dwelling.

Navigating these rules is one of the more complex parts of an ADU project, and it differs from city to city. We know how each jurisdiction treats ADUs and handle the zoning review, plans, and permitting. Our permit processing service manages the approvals an ADU requires. Call (305) 680-3283 to find out what is possible on your lot.

7. What an ADU Costs

ADU costs in South Florida vary widely with the type and size. A garage conversion ADU is among the most affordable options, while a new detached ADU costs more because it involves building a complete structure with its own foundation, systems, and finishes — essentially a small home.

Despite the investment, an income-producing ADU can deliver a strong return over time, and any ADU adds value to the property. We provide detailed, project-specific estimates so homeowners across the region can weigh the cost against the rental income and value an ADU will add.

8. The ADU Construction Process

Building an ADU follows the full construction sequence: design and planning, zoning review, sealed engineering, permitting, then construction — foundation, framing, roofing, full electrical, plumbing, and HVAC, and interior finishes including a kitchen and bath. A detached ADU is, in effect, building a small house.

Because an ADU includes every system of a home, it requires the same care and coordination as new residential construction. We manage the entire process end to end, delivering a finished, code-compliant, move-in-ready unit across Miami-Dade, Broward, and Palm Beach.

9. Choosing an ADU Builder

An ADU is a complete dwelling, so it calls for a licensed general contractor experienced in residential construction, zoning, and permitting — not a handyman. The right builder handles the zoning analysis, design, engineering, permits, and full construction, ensuring the unit is legal, safe, and built to last.

Proper licensing, insurance, and ADU experience are essential, given the zoning complexity and the systems involved. Homeowners from Kendall to Boca Raton choose us because we bring the full scope — from confirming what their lot allows to handing over the keys — under one accountable roof.

10. How Endless Life Design Builds ADUs

We handle ADUs comprehensively — assessing what your lot allows, designing the unit, securing zoning approvals and permits, and building it to current Florida code across every trade. Whether a garage conversion or a new detached cottage, we deliver a complete, independent living space ready for family or tenants.

For property owners, that turns a complex, high-value project into a finished result and a single point of accountability. Our design services shape the unit and our permit processing service clears the approvals. Call (305) 680-3283 to explore an ADU on your property.

Add an Independent Living Space With Endless Life Design

An accessory dwelling unit is one of the most versatile and valuable additions a South Florida property can have — a complete second home for rental income, family, or flexible space. From garage conversions to detached cottages, a well-planned, properly permitted ADU is an investment that pays back in income, flexibility, and lasting value.

Endless Life Design designs and builds ADUs across Miami-Dade, Broward, and Palm Beach every day. Call (305) 680-3283 or visit our website to learn about our design and permit processing services, and add an independent living space to your property.