Gainesville Remodeling Blog | RRCH

How Long Does It Take to Build an ADU in Gainesville, FL?

Written by Bobbie Guthrie | Jan. 27, 2025

Adding an accessory dwelling unit (ADU) to your property in Gainesville is an exciting way to expand your living space and add value to your home.

But if you're asking how long it takes to build an ADU, timelines can vary depending on the style. We'll discuss how factors like permitting, design complexity, and construction determine the time your project will take.

Let’s explore the ADU building process to help you plan for success!

How Long Does It Take to Build an ADU?

The entire process of designing, permitting, and building a new Gainesville accessory dwelling unit (ADU) typically takes 10-18 months.

The design phase lasts 3-4 months, permitting can take 3-8 months, and the construction phase usually takes 5-7 months, depending on the complexity of the design and site conditions. Larger or more intricate ADUs may fall on the longer end of this range.

Working with an experienced ADU contractor can help streamline the process and keep your project on track.

 

What is the Process for Building an ADU?

Building an ADU involves planning, permitting, and construction, each phase requiring careful coordination.

But don't worry! An experienced design-build team ensures every step runs smoothly, from creating the design to executing construction and every little step in between. Let’s take a closer look at each step.

Planning & Design 

Designing your accessory dwelling unit (ADU) typically takes 2-4 months, giving your team time to create the detailed construction documents required for city submission.

Simpler designs move faster, while more customized ADUs with advanced features or unique site challenges may need extra time.

Got tricky topography, challenging soil, or strict zoning requirements? An experienced design-build team will tackle these hurdles head-on, keeping the process efficient and stress-free.

Whether your ADU is attached or detached, thoughtful planning ensures a design tailored to your needs and perfectly aligned with Gainesville’s local regulations.

 

 

Permitting 

How long does it take to get an ADU permit? Permitting in Gainesville typically takes 3-8 months, depending on your design complexity and city resources.

Factors like homeowner association (HOA) reviews or additional approvals may add time. Permit costs also vary based on whether you’re building a detached ADU or an attached addition.

Partnering with skilled professional home remodeling contractors ensures you navigate the process smoothly. Your team will handle all permit approvals, helping you stay on track and avoid delays.

Foundation & Construction 

Once permits are secured, the construction phase kicks off, typically lasting 5-7 months. The timeline depends on complexity—larger ADUs or two-story designs take more time, especially if specialized trades like stair installers or custom railing providers are needed.

Challenging site conditions, like steep slopes or tricky soil, along with weather and inspection schedules, can also affect progress.

Your ADU contractor will manage it all, ensuring a smooth process that balances precision with efficiency. From laying the foundation to crafting custom features, every step is focused on delivering a functional, stunning addition to your Gainesville home.

Finishes 

The finishing phase is where your accessory dwelling unit (ADU) truly comes to life, but it can add time to the timeline. Complex tile work, custom cabinetry, and intricate architectural details often require extra planning and longer lead times. Specialty trades like tile setters or custom carpenters may need to be scheduled well in advance to ensure precision and quality.

While these details take time, they’re what make your ADU uniquely yours. The result? A stunning, high-quality space that reflects your style and perfectly suits your needs—well worth the wait!

What Factors Impact How Long Your ADU Project Will Take? 

Several factors can influence how long to build an ADU, including size, customization, material availability, and added amenities. Larger or more complex ADUs naturally require more time for design and construction.

High-end finishes or features like full kitchens or outdoor spaces may also add to the timeline. Planning ahead with an experienced design-build team ensures your project runs smoothly and meets your expectations.

Size 

The size of your ADU is a key factor in how long it will take to complete. Larger square footage, extra rooms, or multi-story designs naturally extend the timeline due to increased framing, electrical, plumbing, and finishing work. On the other hand, a compact, single-story ADU can be completed much faster.

Collaborate with your design-build team to determine the right size for your needs, striking the perfect balance between functionality and a timeline that works for you.

Level of Customization 

The more customized your ADU, the longer it’s going to take—but the results are so worth it!

Unique architectural details, intricate tilework, and custom cabinetry all add time because they require precision and often involve multiple specialized trades. Features like a modern outdoor kitchen or one-of-a-kind finishes can stretch the timeline.

That said, these personalized touches make your ADU truly one-of-a-kind. Partnering with an experienced team ensures the process stays manageable while delivering a final result that’s everything you imagined.

Material Lead Times 

The materials you choose for your ADU can impact your timeline. Custom cabinets, imported tiles, or specialty stone like soapstone countertops often come with longer lead times. If you’re adding unique finishes like cedar accents, delays may depend on supplier availability.

The good news? Planning ahead with your design-build team ensures these materials are ordered early, minimizing any hiccups.

While it takes a little extra patience, the payoff is a beautifully crafted ADU built with the high-quality materials you’ve envisioned.

Amenities 

What you include in your ADU can make a big difference in how long it takes to complete. A fully equipped kitchen with high-end appliances, a spa-like bathroom with custom tile, or an extra en suite for guests will need more time than a simple kitchenette and shared bath.

Outdoor features, like a patio or a small outdoor kitchen, can also extend the timeline.

While these extras take longer, they elevate the functionality and charm of your ADU. Collaborate with your team to prioritize the amenities that fit your goals and timeline.

 

 

How Long Does It Take to Build Different Types of ADUs? 

The kind of ADU you choose has a big impact on the timeline. Garage conversions are the quickest since the structure is already there, while building a detached ADU from scratch takes the longest.

Whether you’re going for a detached, attached, or converted ADU, knowing your goals and partnering with an experienced ADU contractor will ensure the process stays smooth and stress-free.

How Long Does It Take to Convert a Garage to an ADU? 

A garage conversion is usually the fastest type of ADU construction, as the structure, foundation, and roof are already in place. Most projects are completed in 3-6 months.

If you’re building an in-law suite above the garage, additional structural reinforcements are required, which may add time. Accessibility features like elevators or chair lifts can also extend timelines. Garage conversions are an efficient way to add functional living space without a full build-out.

How Long Does It Take to Build an Attached ADU?

Building an attached ADU—an extension of your home—usually takes about 7-12 months. With utilities already in place, it’s quicker than a detached unit.

Think of it like adding a primary suite, complete with a bedroom, bathroom, and sitting area. You can even include an interior entrance for easy access to the main house.

The shorter timeline and seamless integration make attached ADUs a convenient and popular choice for homeowners in Gainesville looking to expand their space.

How Long Does It Take to Build a Detached ADU?

Building a detached ADU is the most time-intensive option, taking 10-18 months to complete. This process involves creating an entirely new structure with its own foundation, utilities, and roof—much like building a custom home, but much smaller.

Detached units provide the ultimate privacy and flexibility, making them ideal for long-term guests or rental income. However, the complexity of the project—such as challenging site conditions or custom features—can add time.

The investment in time and cost is balanced by the independence and versatility a detached ADU offers, making it a highly desirable choice for many homeowners.

Can You Build an ADU in Gainesville?

Of course, you want to know if building an ADU in Gainesville is legal. Yes, Gainesville permits one attached and one detached ADU per property, as long as they meet zoning and setback requirements. Whether you’re designing a compact in-law suite or a spacious detached ADU, compliance with local building codes is essential.

Working with an experienced ADU contractor ensures your project meets these standards safely and legally. From navigating zoning regulations to obtaining permit approvals, the right team will make your ADU building process smooth and stress-free.

What Are the Requirements for an ADU in Florida? 

In Florida, building an ADU requires compliance with zoning regulations, setback rules, and building height restrictions.

Each Gainesville accessory dwelling unit must meet specific square footage requirements and adhere to local building codes.

Permit approvals are essential and often involve reviews by city planning departments and, if applicable, homeowners' associations (HOAs). Working with an experienced design-build team ensures your project is designed to meet these standards, keeping your ADU safe, legal, and in harmony with local guidelines.

Does Having an ADU Increase Property Value? 

Adding an ADU can significantly enhance your home’s versatility and appeal, though the exact ROI depends on style, size, and market demand.

The boost to your quality of life with an ADU is hard to beat. Whether it’s hosting guests, giving an older family member their own space, or earning rental income, an ADU makes your home more dynamic and can be a great solution to your spatial needs.

 

 

What Is the First Step to Build an ADU? 

The first step to building an ADU is finding the best ADU contractor in Gainesville. Start by finding professionals with a proven track record of successful ADU projects.

A skilled design-build team will help you navigate design, permits, and construction seamlessly. Partnering with experts ensures your project stays within your budget, meets local regulations, and meets your needs and delivers your wants.

Building an ADU can be a major investment, so choosing the right team is the foundation for a successful project. Here are our top tips for finding your Gainesville ADU contractor.

Search Online and Ask for Recommendations

This may go without saying, but you'll begin by asking friends, family, and colleagues for recommendations. Also, a simple search online that combines your location and your project will serve up several potential contractors.

What do we mean? Search for something specific, like "Gainesville ADU contractors near me." This way, you'll create a preliminary list of local ADU builders to make these next few steps easier.

Read a Lot of Reviews 

Online reviews are an excellent way to gauge the quality of a Gainesville ADU contractor.

Look for feedback on communication, problem-solving, and adherence to timelines. Focus on reviews that mention similar projects to yours, such as detached ADUs or garage conversions. Reliable contractors will have a history of positive experiences and satisfied clients.

Check Out Portfolios 

A contractor’s portfolio speaks volumes about their expertise. Review completed projects to ensure their design style matches your vision.

Look for variety, craftsmanship, and innovative solutions. A comprehensive portfolio demonstrates the contractor’s ability to handle diverse ADU building projects.

Schedule Consultations

Consultations are your opportunity to ask questions and assess the contractor’s approach.

Look for someone who listens to your goals and provides clear, honest answers about timelines, costs, and challenges. A good contractor will offer insights tailored to your project, such as the placement on your property or material choices.

Don’t be afraid to compare options—this is about finding the right fit. A great partnership begins with trust and transparency.

 

 

Let's Have a Chat!

At Robinson Renovation & Custom Homes, we specialize in creating Gainesville accessory dwelling units that combine style, functionality, and value.

With our expertise, we’ll guide you through every step, from design to construction, ensuring your project runs smoothly and exceeds your expectations at every turn. Whether you’re dreaming of a detached ADU, a garage conversion, or a custom addition, our team is here to make it happen.

Let’s build a space that enhances your property and fits your lifestyle perfectly. Contact us today to start your journey to a beautiful, functional ADU!