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ADU and Detached Garage Services in Central New Jersey

 

 

If you’re like many of your friends and neighbors, adding an ADU or detached garage to your Central New Jersey home might have crossed your mind. The flexibility to create space for your hobbies, implement multi-generational living, or establish a short-term rental in an Accessory Dwelling Unit (ADU) can be tempting. At GTG Builders, we build ADUs and detached garages, allowing you to expand your home in yet another way. 

What is an adu?

Let's start with a definition. An ADU is a residential living unit with complete independent living facilities, including a kitchen and bathroom, located on the same lot as a one or two-family home. ADUs can take various forms, such as a detached unit, a unit that is part of an accessory structure like a detached garage, or a unit that is part of an expanded or remodeled dwelling. The term ADU is also used as a catch-all shorthand despite having a specific definition. 

State Regulations

New Jersey state laws are starting to cover ADUs and define them state-wide, which helps create continuity across municipalities. However, definitions and regulations can still differ from township to township, and it's important to work with a builder willing to dig deeper and define what is needed to build ADU in your area.  

Can You Build an ADU in New Jersey?

You can build an ADU in many parts of New Jersey, but as mentioned above, the specific regulations depend on your municipality. In a rising number of towns, ADUs are permitted as independent living spaces, making them ideal for adult children, aging parents, or rental properties. They can be detached, attached, or converted from existing spaces like garages.

It's important to work with a builder who stays current on the changing guidelines for your specific township. At GTG Builders, we pride ourselves on being Central New Jersey and Upper Bucks County experts.

Zoning, Permits, and Design

The distance your ADU needs to be set back from your property line and the nitty-gritty requirements differ based on your exact location. When you work with our team, we guide you through zoning, permits, and design to create an ADU that fits right in with your home. If you're thinking about building an ADU in your backyard, we’re here to make it happen correctly. 

Is Building an ADU Worth It?

Building an ADU is absolutely worth the investment. It allows you to stay in the neighborhood you love and keep your house's original footprint while adding separate, flexible living spaces for family members or even investing in a short-term rental property.

In the Garden State, it can be difficult to find available land, and moving often has its own set of challenges. By building an ADU, you are expanding what's possible on your property and setting yourself up for future options. 

The Right Contractor for Your ADU or Detached Garage

Finding reliable contractors for ADUs and detached garages is important for various reasons. Take a look at the list of characteristics we suggest looking for. 

select_check_boxKnowledge of ADU Laws
select_check_boxPermitting Experience
select_check_boxDesign & Building Experience
select_check_boxExceptional Craftmanship
select_check_boxStrong Communication
select_check_boxCustomized Designs
select_check_boxRegional Knowledge
select_check_boxTimeliness & Awareness
select_check_boxExpert Building Skills

WHAT IS A DETACHED GARAGE?

We've discussed the benefits of an ADU, but another type of accessory building is becoming more common on properties: the detached garage. As the name suggests, a detached garage is separate from the main home. This option provides space entirely dedicated to your passions and interests.

Whether you need it for classic car collecting, a workshop, or storage for golf carts and boats, you can finally have a designated space for your hobbies. This type of structure preserves your home's original design while adding functional new space.

Garage Living in NJ

Some of our clients convert an existing detached garage into an ADU, a trend known as garage living. This option can be more cost-effective than a completely autonomous ADU. Converting a garage can be financially savvy because the structure already has a foundation and frame. Our experts assess the feasibility of converting your garage and create a plan that transforms it into a comfortable living space.

Is a Detached Garage Worth It?

There are two answers to this question. If you already own a detached garage, transforming it into a functional space gives you more options for additional living space or hobbies.

Building a detached garage is a great investment if your hobbies require dedicated space. It allows you to maintain your home's aesthetic while providing the extra space you need to live comfortably.

 

OUR DESIGN-BUILD PROCESS

1 | Design

We take the time to understand your project, whether it's a custom home or remodeling project, while you get familiar with our process and expertise. Once you're committed to working with us, we'll figure out your starting point. The beginning step for a custom home differs from a remodel or addition. We build your design based on your stated needs and goals. Once your design is complete, we create and present your detailed Statement of Work.

2 | Construction

We start this portion by handling all necessary permitting and paperwork. With approvals in place, construction begins, turning designs into reality. This is the hammer and nail portion, where we build your custom home, remodel, or new addition. Our team oversees every construction and project management phase, using on-site meetings and project management software to keep you updated and track and organize all the paperwork and permits. 

3 | Post-Construction

After you’ve moved in, we remain available to assist with any questions or concerns. Whether it’s a simple check-in or helping with a minor adjustment, we prioritize long-term client satisfaction. Six months after completion, we’ll follow up to confirm everything is in top condition. A year later, we’ll reconnect to ensure everything is perfect and address any concerns that might have appeared. Our goal is your complete approval of the finished project.

Why Choose GTG Builders?

At GTG Builders, we bring decades of experience in high-quality custom construction, endless knowledge, and stellar customer service, ensuring your ADU or detached garage is built to last. Here’s why your friends and neighbors trust our team to do the job right. 

1. Expertise in Custom Builds

Whether it’s an ADU for extra living space, a detached garage for storing prized vehicles, or a workshop, we design and build to fit your lifestyle. We're no strangers to custom builds and taking a project from an idea to completion. In fact, that's what we specialize in. We'll see to it that your ADU or detached garage is given the same attention as a custom home or remodel. We offer homeowner resources to show you just what's possible. 

2. Expert Project Management

Your project entails so much more than just the construction phase. Our team expertly handles zoning, permitting, design, and communication, guaranteeing not only compliance with all regulations but a smooth process from start to finish. 

3. High-Quality Craftsmanship

Our projects are beautiful. We take pride in our design and building skills, letting our portfolio speak for itself as a testament to craftsmanship and expertise. We leverage our industry experience and connections to give you the highest quality project every single time. 

4. Clear Communication

There are many ways to communicate in this world, but not as many communicative professionals. One of our commitments to you is clear communication from day 1. We keep you in the loop on everything. There should be no ambiguities or unanswered questions when you work with us. 

 

ADU AND DETACHED GARAGE FAQS

Does an ADU Increase Property Taxes?expand_more

Adding a new structure to your home may lead to a slight increase in property taxes. This happens because the new structure adds to the assessed value of your property.

While the growth depends on the ADU's size, features, and local tax rates, it’s important to consult your local assessor. Many homeowners find the additional taxes worth the investment, as ADUs can provide rental income or extra space for multi-generational living.

How Much Does It Cost to Build a Detached Garage?expand_more

The price of building a detached garage in Central New Jersey varies depending on size, design, materials, and labor. Depending on its features, foundation, and structural work, a detached two-car garage can cost between $350,000 and $555,000.

The style and site work greatly impact the cost of your project. 

What is the ADU Bill in NJ?expand_more

There have been multiple ADU bills in New Jersey, including one in 2024 that required municipalities to adjust their standards to streamline the process of building ADUs. Towns must adopt model ordinances that encourage ADU development and remove unnecessary barriers.

Building ADUs in backyards or converting garages is now more feasible, although the exact details still depend on your township. As ADU legislation is constantly in flux, our team will provide real-time updates once you begin the process. 

Should I Build an ADU or a Detached Garage?expand_more

The choice to build an ADU or detached garage is completely yours, but there are some factors you ought to consider. Building an ADU might not be the best choice if you want simplified, short-term garage living.  

If you love the idea of an entirely separate living space and its flexibility, an ADU might be the right choice for you. Our team is ready to help you examine your options and advise you on making the right decision for your property. 

How Much Does an ADU Cost in New Jersey?expand_more

One of the most common questions we hear is, “How much does it cost to build an ADU?” The average cost of an ADU in Central New Jersey typically ranges between $350,000 and $500,000+, depending on the size, finishes, permits, and even issues like utility connections.

Remember: we are building these to be living units, which means they have all the amenities of a custom home, just on a smaller scale.

 

CONNECT WITH US

Whether the plan is an ADU in Central New Jersey or a detached garage in Upper Bucks County, we are committed to bringing your vision to life.

Contact us today to schedule a consultation and take the first step toward upgrading your home and property.

Our Work

Exterior custom-built grey-blue home with stone walkway leading to front door

What Our Clients Think

"Our search for custom home builders across New Jersey led us to GTG Builders, and it was the best decision we could have made. GTG impressed us with their exceptional craftsmanship, meticulous attention to detail, and unwavering commitment to bringing our vision to life. Their professionalism, transparent communication, and ability to make the process both seamless and enjoyable exceeded our expectations. We wholeheartedly recommend GTG Builders to anyone looking for a dependable, talented team to create their dream home." 

Joseph L.

Custom Home

custom living room with brown cabinets and white furniture by gtg builders in new jersey

What Our Clients Think

"GTG Builders did a fantastic job on our home addition! We had ideas and dreams that the GTG team brought to fruition. We were more than satisfied with their timely response to questions and their attention to detail. Bella, Max, Paul, Andrew, and Glen were incredible! At the end of our year long project, we felt like we had made some new friends. Thank you GTG Builders for making our dreams come alive! "

Teresa B.

Home Addition

Front view of GTG Builders’ custom three-story home in Brick, NJ, with a dual garage, inviting front porch, and Halloween decorations

What Our Clients Think

"GTG helped us tremendously with our new build. As someone who has been in the construction industry for over 33 years, I have an appreciation for what it takes to deliver projects on time and within budget. GTG’s entire team was responsive to our needs and ALWAYS just a phone call or text away. Their level of expertise and customer support is hard to find in today's marketplace. I would highly recommend them for your next project. The quality they deliver is unmatched."

Robert P.

Custom Home

single family custom home in clinton new jersey

What Our Clients Think

'GTG did a tremendous job in building our new home. Initially, we were overwhelmed with the concept of building a custom home, but Andrew did a great job of explaining the process and made us comfortable with taking on such a big project. "

Lucas O.

Custom Home

Custom Kitchen with dark and light contrast with modern appliances

What Our Clients Think

"What truly sets GTG Builders apart is the relationship they build with their clients—and how they maintain it long after the home is finished. Even years later, they continue to check in with us, just to see how things are going and make sure we’re still happy with our home. That level of care and follow-through shows that they don’t just build homes—they build lasting connections and genuinely care about the families they work with.

We absolutely love our home and highly recommend GTG Builders to anyone looking for a trustworthy, professional, and truly caring team! "

Sarah O.

Custom Home

Where we work

We build beautiful, luxury custom homes in Central New Jersey, including Hunterdon County, Somerset County, and Mercer County. Contact us to find out if we serve your area!

 

Our Service Area

Hunterdon Countyexpand_more
  • Flemington
  • Raritan
  • Raritan Township
  • Delaware Township
  • East Amwell
  • Clinton
  • Readington
  • Tewksbury
  • Califon
  • Annadale
  • Lambertville
  • Neshanic Station
  • Holland
Mercer Countyexpand_more
  • Hopewell
  • Pennington
  • Princeton
  • Lawrence
  • Hamilton
  • West Windsor 
  • East Windsor
  • Hightstown 
Middlesex Countyexpand_more
  • Plainsboro
  • New Providence 
  • New Brunswick 
  • South Brunswick 
  • East Brunswick 
  • Plainsboro
  • Cranbury 
  • Monmouth Junction 
  • Piscataway
  • Metuchen
  • Edison
  • Monroe
Morris Countyexpand_more
  • Chester
  • Chatham
  • Mendham
  • Morristown 
  • Washington 
  • Morris Plains 
  • Harding Township
Somerset Countyexpand_more
  • Hillsborough
  • Franklin
  • Somerset
  • Montgomery
  • Skillman
  • Bedminster
  • Peapack and Gladstone
  • Bernards
  • Bernards Township
  • Warren
  • Basking Ridge
  • Chester
  • Chatham
  • Long Valley 
  • Rocky Hill
Union Countyexpand_more
  • Berkley Heights
  • New Providence
Bucks County, PAexpand_more
  • Doylestown 
  • Solebury
  • Newtown 
  • New Hope 
  • Warrington 
  • Buckingham

Contact Us