Take advantage of recent legislation in MA and explore a luxury Accessory Dwelling Unit (ADU) for your property. Whether you’re looking to create a serene retreat, a sophisticated home office, or a comfortable space for guests, our custom-designed ADUs are constructed to enhance your lifestyle and increase your property’s value.

Your ADU Builder in Massachusetts
Enhance your home and property with a high quality attached or detached ADU

Navigating the new
ADU legislation in Massachusetts

The recent statewide legalization of Accessory Dwelling Units (ADUs) in Massachusetts has opened up opportunities for homeowners to enhance their properties. Whether you’re considering a detached or attached ADU, the new legislation offers flexibility to create versatile living spaces that meet your specific needs.


Detached vs. Attached ADUs

Choose between a standalone unit that provides complete privacy or an integrated space that connects directly to your home. Each option offers unique benefits depending on your property layout and lifestyle goals.


Expert Guidance

We simplify the process by handling all permitting and zoning requirements, ensuring your ADU project is fully compliant with state and local regulations. We're one of the top ADU builders in Massachusetts to help you get the ADU of your dreams within a few months.


Maximize Your Property's Potential

With major legislative barriers removed, now is the perfect time to invest in a luxury ADU that not only enhances your home’s value but also provides a functional and beautiful addition to your living space.

ADUs that are more than just additional spaces – they are extensions of your home’s luxury and functionality.

Our seamless process takes you

from vision to reality within a few months

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  • Initial Consultation

    We take the time to understand your vision, needs, and goals for your ADU. This is our opportunity to listen, gather detailed information, and provide expert advice to ensure your project starts on the right track.

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  • Concept and Design

    We refine your ideas into a workable plan, assessing the practicalities and requirements. We draft an initial design and project proposal that reflect your needs and style in alignment with your budget and timeline, laying a solid foundation for the next steps.

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  • Permitting & Site Preparation

    We take care of all the necessary permits and handle every aspect of site preparation, ensuring a smooth and hassle-free start to your ADU project. Our expertise in navigating local and state regulations means your ADU will be fully compliant, so you can focus on your exciting home addition ahead.

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  • Building Stage

    Now we can watch as your ADU is built within 90 days. Our skilled team manages every aspect of the construction process, ensuring that all work is done to the highest standards, with minimal disruption to your daily life.

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  • Final Touches & Completion

    Following incremental reviews, check-ins and updates throughout the building process, we conduct a thorough final walkthrough to ensure everything meets your expectations. We make sure your new ADU is completed to your satisfaction and leave you with a beautiful luxury space that you feel proud of.

Building a luxury ADU with Hawthorn Builders is a streamlined and stress-free experience.

Choosing Hawthorn Builders for your ADU construction means
unmatched craftsmanship and modern efficiency

 Our luxury ADUs stand out for their superior construction, design, premium materials, and commitment to sustainability. Here’s why our ADUs are the perfect choice for discerning homeowners

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Energy Efficiency

Our ADUs feature top-tier insulation, energy-efficient windows, eco-friendly materials and smart home technology, reducing your carbon footprint while cutting energy costs.

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Premium Materials

We use only the finest, high-quality materials in the construction of our ADUs, ensuring that your additional living space is aesthetically pleasing and built to last.

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Customization

Every aspect of your ADU is meticulously crafted inside and outside to reflect your desired style and functional needs to feel like a natural extension of your home.

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Efficient Process

Our streamlined design and construction process is engineered to deliver your luxury ADU within months, without compromising on quality or attention to detail.

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CUSTOM HOMES
  • 5★★★★★

    Hawthorn Builders has been recognized for both design and service in the annual Best of Houzz awards for the top-rated home pros in the design-build category. Houzz features a "design build firms near me" tool for users to search for experts in their area.

CUSTOM HOMES

  • Named a second time to the Best of Boston Home awards, Boston Magazine's list of winners based on their annual survey to subscribers in the Boston Area, Hawthorn Builders was the top selection in the Design/Build, West category.

CUSTOM HOMES

  • Boston Magazine subscribers named Hawthorn Builders to the Best of Boston Home list for the Custom Home Design/Build, West category.

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  • Accredited since May of 2018, Hawthorn Builders boasts a BBB Rating & Accreditation of A+

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  • Hawthorn Builders, renowned for their green energy building design and construction methods, holds a coveted certification from Phius (Passive House Institute US). Phius Certified Builders are construction professionals trained to meet the challenges of building to the rigorous Phius passive building standard. Phius certifies the most passive house projects and builders in North America who put passive at the forefront of the zero-energy movement.

Higher satisfaction

proven by Hawthorn's many awards

and the design build method rated highest by the Design-Build Institute of America compared to all other construction delivery types.

We had a wonderful experience with Hawthorn! From the beginning they were professional, organized, and communicative. The end result is amazing and we are happy in our new home. We actually miss the building process because we had so much fun working with the Hawthorn team!

Jeff & Anne
DESIGN BUILD CONTRACTOR SERVICES

Our satisfied clients

DESIGN BUILD CONTRACTOR SERVICES

We’ve successfully crafted

250+ dream homes

You can trust our experienced team of design build architects to bring your vision into reality

Call us and we'll be in touch within 24 hrs

Common Questions

See some common questions and answers below, or call us at 781-707-6564

  • What is an ADU and how can it benefit my property?

    An ADU, or Accessory Dwelling Unit, is a secondary housing unit built on the same property as a primary residence. ADUs can be used as a rental income source, a guest house, or living space for aging family members. As an expert ADU builder, we can design and construct ADUs that seamlessly blend with your primary home, adding value to your property and increasing equity. ADUs are an excellent investment, offering flexibility and functionality to homeowners looking to maximize their living space.

  • How does the ADU building process work?

    As experienced ADU builders, our process begins with an in-depth consultation to understand your vision and requirements. We then move into the design phase, creating floorplans that optimize space and functionality. After securing the necessary permits, our team handles all construction, from foundation to final touches. Throughout the project, our project management team ensures everything stays on schedule and within budget. Our goal is to make the ADU building process seamless, delivering a high-quality, energy-efficient unit that meets your expectations.

  • Are ADUs a good investment in Massachusetts?

    Yes, ADUs are a great investment in Massachusetts, especially with rising housing costs and the demand for flexible living spaces. An ADU can increase your property’s value, provide rental income, and offer additional living space for family or guests. As an ADU builder with extensive experience in Massachusetts, we ensure that your ADU meets all local regulations and enhances your property’s appeal. By choosing a reputable builder, you can maximize your return on investment and enjoy the benefits of a well-designed ADU.

  • What are the design options for ADUs?

    ADUs can be designed in various styles to match your existing home or create a distinct look. Our team of architects and designers will work with you to develop a custom ADU design that fits your needs and aesthetic preferences. Whether you want a modern studio, a cozy cottage, or a more traditional villa-style unit, we provide flexible design options that maximize space and functionality. As a dedicated ADU builder, we focus on creating designs that are both beautiful and practical, ensuring your new space enhances your property.

  • How long does it take to build an ADU?

    The timeline for building an ADU can vary depending on the complexity of the design, permitting process, and construction challenges. Typically, the entire process—from design to completion—takes about 6 to 12 months. As your ADU builder, we prioritize efficiency and transparency, keeping you informed at every step of the project. Our project management team ensures that each phase is completed on time, delivering your finished ADU within the agreed-upon timeframe.

  • What regulations should I be aware of when building an ADU?

    Building an ADU involves complying with local zoning laws, building codes, and HOA regulations. As experienced ADU builders in Massachusetts, we are well-versed in these requirements and handle all aspects of permitting and compliance for you. This includes ensuring ADA compliance, adherence to building codes, and obtaining the necessary inspections. Our team will guide you through the legalities, making sure your ADU project meets all regulations and standards.

  • Can an ADU be customized for specific needs, such as accessibility?

    Absolutely. We specialize in designing ADUs that cater to specific needs, including accessibility for aging family members or individuals with disabilities. Our designs can incorporate features like ADA-compliant bathrooms, ramps, wider doorways, and accessible kitchen layouts. As an ADU builder focused on customization, we ensure that your ADU is not only beautiful but also functional and safe for all occupants.

  • What is the cost of building an ADU?

    The cost of building an ADU can vary based on factors such as size, design complexity, materials, and location. On average, the cost ranges from $200,000 to $500,000. As your ADU builder, we provide transparent pricing and work within your budget to deliver a high-quality unit. We also offer options to maximize your investment, ensuring that your ADU adds significant value to your property while meeting your financial goals.

  • How do ADUs impact property value?

    ADUs generally increase property value by adding livable space and potential rental income. They are particularly attractive in areas with high housing demand, such as Massachusetts. As experienced ADU builders, we ensure that your ADU is designed and constructed to enhance your property’s appeal, providing both immediate and long-term value. Our team focuses on quality craftsmanship and attention to detail, which are key factors in boosting property value through an ADU.

  • Can I convert an existing structure, like a garage, into an ADU?

    Yes, converting an existing structure, such as a garage, into an ADU is a cost-effective option. This approach often simplifies the construction process, as the foundation and structure are already in place. As ADU builders, we specialize in converting spaces like garages, basements, and attics into functional, stylish ADUs. We handle all aspects of the conversion, from design to permits to construction, ensuring your new ADU meets all requirements and exceeds your expectations.

  • What are the benefits of building an ADU with Hawthorn Builders?

    Choosing Hawthorn Builders as your ADU builder means partnering with a team that prioritizes quality, customization, and client satisfaction. We bring years of experience in construction, design, and project management to every ADU project. Our approach is client-centric, ensuring that your vision is realized with precision and care. From the initial consultation to the final walkthrough, we are committed to delivering a luxury ADU that enhances your property and meets your specific needs.

  • What are the steps involved in the ADU design process?

    The ADU design process begins with a consultation to understand your goals and preferences. Next, our architects create detailed floorplans and 3D renderings to visualize the space. We then refine the design based on your feedback, ensuring that every detail aligns with your vision. As your ADU builder, we focus on creating a design that maximizes space, functionality, and aesthetics. Once the design is finalized, we move forward with securing permits and beginning construction.

  • Can ADUs be energy-efficient?

    Yes, ADUs can be designed to be highly energy-efficient, incorporating features such as solar panels, energy-efficient windows, and high-quality insulation. Our team of ADU builders is committed to sustainable construction practices, ensuring that your ADU not only meets your needs but also minimizes environmental impact. By choosing energy-efficient options, you can reduce utility costs and contribute to a more sustainable future.

  • Are there financing options available for building an ADU?

    There are several financing options available for building an ADU, including home equity loans, construction loans, and government programs. As your ADU builder, we can connect you with financial experts who can guide you through the financing process. We aim to make the process as smooth as possible, ensuring that you have the resources needed to complete your ADU project.

  • How do I choose the right ADU builder?

    Choosing the right ADU builder is crucial for the success of your project. Look for a builder with experience in ADU construction, a portfolio of completed projects, and a reputation for quality and reliability. At Hawthorn Builders, we pride ourselves on our expertise in designing and building luxury ADUs that meet the highest standards of craftsmanship and client satisfaction. Our team is dedicated to delivering a seamless building experience and a final product that exceeds your expectations.

  • What are the key features of a luxury ADU?

    A luxury ADU is characterized by high-end finishes, custom design elements, and superior craftsmanship. Features may include gourmet kitchens, spa-like bathrooms, custom cabinetry, and smart home technology. As a luxury ADU builder, we focus on creating spaces that are both beautiful and functional, offering the amenities and comforts of a full-sized home within a compact footprint. Our goal is to deliver an ADU that enhances your property’s value and provides a luxurious living experience.

  • How do ADUs support multigenerational living?

    ADUs are an excellent solution for multigenerational living, offering independent living space for aging parents, adult children, or extended family members. These units provide privacy and autonomy while keeping family members close. As your ADU builder, we can design a space that meets the needs of all occupants, ensuring comfort and accessibility for everyone. Our custom ADU designs are tailored to support multigenerational households, fostering connection and convenience.

  • Can I use an ADU as a rental property?

    Yes, ADUs can be used as rental properties, providing a steady stream of rental income. This is especially beneficial in high-demand areas like Massachusetts. Our team of ADU builders will ensure that your unit is designed to appeal to renters, offering desirable features and high-quality finishes. We also ensure that your ADU complies with all local rental regulations, making it a valuable addition to your property.

  • What materials are best for ADU construction?

    The materials used in ADU construction depend on your design preferences, budget, and the intended use of the space. Common materials include durable hardwoods, high-quality tile, energy-efficient windows, and sustainable building materials. As your ADU builder, we will guide you through the selection process, helping you choose materials that meet your aesthetic and functional needs. We prioritize quality and sustainability, ensuring your ADU is built to last.

  • How do I start the process of building an ADU with Hawthorn Builders?

    To start the process of building an ADU with Hawthorn Builders, simply contact us to schedule a consultation. During this initial meeting, we will discuss your goals, budget, and timeline. As your dedicated ADU builder, we will guide you through each step, from design to construction to final inspection. Our team is committed to making the ADU building process as smooth and enjoyable as possible, delivering a space that meets your needs and exceeds your expectations.

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