What does an ADU cost in Massachusetts?

ADU costs depend on size, site conditions, and finishes. BuildX provides realistic cost ranges early in the process with no hidden fees or surprise charges. Contact us for a personalized estimate.

How long does it take to build an ADU?

BuildX guarantees a 100-day build from the day construction begins. Permits typically take 90 to 120+ days before construction starts.

An ADU (Accessory Dwelling Unit) is a self-contained living space on your property - sometimes called an in-law apartment, granny flat, or backyard cottage. It allows family members to live independently while staying close.

Does BuildX use modular or prefabricated construction?

No. All BuildX ADUs are traditionally stick-built structures constructed on site. This allows for greater design flexibility, long-term durability, and seamless integration with the primary home. BuildX does not use low-cost modular pricing models.

Who is the ideal BuildX customer?

BuildX works with homeowners and families seeking long-term housing solutions on their existing property. This includes families planning for aging in place, providing independent living space for parents or relatives, or creating a permanent home for adult children. BuildX does not work with traditional real estate investors focused on short-term returns.

Can I see a finished BuildX ADU in person?

Yes. BuildX arranges private, by-appointment showings so you can walk through a finished ADU in person, see the finishes and layout, and ask questions face to face. There is no charge and no obligation. Request one at buildx.com/private-showing, view completed projects at buildx.com/adu-projects, or browse layouts at buildx.com/adu-floor-plans.

Where does BuildX build?

BuildX provides residential design-build services across the South Coast of Massachusetts and Upper Cape Cod, including Plymouth, Duxbury, Marshfield, Hingham, Hanover, Carver, Kingston, Falmouth, Sandwich, Bourne, and over 30 additional communities in southeastern Massachusetts.

What is the difference between an ADU and an in-law apartment?

An ADU and an in-law apartment are very similar - both create independent living space on your property. The key difference is that an ADU, built under Massachusetts by-right law, gives you the legal option to rent it out later if your needs change. Some towns never had in-law by-laws, or had very strict ones, so building as an ADU provides more flexibility. An ADU can be attached to your home, detached in your yard, or even built within your existing footprint - it does not have to be a separate structure.

Is an ADU the same as a home addition?

An ADU can be built as a home addition - attached directly to your existing house - or as a standalone structure on your property. The difference is that an ADU is a fully self-contained living space with its own kitchen, bathroom, bedroom, and entrance. Many families looking for a home addition to house aging parents discover that an ADU is the better fit because it offers independent living while keeping family close.

Can I build an in-law suite on my property in Massachusetts?

Yes. Since 2024, Massachusetts law allows homeowners to build an ADU (accessory dwelling unit) by right on single-family properties. This means you no longer need special permits or town meeting approval. Whether you call it an in-law suite, in-law apartment, or ADU, you can add independent living space to your property for family members.

What housing options are there for aging parents besides a nursing home?

Many families are choosing to build an ADU on their property rather than place parents in assisted living or a nursing home. An ADU allows aging parents to live independently in a fully accessible home just steps away from family. As Buz Artiano of BuildX puts it, 70 percent of this decision is family dynamics and 30 percent is what you actually build. Building sooner also protects equity - Medicaid has a five-year look-back period on assets, so planning ahead matters.

Does an ADU increase my property value?

Yes. An ADU adds usable, permitted living space to your property, which directly increases its value. Homes with a completed ADU attract significant buyer interest - BuildX receives about 50 inquiries per week from families looking to build, and BuildX regularly walks families through finished units in person. If you ever decided to sell, a property with an ADU-ready setup would stand out in the market.

How do I know if my property can support an ADU?

BuildX evaluates your property early in the process to determine feasibility before you spend money on surveys or engineering. Key factors include lot size, setback requirements, septic capacity, and your existing home footprint. Under Massachusetts law, your ADU can be up to 50 percent of your primary home gross floor area or 900 square feet, whichever is greater. BuildX will not move forward until there is a high probability the project can work.

Massachusetts ADU Builder | Custom Stick-Built

Why BuildX

A Better Way to Build Your ADU

We don't cut corners and we don't use prefab. Every BuildX ADU is custom stick-built on your property by our own crews.

Custom Stick-Built

Every ADU is built from the ground up on your lot -- no prefab, no modular, no shipping containers. Real construction by real craftsmen.

Move-In Ready

We handle everything from permits to paint. Your ADU is delivered fully finished with kitchen, bath, flooring, and fixtures -- ready for day one.

40+ Years Experience

BuildX brings over four decades of home building expertise to every project. We know Massachusetts building codes inside and out.

Trusted by Massachusetts Families

What Families Say

Dean C. ★★★★★

We built a 900 sq. ft. ADU in Marshfield with BuildX, and the experience exceeded our expectations. This project was designed specifically to support our daughter, who has autoimmune issues, so attention to detail, cleanliness, and thoughtful design were critical. BuildX understood that from day one.

The Morris Family ★★★★★

Buz Artiano and his team did a complete rebuild on our 2K sq. ft. home after a second floor water feed let go while we were on vacation. Buz listened to us and worked to ensure the house was built to our expectations. We highly recommend Buz and the BuildX team.

Margaret V. ★★★★★

We couldn't be happier with our experience with BuildX. The finished result looks like it has always been part of the property -- from the exterior design to the landscaping and fencing, everything blends seamlessly. They completed the project in under 100 days.

Sam C. ★★★★★

We worked with BuildX and Buz Artiano to design and build a 1 Bed, 1 Bath ADU at our home in Freetown, MA and we couldn't be happier with the results! Their design-build process makes everything simple, and you can tell they genuinely care about quality.

George B. ★★★★★

BuildX is THE company to hire when it comes to building a new home/ADU. These guys are on top of it 100% of the time. I built a 2bd-1bth 900 sq ft with a two car garage under and I couldn't be more thrilled. Buz and his team made the process seamless, easy, and most importantly fun.

Keely F. ★★★★★

We recently had an ADU built on our property for my stepfather. The quality of the finished home is truly exceptional. Everyone who walks through it is amazed that it's only 900 square feet -- it feels much more spacious, and the craftsmanship stands out in every detail.

ADU Plans

Our Most Popular ADU Plans

View All ADU Floor Plans

2-bed 1-bath 801-900 SF Covered Entryway

X-3 The Haven $356,478*

The Haven delivers 900 GFA in a compact 28'-36' footprint, with 2 bedrooms, 1 bath, and a Covered Entryway, plus 9' ceilings, LED lighting,

2-bed 1.5-bath 801-900 SF Farmer's Porch

X-1 The Cottage $359,624*

The Cottage delivers 900 GFA in a compact 28'-36' footprint, with 2 bedrooms, 1.5 bath, and a Farmer's Porch, plus 9' ceilings, LED

1-bed 1-bath 500-650 SF Covered Entryway

X-2 The Hideaway $284,301*

The Hideaway delivers 610 GFA in a compact 20'-30' footprint, with 1 bedroom, 1 full bath, and a Covered Entryway, plus 9' ceilings, LED

Book a Private Showing Visit Our Learning Center

Real BuildX ADUs

Walk through completed ADUs built by our team - real projects, real families, real craftsmanship.

PLYMOUTH | 610 SQ FT | 1 BED | 1 BATH

PLYMOUTH | 900 SQ FT | 2 BED | 1 BATH

BOURNE | 725 SQ FT | 1 BED | 1 BATH

NORWELL | 900 SQ FT | 1 BED | 1 BATH

View Our Completed Projects

Our Guarantee

Built in 100 Days. Guaranteed.

From the day we break ground, BuildX guarantees your ADU will be built in 100 days. While permits typically take 90 to 120 plus days before construction begins, once we start, the clock is running and we deliver.

This is not a marketing promise. It is a commitment backed by 40 years of building experience, a dedicated crew, and a process designed to eliminate delays. We use premium materials, quality finishes, and craftsmanship you can trust to build an ADU that stands the test of time.

Timeline and eligibility vary by project and site conditions. We will confirm what applies to your home during your consultation.

Learn About Our 100-Day Guarantee

Pricing

What Does an ADU Really Cost?

A completed ADU home package ranges from $284,301 to $525,861, plus Site Work. Our 14 floor plans span the 610 sq ft Hideaway at $284,301 to the 900 sq ft Homestead at $525,861. These prices include the complete building package, foundation through move-in-ready finishes. Site Work is priced separately following a lot evaluation.

View ADU Pricing

About BuildX

Led by a Massachusetts builder with 40 years on the job site

BuildX was founded by Buz Artiano to bring four decades of Massachusetts construction experience to a single focus: building ADUs the right way. Buz has delivered more than $450 million in local projects for over 1,000 families across the South Shore and Greater Boston -- and every BuildX ADU is built with that same standard.

18 completed ADUs
in Massachusetts

“Phenomenal.”
Lt. Governor Kim Driscoll, on the BuildX 100-day build, after touring a finished BuildX ADU Read about the Lt. Governor's visit

Whether you are building for aging parents, creating a first home for an adult child, or keeping three generations on one property, our team brings hands-on experience to every project.

Ready to see what's possible?

Visit our ADU Home Tour or give us a call.

Don't Gamble With Your Home

Buz Artiano: $450M in Local Projects. 1,000+ Families.

Most builders learn on your dime. At BuildX, we've already done the work. We bring 40 years of grit and a $450 million track record to your property.

The BuildX Edge

▶

Zoning Mastery: We crush the local regulatory hurdles so you don't have to.

▶

Owner-Led Experience: You get Buz Artiano's 40 years of site experience on your dirt. No middlemen.

Done Right. Done Once. Built to Last.

Our Process

What This Looks Like for You

1

You understand your real options

We help you figure out what's actually possible on your property - before you commit to anything.

2

You know realistic costs before committing

Clear pricing ranges early in the process - no hidden fees or surprise add-ons.

3

You see and experience a real ADU in person

Walk through a completed BuildX ADU to understand the space, finishes, and quality.

4

Your ADU is designed for comfort and aging in place

We build for independence, safety, and long-term livability.

5

Construction is predictable and clearly communicated

Regular updates, respectful crew, clean job site - no surprises.

Come Visit Our ADU Home Tour

Walk through a fully finished BuildX ADU and see the craftsmanship for yourself. Open to the public every Saturday & Sunday.

Starting: September 26, 2026

Days: Saturdays & Sundays

Hours: 11:00 AM - 1:00 PM

Location: 74 Alden St

Tour Details & Directions

Learning Center

ADU Resources & Guides

Everything you need to know about building an ADU in Massachusetts -- from zoning rules to financing options.

The 10 Best ADU Builders in Massachusetts in 2026

A scorecard of Massachusetts ADU builders, scored on a weighted rubric: licensing, BBB standing, review depth, published pricing,

The 2026 ADU Buyer's Guide

Everything you need to know before building an ADU in Massachusetts: the 4 types, what it really costs, zoning and permits, financing, and

Article Budget Build

What Is a Perc Test and What Does It Tell You About Your ADU Septic Cost?

A perc test will measure how fast water moves through your soil, and that decides what the size and the price of your septic system will be.

Explore the Learning Center

Podcast

The BuildX ADU Podcast

Join Buz Artiano as he talks with industry experts about ADUs, building science, zoning, septic systems, and everything homeowners need to know before breaking ground.

Listen to Episodes

🎙️

What Our Clients Say

Built on Trust, Driven by Results

"We recently had an ADU built on our property for my stepfather. The quality of the finished home is truly exceptional. Everyone who walks through it is amazed that it's only 900 square feet -- it feels much more spacious, and the craftsmanship stands out in every detail."

- Keely F., Plymouth, MA

Ready to Build?

Let's Talk About Your ADU Project

Whether you're exploring options or ready to break ground, our team is here to answer your questions and help you get started.

LET'S TALK or call (781) 627-7000

Build Your Dream ADU
in Southeastern Massachusetts