South Shore MA
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The Trusted Accessory Dwelling Unit (ADU) Builder in South Shore MA
At J. McSharry & Sons, we believe your home should grow with you. Whether you’re creating a welcoming in-law suite, a private guest house, or a rental space for extra income, an Accessory Dwelling Unit (ADU) offers a smart and flexible way to expand your living area while staying right where you belong. ADUs have become one of the most practical ways to expand living space and increase property value across Massachusetts. With an ADU, you can:
As the trusted ADU builder on the South Shore MA, our team brings more than 50 years of experience to every project. We combine thoughtful planning, skilled craftsmanship, and personalized service to create ADUs that feel like a natural extension of your home, that are beautiful, functional, and built to last. Before starting, we will help you evaluate:
Explore Recent Accessory Dwelling and New Addition Projects
Explore how accessory dwelling unit and home addition projects throughout Norwell, Scituate, Hingham, Cohasset, Hanover, Marshfield, Pembroke, and surrounding South Shore communities reflect thoughtful planning, efficient use of space, and quality craftsmanship.
Trusted by Homeowners Across the South Shore
For more than 50 years, J. McSharry & Sons has built lasting relationships with homeowners throughout Norwell, Scituate, Hingham, Cohasset, Hanover, Marshfield, Pembroke, and surrounding South Shore communities. See what our clients have to say about working with our team on custom homes, additions, renovations, and remodeling projects.
Featured ADU and Home Addition Projects
From accessory dwelling units to thoughtfully planned home additions, we bring craftsmanship and care that South Shore families have trusted for decades.
Most Popular Types of ADUs We Build
At J. McSharry & Sons, we plan and build every accessory dwelling unit to fit your property, lifestyle, and local zoning requirements. Whether you’re looking for a private in-law suite, rental apartment, or flexible living space, our team brings decades of experience to every project.
A standalone structure built on your property, offering complete privacy and independence — ideal for guests, family members, or rental income.
A newly constructed addition that shares one wall with your existing home but has its own entrance, kitchen, bath, and living space. Perfect for expanding without building a separate structure.
Transform an unused garage into a beautiful apartment or studio space while maximizing the footprint of your property.
Add valuable living space above an existing or new garage — a smart way to gain square footage without altering your yard.
Convert your lower level into a self-contained living space with its own entrance, kitchen, and bathroom. A great option for multi-generational living or rental use.
Repurpose underused interior space — such as an attic, bonus room, or portion of your home — into a fully independent unit that blends seamlessly into the home’s layout.
Each ADU type offers unique advantages depending on your goals, property layout, and local zoning. Our team will help you explore all available options to find the perfect fit for your vision and budget.
Our ADU Building Process From Start to Finish
Our 5-step process keeps your build organized, efficient, and stress-free:
1
Consultation & Site Evaluation
Every great project begins with a conversation. We listen to your goals, review your property, and assess local zoning regulations in your town to ensure your ADU is feasible and properly permitted.
2
Planning & Permitting
We help you develop a layout that fits your needs — whether it’s a detached ADU, above-garage apartment, or basement conversion — and handle all permitting and inspection coordination with South Shore building departments.
3
Construction
Our experienced team manages every phase — excavation, framing, electrical, plumbing, roofing, and finish work — using the same high-quality materials and craftsmanship that have defined J. McSharry & Sons for decades.
4
Interior Finishing
We complete your ADU with efficient systems, modern finishes, and thoughtful details — including kitchenettes, bathrooms, HVAC, lighting, and trim work — creating a comfortable and fully livable space.
5
Final Walkthrough & Handover
Before completion, we perform a detailed walkthrough to confirm every element meets our quality standards — and your expectations. The result: a fully finished ADU, move-in ready and built to last.
Ready to Add an Accessory Dwelling Unit?
If you are considering an accessory dwelling unit for your property, the JMS team can help you plan a space that feels functional, well integrated, and built for long-term use. Whether you are creating room for family, adding a private guest space, or making better use of your property, our team can guide the project from early planning through construction. You can also explore our home addition and home remodeling services for other ways to expand or improve your home.
As you begin planning, visit our Insights page for helpful articles and home improvement guidance, or browse our portfolio to see the craftsmanship and attention to detail that define our work throughout South Shore MA.
To take the next step, simply fill out the form to request a consultation. We look forward to learning more about your property and helping you create an ADU that adds useful living space, flexibility, and lasting value to your home.
Our Commitment to Quality
Satisfaction Guaranteed
50 Years Experience
Work Backed by Warranties
Family Owned and Operated
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Fully Licensed and Insured
Bring your vision to life. Schedule a free consultation today!
J. McSharry & Sons is the trusted general contractor and home builder serving Norwell, Scituate, Hingham, Cohasset, Hanover, Marshfield, Pembroke, and communities across the South Shore of Massachusetts. For over 50 years, we have helped homeowners with custom home builds, renovations, additions, ADUs, finished basements, and other residential construction projects, with a focus on quality craftsmanship, attention to detail, and hands-on service.
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