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Premium Craftsmanship

Custom Cabinetry. Intelligent Storage Solutions.

Expert ADU contractors serving Medford, Billerica, and North Boston. We design and build fully functional, code-compliant accessory dwelling units for extended family or rental use.
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Fast Estimates

Detailed quotes delivered within 24 hours.

Fully Insured

100% Liability coverage for your peace of mind.

Expert Team

Trained professionals, no subcontractors.

Local & Trusted

Family-owned, Proudly serving MA.

SL
CARP
INC

ABOUT US

Building Dreams, One Project at a Time.

SL Carpentry was born from the partnership of Leandro and Sidinei, two master carpenters who decided to raise the bar. After years of working for others, we combined our skills to create a company that values quality, punctuality, and respect for your home.

We aren’t just contractors; we are your neighbors in Medford. Whether it’s a simple repair or a complex addition, we bring the same level of dedication and “clean work” philosophy to every job site.
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ABOUT SERVICE

The Smartest Investment in Your Property.

An Accessory Dwelling Unit (ADU) is more than just an extra room; it is a self-contained living space that significantly increases your property’s appraisal value and functionality. Whether you are looking to house aging parents comfortably or generate monthly rental income, an ADU offers flexibility that a standard addition cannot.

Building a “second home” on your lot requires navigating strict Massachusetts zoning laws and building codes. SL Carpentry manages the feasibility, permitting, and construction of these complex projects, ensuring your investment is legal, safe, and built to last.
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SOLUTIONS

Our ADU Solutions

Detached ADUs (Backyard Cottages)

We build standalone structures that provide complete privacy. We handle the excavation, foundation, and utility trenching required to bring water, sewer, and power to the new unit.

Attached ADUs (In-Law Suites)

We design seamless additions that connect to your main house but maintain a separate entrance. Perfect for multi-generational living where proximity and independence are both required.

Garage & Basement Conversions

We repurpose existing structures. We insulate, frame, and finish garages or basements, transforming them into legal dwelling units with proper fire separation and egress.

Complete Interior Fit-Outs

An ADU is a full home. We install compact, high-efficiency kitchens, full bathrooms, and laundry hookups, optimizing every square foot of the layout.

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WHY US

The SL Carpentry Difference

Why North Boston Chooses Us for ADUs?

Zoning & Permitting Expertise

ADU regulations vary by town (setbacks, square footage limits). We research your specific local ordinances to ensure your project is viable before we break ground.

Utility Management

Connecting a second unit to your main sewer and water line requires precision. We coordinate the plumbing and electrical tie-ins to handle the increased load safely.

Privacy-Focused Design

We position windows, entrances, and outdoor spaces strategically to ensure both the main house and the ADU maintain visual and auditory privacy.

Compact Living Efficiency

We know how to build small without feeling cramped. We recommend layouts and storage solutions that maximize the usability of limited square footage.

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GALLERY

Our Recent Results in Massachusetts

We let our work speak for itself.
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Stop Waiting on Contractors Who Never Call Back.

We respect your time. Get a detailed, honest estimate for your Deck, Remodel, or Repair within 24 hours of our visit.
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