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Premium Craftsmanship

Maximize Square Footage. Increase Market Value.

Expert Home Addition Contractors serving Medford, Billerica, and North Boston. We execute complex structural expansions, from room bump-outs to second-story additions, fully compliant with MA building codes.
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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

Expand Your Footprint. Enhance Your Asset.

Adding square footage is the most direct way to increase the resale value of your property. However, it is a complex construction process involving zoning, foundations, framing, and roofing integration. We specialize in building seamless additions that look like they were part of the original blueprint, not an afterthought.

Whether you need a master suite extension, a larger kitchen, or a dedicated in-law unit, SL Carpentry provides the structural expertise required to alter your home’s envelope safely and efficiently.
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SOLUTIONS

Our Home Addition Solutions

Room Additions & Bump-Outs

We extend your foundation to create new bedrooms, bathrooms, or expanded kitchen areas. We handle the excavation, concrete work, and framing to ensure the new structure is stable and level.

Second-Story Additions

Maximize your lot usage by building up. We assess the structural load capacity of your existing frame and execute the vertical expansion, doubling your living space without sacrificing yard size.

In-Law Suites (ADUs)

We build independent living spaces attached to the main home. Perfect for multi-generational living or increasing property value through rental potential.

Garages & Sunrooms

From attached garage builds to four-season sunrooms, we construct functional, weather-tight structures that integrate perfectly with your existing siding and roofing.
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WHY US

The SL Carpentry Difference

Why North Boston Chooses Us for Additions?

Seamless Architectural Integration

An addition should not look like a patch job. We match rooflines, siding materials, and interior trim details so the new space flows perfectly with the existing house.

Permitting & Zoning Navigation

We handle the logistics. We ensure setback requirements are met and that all framing and insulation inspections are passed on the first walkthrough.

Structural Reinforcement

We don't just add on; we ensure the connection points are secure. We use proper flashing techniques to prevent future leaks at the seams between the old and new structures.

Efficient Project Management

We coordinate the timeline strictly to minimize the time your home is exposed to the elements during the build.

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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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