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Premium Craftsmanship

Double Your Square Footage. Maximize Your Asset.

Professional Basement Finishing contractors serving Medford, Billerica, and North Boston. We convert unfinished concrete areas into legally habitable living space, 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

Turn Wasted Space into High-Value Real Estate.

An unfinished basement represents 30% to 50% of your home’s potential floor plan, sitting unused. Finishing this space is the most cost-effective way to add square footage compared to building an addition. However, basements present unique challenges regarding moisture, ceiling height, and fire safety.

SL Carpentry specializes in technical basement conversions. We do not just cover walls; we engineer a comfortable, dry, and energy-efficient environment. From framing around HVAC mechanicals to installing egress windows, we manage the entire scope to deliver a turn-key expansion of your home.
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SOLUTIONS

Our Basement Finishing Solutions

Full Basement Conversions

We handle the complete transformation: framing, electrical, plumbing, insulation, drywall, and flooring. We create functional layouts for home offices, gyms, family rooms, or in-law suites.

Moisture Control & Insulation

Basements are damp by nature. We install proper vapor barriers, rigid foam insulation, and moisture-resistant materials to prevent mold growth and ensure thermal efficiency.

Egress Window Installation

Safety and compliance are non-negotiable. To legally count a basement room as a bedroom, it requires a proper exit route. We cut foundations and install code-compliant egress windows and wells.

Ceiling & Soffit Work

We maximize headroom while skillfully boxing in ductwork, pipes, and beams. We offer both drop-ceiling options for access or smooth drywall finishes for a polished look.
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WHY US

The SL Carpentry Difference

Why North Boston Chooses Us for Basements?

Fire Blocking & Code Compliance

Massachusetts code requires specific fire blocking in basement walls. We ensure all framing meets safety standards to pass town inspections seamlessly.

Material Selection

We avoid using organic materials directly against concrete. We use pressure-treated lumber and moisture-resistant drywall (green/purple board) in critical areas to ensure longevity.

Mechanical Access

We plan ahead. We install strategic access panels for your water shut-offs, cleanouts, and electrical junction boxes so future maintenance is easy.

Transparent Pricing

Basement projects can have hidden costs. We provide a clear, itemized scope of work so there are no surprises regarding flooring, lighting, or finish options.

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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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