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Premium Craftsmanship

Window Replacement. Efficiency Meets Aesthetics.

Expert window installation contractors serving Medford, Billerica, and North Boston. We replace drafty, outdated units with high-performance, energy-efficient windows tailored to your home’s style.
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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 Clear Choice for Comfort and Value.

New windows are more than just a cosmetic upgrade; they are a critical defense for your home’s envelope. Replacing old, single-pane glass significantly lowers your heating and cooling bills while instantly boosting your property’s curb appeal. Whether you are looking to eliminate cold drafts in the winter or reduce outside noise, modern windows offer a return on investment that few other renovations can match.

Proper installation is just as important as the glass itself. SL Carpentry manages the entire process, from accurate measuring to weather-tight flashing and trim work, ensuring your new windows are leak-free, secure, and built to withstand New England weather.
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SOLUTIONS

Our Window Solutions

Double & Triple Hung Windows

The classic choice for New England homes. We install tilt-in sash models that allow for easy cleaning from the inside and offer timeless style with modern thermal performance.

Casement & Awning Windows

We install crank-out windows that provide maximum ventilation and a tighter weather seal when closed. Perfect for hard-to-reach areas like above kitchen sinks or in bathrooms.

Bay & Bow Windows

We create architectural features that add actual square footage and light to your room. We handle the structural framing and roofing required to support these extended units safely.

Full-Frame Replacement

Unlike simple inserts, we remove the entire old unit down to the studs. This allows us to inspect for rot, insulate the gaps properly, and install new interior and exterior trim for a flawless finish.
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WHY US

The SL Carpentry Difference

Why North Boston Chooses Us for Windows?

Waterproofing Expertise

A window is only as good as its seal. We use advanced flashing tape and foam insulation techniques to prevent water intrusion and air leaks that cause rot.

Carpentry-First Approach

Many "window companies" just caulk and leave. As master carpenters, we craft custom interior sills and exterior casings that blend your new windows perfectly into your existing siding and drywall.

Brand Agnostic

We aren't tied to one expensive manufacturer. We help you select the best vinyl, wood, or composite windows for your budget and aesthetic needs.

Clean Installation

We treat your home with respect. We use drop cloths, vacuum all debris, and dispose of your old heavy windows so you aren't left with a mess.

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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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