Window Installation Services on Long Island

Beautiful Windows, Expertly Installed
Looking to upgrade your windows? NJM Mechanical and Contracting is Long Island's trusted name for professional window installation services. We bring craftsmanship, precision, and a personal touch to every project — because the right windows do more than just look good. They improve your home's energy efficiency, security, and value.

Small building under construction with blue wrap.

Why Choose NJM for Your Window Installation?

  • Experienced Professionals: Our team is trained, licensed, and passionate about delivering flawless installations.
  • Quality Products: We work with top-rated window manufacturers to ensure you get durability, style, and performance.
  • Custom Solutions: Whether you're replacing one window or upgrading your entire home, we tailor every project to your needs.
  • Transparent Pricing: No hidden fees. No surprises. Just honest, competitive quotes.
  • Local Expertise: As a Long Island-based company, we understand the local climate, building codes, and architectural styles.

Types of Windows We Install

  • Double-Hung Windows
  • Casement Windows
  • Sliding Windows
  • Bay and Bow Windows
  • Awning Windows
  • Custom Specialty Shapes

Signs You May Need New Windows

  • Drafts or temperature fluctuations
  • High energy bills
  • Windows that stick or won't open properly
  • Noticeable moisture between panes
  • Fading furniture and flooring from UV exposure
Spacious room with large arched window.

Our Seamless Process

  • Consultation:We listen to your needs, discuss your style preferences, and evaluate your space.
  • Selection: Choose from a wide range of window styles, colors, and features.
  • Installation: Our team handles everything — professionally, cleanly, and with minimal disruption.
  • Inspection: We walk you through the finished work to ensure complete satisfaction.

Energy Efficiency Matters

Upgrading your windows isn't just about curb appeal. Modern energy-efficient windows can significantly reduce heating and cooling costs, making your home more comfortable year-round. Ask us about ENERGY STAR® rated options!

Let's Get Started!

Ready to transform your home with beautiful new windows? Contact NJM Mechanical and Contracting today for a free consultation.

Proudly serving Long Island, including Nassau County, Suffolk County, and surrounding areas.