About Us

Cold Spring Harbor Construction is a premier custom home builder specializing in the construction, renovation, and restoration of fine homes throughout Nassau and Suffolk County. Founded by Long Island native Greg Marzuk, the company is rooted in a passion for authentic materials, exceptional craftsmanship, and thoughtful design.

We believe great homes are built through collaboration. Working closely with our clients and their architectural teams, we deliver tailored solutions that align vision, lifestyle, budget, and timeline. Transparency, communication, and attention to detail guide every phase of our process.

With deep local expertise and long-standing relationships with premier craftsmen and suppliers, we understand the unique demands of Long Island residential construction. From modern residences to historic restorations, our experienced team ensures every project receives professional care and uncompromising quality.

The result is a home of lasting integrity, value, and distinction. We invite you to meet with us and begin bringing your vision to life.

Modern two-story house with white exterior, black window frames, front porch, steps, and gravel driveway under cloudy sky.
  • Large white house with multiple chimneys, large windows, and a patio with outdoor furniture, surrounded by a lush green lawn and trees.

  • Large multi-story house with a wrap-around balcony and large glass windows, surrounded by landscaped garden with plants, rocks, and outdoor furniture.

  • White two-story house with black window frames, front porch with columns, manicured lawn, and gravel driveway, under a partly cloudy sky.

  • Backyard of a white two-story house with a large brick chimney, outdoor furniture, and a lush green lawn, surrounded by trees.

  • Modern house with a rectangular swimming pool in the backyard, surrounded by a patio with lounge chairs and umbrellas, and lush green lawn with trees in the background.

Services We Offer

Custom Home Builds

We build fully custom new-construction homes tailored to your lifestyle, budget, and vision. From ground-up construction to final finishes, every detail is carefully managed and built to last.

Residential Renovations

We specialize in high-quality residential renovations that bring new life, comfort, and value to your home. From kitchen and bathroom remodels to full-home renovations and custom upgrades, our team combines expert craftsmanship with thoughtful design to deliver results you’ll love living in.

Residential Restoration

We specialize in high-end residential restoration, carefully preserving architectural integrity while enhancing comfort, functionality, and lasting value. Every detail is approached with precision, respect, and exceptional craftsmanship.