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.