About LMJ

 LMJ Management and Construction, based in Islandia, NY, is a commercial and industrial general contractor and construction manager proudly serving Long Island since 1984. Our projects range from small renovations to large-scale facilities over 500,000 square feet. Every project is guided by hands-on involvement from ownership, ensuring clear communication, accountability, and consistent quality from start to finish.

Our Mission

At LMJ Management & Construction, we build more than facilities—we build long-term partnerships. Our focus is on each client’s vision, supported by clear communication and dependable execution, delivering work we stand behind.



President and CEO

Josh Seiden

While working part time for LMJ, Josh attended Hofstra University and graduated with a degree in business management. After graduation, Josh came on board full time for LMJ as a project manager, overseeing and coordinating construction projects from beginning to completion.

Josh began his role as President/CEO in 2013, with a focus on growing the business. LMJ has now expanded into a prominent general contracting company and construction management firm on Long Island.

Josh’s area of expertise has been building pharmaceutical plants, food distribution centers and logistical coordination facilities, throughout Long Island. Josh has grown LMJ to be one of the most trustworthy construction firms on Long Island and he is eager to personally work on every aspect of your construction project.