Third generation home builders.

Seifert Construction is a family owned and operated third generation, full-service construction company serving the East End of Long Island. We specialize in building high end, luxury custom homes, and renovations where only the finest materials and highest quality craftsmanship is accepted. With over 200 completed projects in the last 20+ years, we have built a reputation as one of the premier custom home builders on the East End. We believe your home or business is not just another completed project for our portfolio, but a true representation of your dreams and our passion.



Our purpose as a company.

Our mission for each and every project is to provide the home or business owner with the highest quality construction along with the utmost in professional service. At Seifert Construction, we understand and share each client’s excitement for their project. We are committed to providing the highest standards of quality, safety, and excellence to each and every project.


Our values serve as a compass for our actions.


We believe it is important to establish trust with our clients by being completely open and transparent during the entire construction process.



We stay true to our core beliefs by not wavering from the values and principals we were raised on.





Quality craftsmanship is at the core of everything we do. We believe if you do something right the first time it will last a lifetime


Our greatest form of advertising is from our own customers. We had to earn their praise, and appreciate the accolades our clientele has given us.


We have been fortunate to work with many wonderful clients, architects, and subcontractors and value these relationships we have forged through the years.





A family legacy of home builders.

Seifert Construction is a family owned and operated construction company that has been in business for over 70 years. Over time, the scope of the company’s work has broadened without ever sacrificing its high standards of quality and service. Now in its 3rd generation, Seifert Construction has established itself as one of the elite eastern Long Island building companies.

History Poppy Carosel


Seifert Brothers was established in 1948 by brothers George and Frederick “Fritz” Seifert. The company was based in Rockaway and focused on custom carpentry and copper work. Seifert Brothers were responsible for much of the detailed construction on the estates of the North Shore.



Seifert Brothers was changed to Seifert Construction in 1959 by Fritz’s son Frederick, a master craftsman who was well respected and valued in the building industry. It was during this time that the company expanded into all phases of custom carpentry and high-end home building. The company was based in Smithtown and did a majority of its projects in the Hewlett and Brookville areas. In the early 80’s, Seifert Construction established its own custom cabinet and mill shop to better control quality on its projects.


Fred & John Seifert Construction Onsite


For the last 20+ years, the company has been owned and operated by Fred Jr. and John Seifert. In the late nineties, they moved their daily operations and mill shop facility out east to Mattituck, N.Y., and quickly developed a reputation for high-end quality work. In 2007, they moved into their brand new 4000 sq. foot headquarters and state of the art mill shop. Fred and John are actively involved in the day to day operations of the company and under their vision and guidance, have maintained the family legacy while expanding the company into a premier East End builder.