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Long Island’s Plumbing and Heating Construction Source Since 1995

DeMonte Plumbing & Heating Corp.

Fully licensed and insured in both Suffolk and Nassau counties, DeMonte Plumbing & Heating is Long Island’s complete resource for all commercial construction.

A Complete Range of Plumbing & Heating Services

We specialize in new commercial construction projects, but also offer a wide array of complementary services to support our clients’ properties at every stage.

Commercial Construction

We meticulously plan every step along the way. Even the largest commercial construction projects get completed on time and without a hitch.

Commercial Expansion

We’ve managed building expansions of all sizes and scope. Although every project is different, our commitment to quality and service remains the same.

New Construction

We partner with contractors across Long Island on a wide variety of new commercial construction projects.

The DeMonte Difference


Attention to Detail

Even the largest commercial projects require the sharpest attention to detail.


Personal Service

DeMonte Plumbing is a true family-run business, and we extend that personal touch to every project we undertake.


A Long Island Institution

In business since 1995, DeMonte Plumbing & Heating has established a 20+ year reputation for quality and integrity.


No Surprises

We carefully plan every aspect of our projects beforehand, ensuring a fair price… and minimizing unpleasant surprises… for our clients.

Come Visit Us


367 Veterans Memorial Hwy
Commack, NY 11725 USA


(631) 864-2346

Business Hours

Mon to Fri: 9:00 – 6:00