Custom built gas and wood burning fireplaces, stoves, and inserts — designed and installed by Long Island's most trusted family team.
From custom gas fireplaces to wood burning stoves, we bring warmth and elegance to every home on Long Island.
Custom gas fireplace installations with unlimited finishes. Available in three-sided, two-sided, and single-sided designs with cool-wall technology.
Learn More
Nothing beats the authentic experience of a real wood fire. We install premium wood burning fireplaces built to last a lifetime.
Learn More
Pre-cast and custom mantels and marble surrounds in a variety of styles, colors, and textures to complement any decor.
Learn More
For over four decades, CMJ Installations has been Long Island's go-to team for fireplace and stove installations. What started as a small family operation has grown into one of the most trusted names in the hearth industry.
We work with over 20 top manufacturers to bring you the best products at competitive prices — with friendly, expert service every step of the way.
Our StoryOur streamlined process makes your fireplace dreams a reality — from the first conversation to the final flame.
We visit your home, discuss your vision, and help you choose the perfect fireplace or stove for your space.
Our team designs a solution tailored to your home's architecture, style, and heating needs.
Our skilled technicians handle every detail of the installation with precision and care.
Sit back, relax, and enjoy your beautiful new fireplace with our full warranty backing.
Browse some of our favorite recent projects across Long Island homes.
"CMJ did an incredible job installing our gas fireplace. The team was professional, on time, and the finished product exceeded our expectations. Highly recommend!"
"We've used CMJ twice now — once for a wood stove and once for a custom mantel. Both times the quality and service were outstanding. A true family business."
"From the free estimate to the final installation, CMJ made the whole process easy and stress-free. Our new fireplace is the centerpiece of our living room."
A gas fireplace with a 30,000 BTU rating costs approximately 10.5 cents per hour to operate, making it an efficient and affordable way to heat your home.
An open hearth wood fireplace is only about 10% efficient — 90% of the heat goes up the chimney. Modern gas and wood inserts can achieve 70-85% efficiency, saving you money while producing more heat.
Yes! We provide free in-home estimates for all our services. Contact us to schedule a convenient time and we'll help you find the perfect solution for your home.
Yes, CMJ Installations is BBB Accredited with an A+ rating. We take pride in our reputation and commitment to customer satisfaction.
We work with over 20 top manufacturers including Majestic, Napoleon, Town & Country, DaVinci, Enviro, Pacific Energy, Monessen, Ortal, and many more. We'll help you find the perfect product for your needs and budget.
Click on any logo below to explore products from that manufacturer.
Click on any logo below to explore outdoor products from that manufacturer.
