Home Addition Builder in Suffolk and Nassau Counties

At C.P. Gallagher Construction Corp., we specialize in creating beautiful and functional home additions that provide the extra space you need. Whether you’re looking to add a new room, expand your living area, or build an entirely new floor, our team delivers high-quality craftsmanship and personalized service. Transform your home with our seamless additions that blend perfectly with your existing structure.

Request a Callback

Fill out the form below and we will call you back to talk about your project.
Your Name(Required)

More Room, More Comfort – Contact Us Today!

A home that no longer meets your needs can be frustrating. Whether your family is growing or you need more space for hobbies and activities, adding an extension or a new room can make all the difference. At C.P. Gallagher Construction Corp., we specialize in building home additions that enhance your living space and improve your quality of life. Our expert team works with you to design and construct additions that seamlessly integrate with your home, ensuring functionality and aesthetic appeal.
A warm, welcoming living room featuring a white marble fireplace, wall-mounted TV, leather recliner, beige sofa, and layered rugs — designed for comfort, style, and seamless daily living in this remodeled home.
A warm, inviting living room featuring two gray sofas, bold teal armchairs, a black coffee table, and a white marble fireplace — accented by built-in white bookshelves and soft pink walls for a sophisticated, layered look in this remodeled home.
About C.P. Gallagher Construction Corp

Meet C.P. Gallagher Construction Corp.

C.P. Gallagher Construction Corp. has been transforming homes in Huntington, NY, for decades. Our expertise in home additions ensures that every project is completed to the highest standards. We focus on delivering personalized service, meticulous attention to detail, and exceptional craftsmanship. Our goal is to create additions that not only enhance your home’s functionality but also reflect your unique style and preferences.

Read Our Customer Reviews

We pride ourselves on exceeding our customers’ expectations. Our commitment to quality and customer satisfaction is reflected in the positive feedback we receive from our clients. We strive to keep every customer happy by delivering top-notch service and outstanding results.
Susan Keller
"I would definitely recommend CP Gallagher Construction. I am very happy with their work. We had an addition built which included a dining room, bedroom, bathroom and family room. They are very reliable and did a great job. They are easy to work with and very detailed oriented. They made sure everything was done right and were on top of everything."
Steve Russell
"Chris is thorough, fair, and responsible. He is exceptionally honest and completely above-board. Unlike (some contractors), Chris doesn't guess or wish or exaggerate, but strives for accuracy and fairness. He sets high standards for himself and demands similar standards from his workers and subcontractors."
Tina Carpenito
"They built an in-law apartment for us that included a bedroom, bathroom, living room and kitchen. It was amazing what they did. I can't say enough about Chris Gallagher. He is reliable and honest, and worked rain or shine. If there was a problem, you knew his team would deal with it. They are a pleasure to work with. There wasn't one day they didn't show up."
Rebecca A Byrnes
"Chris was able to renovate our old house on deadline while keeping the quality exceptional. When we were ready to renovate our kitchen and finish our basement it was a given that Chris would perform the work. He worked with us on every detail and was committed from the start till he came back to install the last knob."
Steve Beinhorn
"Just a quick note thanking you for the quality work you did in renovating my basement. What a difference! My wife and I also appreciate the fact that you delivered the job in the time frame you promised and that there were 'no surprises; throughout the process. You, your team, as well as all your sub contractors were neat and professional every day...."
Andy
"Your guys were punctual, worked neat and as a team. Your updates on each phase was accurate as everything unfolded as you described it would. We look forward to our new project. If you ever need a reference you can always give our number. You guys are great and the finished product reflects this. Thanks again."

Let’s Build Your Dream Home Addition Together

Ready to expand your living space? Contact C.P. Gallagher Construction Corp. today to schedule a consultation. Let us help you create the home of your dreams with our expert addition services.

From Concept to Completion: Our Process

At C.P. Gallagher Construction Corp., we aim to make your remodeling journey smooth and stress-free. Our comprehensive process ensures clear communication, meticulous planning, and expert execution from start to finish. Here’s how we transform your vision into reality:
STEP 1

Consultation Visit

Our process begins with a complimentary consultation where we listen to your ideas, discuss your needs, address your budget concerns, and establish a timeline for your project. This visit helps us understand your vision and set the foundation for a successful home addition.
STEP 2

Feasibility Study

We evaluate your ideas and needs, help finalize an affordable budget, review your architect’s plans, or create original conceptual drawings. Our team considers the best products and solutions to meet your requirements and ensure the best outcome.
STEP 3

Design Agreement

Based on the feasibility study, we present a design agreement for your review. This document outlines the scope of work, materials, and timeline, ensuring transparency and mutual understanding.
STEP 4

Construction Contract

Once the design is approved, we finalize a construction contract that includes detailed plans and product selections. This contract serves as a roadmap for the entire project, keeping everything on track.
STEP 5

Construction Period

The actual construction begins, with our team handling every aspect of the project. We minimize disruption to your daily life and ensure a clean and safe work environment. The project concludes with a thorough walkthrough and checklist to ensure all expectations are met. We stand behind our work with a two-year warranty on workmanship.

Get Your Free Consultation Today!

Discover the difference that professional remodeling can make in your home. Our team is dedicated to bringing your vision to life with precision and excellence. Contact us now to schedule your free consultation and start your journey toward a beautifully transformed space.
A vector image of a mobile phone showing exchange of messages

Common Questions About Our Services

We understand you may have questions about our services, and we’re here to help. Below are some common questions we receive. If you have more, don’t hesitate to contact us for more information.
Typically, a home addition takes 3-6 months, depending on the scope and complexity of the project.
Costs vary based on the size and complexity of the addition, but we work with you to create a budget that fits your needs.
Yes, most home additions require permits, and we handle all the necessary paperwork.
Yes, we aim to minimize disruption, so you can stay in your home during the construction.
We use high-quality materials and work with trusted suppliers to ensure durability and aesthetics.
Absolutely, we offer design services to help you plan and visualize your new addition.
Yes, we provide a two-year warranty on our workmanship.
We are flexible and can accommodate changes, but it may affect the timeline and budget.
Contact us to schedule a free consultation and we’ll guide you through the process.

"*" indicates required fields

Your Name*

Start Your Journey to a Beautiful, Functional Home with Our Expert Team

Expand your home with the expert team at C.P. Gallagher Construction Corp. Contact us to schedule a consultation and begin your journey to a more spacious and functional home.

CALL US TODAY

‪(631) 365-5920‬

Get in Touch

Call us or fill out the form below and we will call you back as soon as possible.
Your Name(Required)