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About O'Sullivan Installs

Looking for responsible and reliable home remodelers? Then O’Sullivan Installs is the only company you need to call! From New Hampshire to Massachusetts, we’re proud to be a premier provider of high-quality windows, siding, and doors—installed by highly trained local experts and offered at surprisingly stress-free prices. 

From start to finish, we promise home improvements that are convenient, cost-effective, and fully customized to you. For your family home, you deserve nothing less!

Why Choose O'Sullivan Installs?

O’Sullivan Installs has been a trusted local business since 2008, and our long legacy of service is only exceeded by our many rave reviews from families like yours. We bring more than 25 years of experience to every job, and we are continuously striving to better meet the needs of the communities in which we serve. 

As a company, our business model is built on 100% customer satisfaction—and it shows! Here’s what our customer-oriented service approach means for you:

  • High-Quality Products: We have carefully chosen our brand partners because we know they offer the very best performance and value for windows, siding, and doors.
  • Reasonable Prices: We are not the cheapest remodeler out there, and we don’t claim to be. Instead, we focus on providing the best value over a lifetime.
  • Dedicated Service: We always strive for perfection, but in the event that we do make a mistake or you are not happy with something, we will be out to your house to make things right within 24-48 hours.

Many of our clients end up working with us for multiple remodeling projects. This is a direct testament of our willingness to stand behind the products we install and of our commitment to earning lifetime satisfaction. We’ll go above and beyond to earn your trust and to complete your project to the extremely high standards that the O’Sullivan team is known for!

Meet Our Owner, Tim O’Sullivan 

“I started in the window and door business at 18 years old. My first job was for a local corner shop in Lowell, MA, which gave me a unique experience working with exterior remodeling products. This was when storm windows were on their way out and replacement windows were starting to take over the market. Because I did a lot of glass and screen repairs and rebuilds, it provided a chance to learn all aspects of the product.

I also spent many years working in the install division of a big-box store. With this company, I started as an installer. This was a great experience as it taught me how to get very efficient with installations and procedures.

With my past experience and work ethic, I quickly moved up to a field manager position. This meant managing the crews, the installs, and the overall customer experience from the production side of the home improvement. This gave me a chance to learn how to better set customer expectations and how to work with our installers to exceed them. I was also responsible for training new hires and covering areas that weren’t managed as effectively as they should be.

After a couple of years, I accepted a consultant position. As an in-home consultant, I met with customers to help them decide on project scope and select the products that best fit their unique project. This taught me the importance of the products’ quality as well as relationship-building skills. It was also a great learning experience because it taught me how customers think about their renovations and which factors are most important to them before deciding to move ahead with a home remodeling company.

My goal in launching O’Sullivan Installs is to be the diamond in the rough. We don’t offer a buy-today discount to distract you from the remodel at hand, and we don’t offer the cheapest products on the market that won’t last. Instead, we offer what we feel are the best-quality products on the market with the highest-quality install you can get—and we offer it all at the best value. 

We are so confident in our services that they come with a 10-Year Workmanship Guarantee and a Lifetime Product Warranty.

% Tim O’Sullivan

Owner, O’Sullivan Installs

Get a Free Cost Estimate from Our Exterior Remodeling Experts

We’d love to help you transform your MA or NH home into something that looks and feels brand new. Call O’Sullivan Installs today to learn more about our customizable replacement windows, siding, and doors. To grab your free, no-obligation consultation right now, please fill out our quick online form!

Headquarters O'Sullivan Installs


  • 25 Sullivan Rd Unit 5 North Billerica, MA 01862
  • (978) 234-2297