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Exceptional Massachusetts and New Hampshire Home Remodeling Services
Since 2008, O’Sullivan Installs has helped thousands of homeowners enjoy superior services at competitive prices.

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Flexible Financing Options Available!

5 out of 5
Out of 23 Google Reviews
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O'Sullivan Installs

Professional Window, Siding & Door Replacement Experts

When investing in updates for your Massachusetts or New Hampshire home, you don’t want to take chances with quality. That’s why for house siding, windows, and doors, O’Sullivan Installs is the smart choice. We insist on the best for our customers including premium products from top brands and flawless workmanship delivered by experienced professionals. For results that add value, style, and energy efficiency to your home, put our 25 years of industry experience to work for you!

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Our Services

The Premier Window, Door, and Siding Replacement Professionals

Enjoy the benefits of top-rated windows, doors, and siding at competitive prices.

Replacement Windows

Replacement Windows

Trim your heating and cooling costs with the energy-efficiency of Aeris and SoftLite windows. Our large selection of styles makes it easy to find windows to suit every room in your home.

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Replacement Doors

Replacement Doors

Durable, stylish ProVia doors deliver the performance you expect. Innovative security and energy-saving features combine with impressive style to enhance your home’s curb appeal.

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Siding Installation

Siding Installation

Protect and beautify your home with quality siding, expertly installed. Our large selection of colors and styles makes it easy to find siding that complements the other features of your home’s exterior.

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Providing Exceptional Services for More than a Decade

Since the day O’Sullivan Installs did our first job, we’ve been committed to earning 100% customer satisfaction on every project, and that dedication to excellence is obvious in everything we do from the products we select to the warranties we provide. It all comes down to this: providing superior results and earning the trust of our clients.

No matter the style of your home or the size of your budget, our siding, door, and window replacement company has products to suit your needs, and we’re happy to take the time to show you all the options and help you make selections that provide the best possible results. The bottom line is that our door, siding, and window replacement company goes the extra mile to ensure you get phenomenal results at a fair price.

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Limited Time Offers

Lifetime Warranty Guarantee

We stand behind our work, so we offer a warranty on all our products and services.

18 Month Interest Free Loan Options

Flexible loan options to fit your needs! Enjoy no interest if paid off within 18 months.

O’Sullivan Installs Homeowner Referral Program

Like what you see from O’Sullivan Installs? Refer a friend and get rewarded!

See What Our Happy Clients Have to Say

"For window, door, and siding installs, Tim O’Sullivan and his crew are the best. I won’t go too deep into details, but they installed my insulated siding, new windows (including a bow window), and door. Everything came out great and they did the work in the winter snow. From the start to the finish the crew was on top of it and Tim (the owner) was either on site or communicated every day. They took care of all the little extras and did the minor changes without charging extra or writing up a change order. I can’t praise them enough for their professionalism or excellence."

Joe L., Burlington, MA

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Why choose O'Sullivan Installs

High-Performance Products and Superior Service

Top Brands

Top Brands

Our window, siding, and door replacement company uses only trusted brands like ProVia, Alside, and SoftLite.

Flexible Financing

Flexible Financing

In addition to fair prices, we also offer simple financing solutions that make it easier to budget for your next project.

Award-Winning Service

Award-Winning Service

Our attentive, courteous service has earned us many industry awards along with positive customer reviews.