10 Best Window Replacement Companies in Islip, NY

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Last Updated: February 25, 2025

Windows play a big role in the appearance of your house, as well as its energy efficiency. Upgrading your windows is an excellent way to increase the value of your home. In Islip, you could save nearly $215 per year on your power bills by upgrading your windows. Drafty or damaged windows can lower your home’s energy efficiency by up to 30%, according to the Department of Energy. If you can't decide on a window installation company, this is a great way to get started. Keep reading to discover the best window installation companies in Islip.

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Top Pick
4.1/5
  • Great quality
  • Free assesment
  • Timely Service
Most Customizable
4.0/5
  • Holds high customer ratings
  • Offers energy-efficient products
  • Provides a lifetime labor warranty
Best Customer Service
4.0/5
  • Award winning company
  • Products made in the US
  • Knowledgeable sales representatives

Top 10 Best Window Replacement Companies in Islip

Advertisement This site receives compensation from some of the companies featured in this listing, which may impact where and how products appear. When you click "Get Quote," you will be connected with partners who may contact you with information related to your inquiry. This listing doesn't feature all companies, products, or offers that may be available.

Renewal by Andersen of Long Island

Renewal by Andersen of Long Island Logo

Our Rating

User Rating

2029 New Hwy, Farmingdale, NY 11735 (631) 843-1713 renewalbyandersen.com

Free assessment

Good customer service

Price transparency

Educational website

Services Offered

Glass doors
Skylights
Bay windows
Window replacement/installation
Double-hung

Power Home Remodeling

Power Home Remodeling Logo

Our Rating

User Rating

1660 Walt Whitman Rd #140, Melville, NY 11747 (631) 339-7268 powerhrg.com

Timely service

Price transparency

Good customer service

Free assessment

Services Offered

Window replacement/installation
Energy-efficient options

Smithtown Window Replacement and Doors

Smithtown Window Replacement and Doors Logo

Our Rating

User Rating

43 Landing Ave, Smithtown, NY 11787 (631) 646-2386 smithtownwindowsdoors.com

Good customer service

Family-owned and operated

Energy-efficient windows and doors

Free assessment

Price transparency

Weekend availability

Educational website

Services Offered

Fiberglass frames
Vinyl frames
Tempered glass
Window repair
Glass doors
Double-hung
Custom window designs
Metal frames
Glass showers
Storm/impact windows
Triple pane glass
Wood frames
Bay windows
Energy-efficient options
Window replacement/installation

Melville Window Replacement

Melville Window Replacement Logo

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User Rating

560 Walt Whitman Rd, Melville, NY 11747 (631) 710-7533 melvillewindowreplacement.com

Price transparency

Good customer service

Free assessment

Educational website

Timely service

Services Offered

Triple pane glass
Tempered glass
Vinyl frames
Window replacement/installation
Window repair
Fiberglass frames
Bay windows
Double-hung
Custom window designs
Metal frames
Wood frames
Energy-efficient options
Glass doors

Glass Doctor

Glass Doctor Logo

Our Rating

User Rating

354 Smithtown Blvd, Ronkonkoma, NY 11779 (631) 619-6711 glassdoctor.com

24/7 emergency service

Membership plans for glass repair

Educational website

Home and auto glass

Good customer service

Price transparency

Services Offered

Custom glass
Energy-efficient options
Glass showers
Window repair
Mirrors
Glass repair
Glass doors
Window replacement/installation

Window King LLC

Window King LLC Logo

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User Rating

1075 Morris Park Ave, Bronx, NY 10461 (718) 792-5989 windowking.biz

Educational website

Estimate price matching

Good customer service

Free assessment

Free in-home consultation

No-interest financing

Price transparency

Timely service

Services Offered

Double-hung
Energy-efficient options
Vinyl frames
Glass doors
Window replacement/installation

Pro Quality Home Improvements Inc.

Pro Quality Home Improvements Inc. Logo

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User Rating

1120 Little East Neck Road, West Babylon, NY 11704 (631) 393-6812 proqualityhomeimprovements.com

Free assessment

Educational website

Good customer service

Price transparency

Timely service

Free in-home consultation

No-interest financing

Small business

Services Offered

Window repair
Window replacement/installation
Bay windows
Skylights
Glass doors
Energy-efficient options

Alure Home Solutions

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User Rating

1999 Hempstead Tpke, East Meadow, NY 11554 (516) 296-7777 alure.com

Special warranties for military

Online appointment scheduling

Good customer service

Price transparency

No-interest financing available

Free assessment

Educational website

Services Offered

Window replacement/installation
Glass doors
Double-hung
Glass showers

Sky Windows and Doors

Sky Windows and Doors Logo

Our Rating

User Rating

145 N Main St, Freeport, NY 11520 (516) 686-8485 skywindowsnj.com

Good customer service

Free assessment

Timely service

Educational website

Price transparency

Services Offered

Custom glass
Wood frames
Energy-efficient options
Storm/impact windows
Glass doors
Metal frames
Vinyl frames
Mirrors
Window replacement/installation
Glass showers

Bernie's Glass & Mirror

Bernie's Glass & Mirror Logo

Our Rating

User Rating

1554 Fulton St, Brooklyn, NY 11216 (917) 749-4858 berniesglass.com

Educational website

Timely service

Price transparency

Free assessment

Good customer service

Services Offered

Mirrors
Energy-efficient options
Skylights
Double-hung
Glass repair
Window repair
Window replacement/installation
Glass showers
Glass doors
Today's Homeowner Ranking Methodology

Today's Homeowner looks at dozens of datapoints on window replacement companies to come up with our data-driven rankings. It's not possible for a company to pay for preferential treatment in our rankings. We look at the following key factors in determining who should top our list:

  • Company Experience
  • Real User Reviews
  • Company Reputation
  • Accreditations and Licenses
  • Service Area
  • Customer Service
Have questions about our methodology or company ratings? Reach out to FindAPro@TodaysHomeowner.com.

How Much Does Window Installation Cost In Islip?

Window installation and replacement costs will be influenced by several factors, including the materials you choose, how difficult your windows are to access or install, and the number and size of the windows. On average, Islip homeowners will spend about $290 per window*. Below are additional cost breakdowns. *Cost data based on sample pricing for window installation from multiple retailers and adjusted for local cost of living.

When To Replace Windows

Replacing your current windows with new energy-efficient ones can greatly boost your home's comfort, insulation, noise reduction, appearance, and value. Clear indicators it's time to invest in new windows include:

  • Cold air and drafts leaking in from old, loose-fitting windows.
  • Fogging between window panes, condensation issues, or rotting window frames allowing moisture intrusion into the home.
  • Windows that are hard to open, close, and lock properly due to wear and age.
  • Inefficient and outdated window styles that reduce your house's curb appeal.
  • A chilly house and high energy bills from poor insulation around windows.

How To Choose a Window Company

Hiring a qualified windows installation contractor is the key to a successful project. Below, we cover the main factors to consider when making your selection.

Experience

Look for reputable local companies with many years, ideally decades, of experience successfully installing all types of windows. These providers are more likely to understand Islip's climate and your requirements. Request references from recent clients to confirm the quality of a company's work.

Certifications

Choose an installer that’s accredited like major window manufacturers, and that has Fenestration and Glazing Industry Alliance (formerly AAMA) certification. Proper certification shows they've received proper training in installation best practices. Verify that installers are staff rather than subcontractors, and confirm that the technicians assigned to your job have certification.

Reputation

Spend time reading through online reviews, checking the Better Business Bureau (BBB), and asking for local references. Review customer feedback to verify that a company regularly provides good workmanship and customer service. Avoid companies with complaints of shoddy or unfinished work.

Process

The best window installers will supply a detailed project plan and schedule, clear expectations, and an overview of product and installation options. Avoid companies that offer ill-defined quotes or timelines that lack necessary details. Look for ongoing contact throughout the process to avoid surprises later in the project.

Warranties

Research window installers that back their installations with guarantees and provide warranties on labor and materials. This demonstrates confidence in their work. Opt for companies with unlimited lifetime warranties that can be transferred to new homeowners.

Materials

Verify that your window company works with long-lasting, durable brands, offers power-saving window options, and fits your budget. Look for window options with enhanced UV protection, design flexibility, and good energy ratings, and check whether the materials include their own manufacturer warranties.

Frequently Asked Questions About Window in Islip, NY

The ideal time to install windows in Islip is when temperatures are moderate, generally in the spring or fall. This enables professionals to work with less worry about extreme temperatures.

The ideal type of replacement windows for your Islip home depends on when your home was built –the average house in Islip was built around 1964. If your home was built a while ago, you may want to consider energy-efficient windows such as double-glazed windows, which are designed to keep your home cool in the summer and warm in the winter. Wood frames also have a classic look that's perfect for older homes. For newer homes, you can think about vinyl windows, which are affordable, durable and have a modern look.

The most expensive windows are double-hung windows. They are more complicated than single-hung windows, and so are more expensive. Single-hung windows are the cheapest on the market. In terms of frames, aluminum and vinyl are the most affordable options.

It depends on your budget and the condition of your windows. If your current windows are in reasonable condition, you might only replace the ones that really need to be replaced. If you're in an area with lower energy costs, you may be able to wait to replace all your windows.

In some cases, you can install your own windows, but it's recommended to hire a professional. It's important to consider the local climate when replacing windows, as it will have an effect on the process. For example, the temperatures in Islip can reach an average low of 49, so you need to consider energy-efficient windows that can protect from the cold. It's also important to measure correctly and understand the instructions for installation. Hiring a professional for your window replacement project will guarantee that everything is installed correctly.

Yes, many window companies provide financing options. Some installers offer low-interest loans, although you may not qualify if your income is on the higher end, while other companies provide special financing plans with terms and conditions that vary depending on the job.

Other Islip, NY Home Services

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