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Best Window Replacement Companies in Islip, NY

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Written By Max Peterson | Last Updated: February 05, 2024

You might be installing new windows to improve your home's appearance, lower your energy usage, or protect your home from inclement weather. Local contractors recognize that homeowners would rather not pay a fortune for window replacement in Islip. They work with innovative materials that don't sacrifice durability.

Top Pick
  • Full-service installation
  • Large window selection
  • Nearly 30 years of experience
Best Financing
  • Full-service installation
  • In-house, U.S.-made products
  • More than 70 years of experience
Most Customizable
  • Full-service remodeling
  • 96% satisfaction rate
  • More than 30 years of experience

Top 10 Islip Window Installation Companies

We recommend these local installers for your window replacement in Islip.

Islip residents can trust the This Old House Reviews Team to provide authoritative, up-to-date window company recommendations. To find out the best installers, we concentrate on these five traits:

  • Product quality
  • Customer reviews and recommendations
  • Professional experience and licensure
  • Energy-efficiency guarantees
  • Services and warranties

Window World of Long Island Logo

Window World of Long Island

Based on 338 customer reviews.

Services Offered

Custom Window Designs Bay Windows Sliding Glass Doors Double-Hung Window Install & Replacement Storm Doors


  • Free assessment
  • Timely service
  • Price transparency
33 Hempstead Tpke, Farmingdale, NY 516-377-3500 windowworldlongisland.com
Flawless Glass & Mirror LLC Logo

Flawless Glass & Mirror

Based on 27 customer reviews.

Services Offered

Window Repair Mirrors Window Install & Replacement Glass Showers


  • Educational website
  • Free assessment
  • Good customer service
1350 Lincoln Ave # 10, Holbrook, NY 631-275-0485 flawlessglassandmirror.com
Pro Quality Home Improvements Inc. Logo

Pro Quality Home Improvements

Based on 36 customer reviews.

Services Offered

Window Install & Replacement Window Repair Residential Windows Bay Windows Commercial Windows Energy-Efficient Options


  • Free assessment
  • Price transparency
  • Timely service
1120 Little East Neck Road, West Babylon, NY 631-393-6812 proqualityhomeimprovements.com
EcoView Windows of Long Island Logo

EcoView Windows of Long Island

Based on 34 customer reviews.

Services Offered

Window Install & Replacement Bay Windows Fiberglass Frames Sliding Glass Doors


  • Educational website
  • Price transparency
  • Good customer service
54 Enter Ln, Islandia, NY 631-538-4731 ecoviewwindowsli.com
Good Guys Contracting Logo

Good Guys Contracting

Based on 51 customer reviews.

Services Offered

Window Repair Marvin Aluminum Frames Window Install & Replacement Commercial Windows Bay Windows


  • Educational website
  • Free assessment
  • Good customer service
441 Broadway, West Babylon, NY 631-559-6420 goodguyscontracting.com
Tri State Window Factory Logo

Tri State Window Factory

Based on 122 customer reviews.

Services Offered

Window Install & Replacement Vinyl Frames Sliding Glass Doors


  • Price transparency
  • Good customer service
  • Free assessment
360 Marcus Blvd, Deer Park, NY 631-667-8600 tristatewindowfactory.com
Glass Doctor Logo

Glass Doctor

Based on 26 customer reviews.

Services Offered

Custom Glass Window Install & Replacement Glass Showers Sliding Glass Doors Mirrors Glass Repair Window Repair Commercial Windows


  • Good customer service
  • Price transparency
  • Educational website
354 Smithtown Blvd, Lake Ronkonkoma, NY 631-619-6711 glassdoctor.com
Four Seasons Sunrooms Logo

Four Seasons Sunrooms

Based on 283 customer reviews.

Services Offered

Commercial Windows Energy-Efficient Options Window Install & Replacement


  • Free assessment
  • Educational website
  • Price transparency
5005 Veterans Memorial Hwy, Holbrook, NY 631-443-4238 fourseasonssunroomsoflongisland.com
Renovate Right, Inc. Logo

Renovate Right

Based on 84 customer reviews.

Services Offered

Glass Showers Commercial Windows Window Install & Replacement


  • Price transparency
  • Timely service
  • Good customer service
455 East Dr, Copiague, NY 631-464-4868 renovaterightny.com

More Local Window Companies

Sayville Custom Mirrors Inc

User Reviews: 4.1/5 

251 W Main St
Sayville, NY 11782

Morningstar Doors and Windows, Inc.

User Reviews: 4.7/5 

215 Adams Blvd
Farmingdale, NY 11735

Home Services at The Home Depot

User Reviews: 4.4/5 

1101 Sunrise Hwy
Copiague, NY 11726

Mr. Handyman of Huntington and Smithtown

User Reviews: 4.7/5 

514 Larkfield Rd Suite 8
East Northport, NY 11731

Clear Image Glass & Mirror

User Reviews: 4.4/5 

2069-71 Middle Country Rd
Centereach, NY 11720

Center Island Contracting

User Reviews: 4.5/5 

95 Florida St
Farmingdale, NY 11735

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

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Facts about Islip
Annual Energy Efficient Windows Savings: $215
Average Max Temp: 55°F
Average Min Temp: 49°F
Average Daily Sunlight: 58%
Average Annual Snowfall: 25.4"
Average Monthly Precipitation: 3.90"

Expert Tips By

This Old House empowers homeowners with the knowledge and tools they need to tackle various projects and navigate the complexities of homeownership.

How To Choose a Window Company in Islip

With Islip's sheer size, you're sure to find a trustworthy window company that aligns with your values and preferences. As you make calls, keep the following factors in mind:

Window Cost by Type

Replacing your windows is a substantial investment, so balancing cost with performance is vital. Although top-of-the-line windows may cost more upfront, they often yield better long-term value due to their increased lifespan. The age of your home, in addition to the styles, materials, and sizes of windows you opt for, can impact pricing. Transom windows are inexpensive with their simple size and straightforward form factor, while a sweeping, custom-size picture window will cost more. It's advisable to speak with a vetted installer to determine your ideal options.

To help you form a rough estimate, this table shows the typical cost of the most common residential window types.

Window Types Average Cost
Arched $248-$1525
Awning $359-$1001
Bay $828-$6147
Custom $368-$1024
Casement $286-$1661
Double-hung $133-$865
Egress $245-$613
Glass Block $49-$621
Picture $215-$1593
Single-hung $97-$1639
Skylight $122-$1479
Sliding $282-$1434
Storm $58-$405
Transom $300-$628

Window Material Cost

Materials also help determine a window's cost. You might pick a material based on your energy efficiency goals, the local climate, and your desired look. For example, wood windows can give your home an organic design without breaking the bank, but you'll have to invest more toward maintenance. Aluminum and composite windows cost more up-front, but they're incredibly durable against the elements, so you'll spend far less on maintenance.

Window Types Average Cost
Aluminum $58-$1639
Composite $591-$1329
Fiberglass $97-$828
Vinyl $199-$1844
Wood $295-$1661

Other Window Replacement Costs

Your contractor will factor the price for your windows and the value of their services into its total estimate. Make sure to assess the cost of labor, warranties, and any other extra expenses that your project may require.

Experience and Training

The longer a window installer has served your area, the better its workmanship will likely be. Speak with a company representative to learn more about its guarantees, public and private credentials, and experience. Company websites often have photo galleries where you can see previous work technicians have done.

Licensing and Credentials

New York's state government doesn't issue contracting licenses for window installers, but this doesn't stop local governments from stepping in and establishing their own licenses. For example, to put in windows in New York City, a company must secure a Home Improvement Contractor License by passing exams and ecological assessments.

Types of Windows Offered

No two companies offer the same window designs and materials. Find one that specializes in the type you want for your home.

  • Awning
  • Bay
  • Bow
  • Casement
  • Crank-out
  • Custom
  • Double- or single-hung
  • Egress
  • Garden
  • Jalousie
  • Picture
  • Sliding
  • Skylight
  • Specialty
  • Storm
  • Transom
  • Vent
Also, check the kind of window framing materials a company works with. Each material has distinct price points, life spans, and energy performance capabilities. Common materials include aluminum, wood, vinyl, composite and fiberglass.

Customer Feedback

Perhaps the best way to vet window companies for your job is to find out what previous customers have said about them. You can find customer reviews on websites like Yelp, Google, the BBB, and Trustpilot. Referrals can also help you in your company search. Ask each company you're interested in for a list of references, and talk to family and friends about who they use for window installations.

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Frequently Asked Questions About Window Replacement in Islip

How could new windows help my energy efficiency?

Islip homeowners could potentially save $220 each year by upgrading to efficient windows. They'll also decrease their property's carbon dioxide emissions by 310 pounds per year.

According to the national Department of Energy, up to a third of a house's HVAC usage is to compensate for the heat or cold entering through windows. Energy-efficient windows help keep heat out in the summertime and retain heat in the wintertime, improving your comfort and furthering your dollar.

Are there tax incentives for installing energy-efficient windows?

Ultimately, the tax incentives you can claim are determined by the scope of your window replacement and your city. You can claim 30% of the value of new efficient windows as a federal tax credit, up to $3,200 per year, until 2032. We also encourage you to speak with your local building department for more information on tax breaks specific to your area.

Do window companies have guarantees or warranties for their work?

We strongly recommend choosing a window company that backs their work with a guarantee for your protection. These policies usually cover workmanship errors, manufacturer defects, and material flaws that appear after installation. Verify the warranty terms with a window company before working with it.

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

More Window Resources

National Windows Company Ranking Methodology


Energy Star