Window Replacement Long Island
We provide window installation across Long Island — Nassau County and Suffolk County — with thousands of windows installed since 2011. Vinyl double-hung, casement, bay, bow, and energy-efficient windows: every project comes with a Manual J fit check, all permits handled, and a 10-year workmanship warranty backed by our licensed crew.
For 2026 costs, permit requirements by town, and what to look for in a contractor, see our window installation Long Island guide.
BBB Accredited A+
Since 2011
Our Services
Window Solutions for Every Long Island Home
From vinyl double-hungs for your Cape Cod to custom bay windows for your colonial, we install every major window type and brand.
Window Types
Every Window Style Long Island Homes Need
From standard double-hungs to structural bay and bow installs — we handle every window type across Nassau and Suffolk County.
Double-Hung
Both sashes tilt in for easy cleaning. The standard choice for Long Island Cape Cods, ranches, and colonials. Multi-chamber vinyl cuts air infiltration up to 50% vs. older aluminum.
Casement & Awning
Crank-open design with the tightest seal of any operable window. Best for kitchens, bathrooms, and coastal homes where salt-air infiltration is a concern.
Bay & Bow Windows
3-panel bay ($1,800–$3,200) or 5-panel bow ($2,400–$4,800) installed. We handle structural header, seat board, roof cap, and permit filing in Nassau and Suffolk.
Learn moreEnergy-Efficient / Triple-Pane
U-factor 0.20–0.24. Qualifies for $600 federal IRA tax credit and PSEG LI rebates. Cuts heating bills 15–25% on most Long Island homes.
Learn moreWood-Clad Windows
Real wood interior, maintenance-free exterior cladding. Andersen 400, Pella Architect, and Marvin Elevate for Tudors and colonials in Great Neck, Garden City, and Roslyn.
Learn moreEgress & Specialty
NYS code requires 5.7 sq ft clear opening for basement egress. We handle foundation cutting, well installation, permit filing, and inspection coordination.
Why Long Island Is Different
Window Installation on Long Island: What Sets This Market Apart
The Housing Stock Problem
Nassau and Suffolk County were built out primarily between 1945 and 1975. That means a massive share of Long Island’s housing stock is now 50-80 years old — and most of those homes are on their second or third generation of windows. The original steel casements from Levittown’s 1947-1951 construction era are 70+ years old. The aluminum replacements installed in the 1980s are 40+ years old. Even the builder-grade vinyl units installed in the 1990s and early 2000s are now well past their useful life. Long Island has one of the highest window replacement rates per capita in the Northeast for this reason.
Salt Air and Coastal Exposure
Both the North Shore (Long Island Sound) and South Shore (Atlantic Ocean, Great South Bay) expose millions of Long Island homes to salt-laden air that destroys aluminum frames, corrodes hardware, and accelerates seal failure in double-pane units. Standard aluminum-frame windows on a waterfront Massapequa property can show visible corrosion within 8-12 years. Our coastal Long Island window installations use vinyl or aluminum-clad frames rated for salt-air environments, marine-grade flashing tape, and closed-cell spray foam insulation around every frame opening.
Long Island Window Installation by Home Type
Window Installation Cost by Town
Typical whole-house project, 12-18 windows.
PSEG & NYSERDA Incentives
Long Island homeowners can stack three incentive programs for maximum savings on qualifying Energy Star window installations:
We document product specs and walk through every application at installation. Energy Star Zone 4 specs: U-0.27 or lower, SHGC 0.40 or lower.
Our Window Installation Process
- 1Free in-home measurement — every opening measured twice
- 2Custom manufacturing to exact opening dimensions
- 3Permit filing with your Nassau or Suffolk town
- 4Professional installation: foam insulation, flashing tape, exterior caulk
- 5Final walkthrough + warranty registration
- 6Inspector coordination for permitted work
Nassau & Suffolk County
Window Installation Across Long Island
We know every permit office on the island. Here is what to expect by county.
Nassau County
Three building jurisdictions — Town of Hempstead, Oyster Bay, and North Hempstead — each with its own permit fee schedule. Like-for-like replacements are generally permit-exempt; bay and bow projects require a building permit ($150 filing + $75/window for 4+ replacements).
Predominantly 1940s–1960s Cape Cods, colonials, and ranches, with premium Tudors in Great Neck, Garden City, and Roslyn. Original aluminum frames corrode in Nassau's coastal climate within 15–20 years. We replace with vinyl or fiberglass frames sealed with closed-cell spray foam and marine-grade flashing tape.
Suffolk County
Five major town building departments: Babylon, Islip, Huntington, Smithtown, and Brookhaven — each processes window permits independently. Town of Babylon: $175 flat fee + inspection. Huntington and Smithtown: per-opening fee, ~$200 for a typical whole-house project. Brookhaven adds coastal overlay district requirements near Fire Island.
Waterfront communities on both shores require coastal-grade installations: stainless-steel hardware, impact-resistant glazing in flood zones, and frames rated for salt-air environments. PSEG LI rebates are stackable with NYSERDA and the federal IRA credit — up to $5,000 in total incentives on a qualifying 12-window project.
Homes Completed
In Business
Google Rating
Active Install Crews
Our Work
See the Transformation
Drag the slider to compare before and after on a recent whole-house window replacement in Smithtown.
Before
AfterGallery
Window Installations Across Long Island
Every project is a custom fit. Browse recent installations across Nassau and Suffolk counties.
Window Replacement Cost Guide
How Much Does Window Replacement Cost on Long Island?
Most Nassau and Suffolk County homeowners pay between $350 and $950 per window installed. Here’s what to expect by window type.
| Window Type | Typical Cost (installed) |
|---|---|
| Vinyl Double-Hung | $350 – $650 each |
| Casement Windows | $400 – $750 each |
| Bay & Bow Windows | $1,200 – $3,800 ea. |
| Energy-Efficient (Triple-Pane) | $550 – $950 each |
| Wood-Clad Windows | $700 – $1,400 each |
| Whole-House (16 windows) | $4,200 – $15,200 total |
Written itemized quote before any commitment. No hidden fees.
Energy-efficient windows qualify for up to $600 federal tax credit. We help you apply.
12-month 0% APR and low-rate plans up to 84 months. No prepayment penalty.
Customer Reviews
What Long Island Homeowners Say
4.9-star average across 604+ verified reviews on Google, Yelp, Angi, and BBB.
James and his crew replaced all 16 windows in our Levittown ranch in just two days. The difference in drafts is night and day. Our heating bill dropped by almost $200 a month last winter.
Karen M.
Levittown, NY
We got quotes from four companies for our bay window project. Window Company Long Island was the most transparent about pricing and the only one who showed up on time for the estimate.
Tom & Lisa R.
Massapequa, NY
Had 10 casement windows installed in our Huntington colonial. The crew was professional, cleaned up everything, and the windows look incredible. Already recommended them to two neighbors.
David P.
Huntington, NY
After the nor'easter damaged three of our windows, they came out the next day for an emergency assessment. New windows were installed within a week. Can't say enough good things.
Maria S.
Babylon, NY
We chose the Andersen 400 Series for our Garden City Tudor and they look absolutely perfect. The team understood the historic character of our home and matched everything beautifully.
Robert J.
Garden City, NY
Best home improvement decision we've made. The triple-pane windows they installed keep our house so quiet — you can't even hear the traffic on Hempstead Turnpike anymore.
Angela W.
East Meadow, NY
FAQ
Window Replacement Questions
Answers to the questions Long Island homeowners ask most about replacement windows, costs, and our process.
Service Areas
Window Replacement Across Long Island
We install windows across Nassau and Suffolk County. Click your town to see local pricing and project examples.
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Ready for New Windows?
Get a no-obligation quote from Long Island's trusted window replacement experts. Most estimates completed same day.
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