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 Installation Long Island — Nassau & Suffolk County
Window installation on Long Island covers two of the most distinct housing markets in the Northeast. Nassau County towns — Hempstead, Garden City, Great Neck, Levittown, and Massapequa — run from postwar Cape Cods and ranches to high-end colonials and Tudors in historic districts. Suffolk County towns — Babylon, Huntington, Smithtown, and Islip — add large split-levels, waterfront homes, and newer construction that all carry their own window challenges. We handle window installation long island homeowners across both counties rely on, with licensed crews who know every municipal permit office from the Queens border to the Hamptons. We install every major window brand trusted by Long Island contractors: Andersen, Pella, Marvin, Harvey, and Simonton. Window types we install include double-hung, casement, bay, bow, sliding, and egress windows. Long Island’s salt air and nor’easter exposure demand vinyl or fiberglass frames with marine-grade glazing — not the aluminum frames that corrode on South Shore and North Shore waterfront homes within a decade. Our coastal window installation process uses closed-cell spray foam, marine-grade flashing tape, and frames rated for coastal environments. Whether you need window installation long island wide or a single egress window in a finished basement, we provide a free in-home estimate within 48 hours across all of Nassau and Suffolk County.
Ready to move forward? See our full window installation on Long Island process — pricing by town, brand comparisons, and what to expect on installation day.
Window Installation Guide
Window Installation on Long Island
Choosing the right replacement windows for your Long Island home starts with understanding the options. Our window installation crew works with every major window type across Nassau and Suffolk counties, from postwar Cape Cods in Levittown to waterfront colonials in Cold Spring Harbor.
Double-Hung Windows
The most popular choice for Long Island window replacement. Both sashes tilt inward for easy cleaning, and modern vinyl double-hungs feature multi-chamber frames that cut air infiltration by up to 50% compared to older aluminum units. Ideal for colonials, ranches, and split-levels across the island.
Casement & Awning Windows
Casement windows crank open outward, creating the tightest seal of any operable window style. They are perfect for kitchens and bathrooms where maximum ventilation matters. Awning-style windows hinge at the top and are often paired above fixed picture windows.
Bay & Bow Windows on Long Island
Bay windows project outward with three panels — typically a large fixed center glass flanked by two operable casements or double-hungs — while bow windows use four or five panels in a gentle curve. Both styles push living space outward, flood the room with natural light, and add exterior curb appeal that flat walls simply can't match.
Bay and bow windows are among the most popular upgrade projects on Long Island for a reason: the region's postwar ranches, Cape Cods, and colonials were built with utilitarian, single-pane windows that never took advantage of the yard views. A 10-foot bay unit in a dining room or living room transforms how the space feels. Nassau County homes in Garden City, Mineola, and Massapequa install them at high rates — so do Suffolk County colonials in Huntington, Smithtown, and Commack.
Installation of bay and bow windows on Long Island involves removing the existing opening, building a structural header to carry the new load, framing the seat board and roof cap, and weatherproofing the exterior with marine-grade flashing. Most Long Island municipalities require a permit for bay and bow window projects because they involve structural modifications. We handle the permit filing. Installed cost for a standard 3-panel vinyl bay window in Nassau or Suffolk County runs $1,800 to $3,200; bow windows (5-panel) run $2,400 to $4,800. Premium wood-clad units from Andersen or Marvin start at $3,200 for a bay and $4,500 for a full bow. Nassau County permit fees for a bay or bow project run $150–$225 depending on the municipality; Suffolk County towns vary from $175 (Town of Babylon flat fee) to $200–$300 in Huntington and Smithtown. The permit is typically processed in 5–10 business days. We handle all filings and inspections at no extra cost, and our crews are trained specifically on coastal flashing details — critical for Long Island homes near the water where improper bay window installation leads to rot within 5 years.
Vinyl vs. Wood-Clad: Choosing the Right Material
Vinyl windows dominate Long Island installations because they resist salt air, never need painting, and cost significantly less than wood alternatives. Wood-clad windows (Andersen, Pella, Marvin) offer a real-wood interior with a maintenance-free exterior shell — the preferred choice for Tudors, colonials, and homes in historic districts like Garden City and Roslyn.
Energy Star Ratings & Tax Credits
All windows we install meet or exceed Energy Star requirements for the Northern climate zone (Zone 4). Triple-pane options with dual low-E coatings and argon gas fill deliver the highest efficiency and qualify for up to $600 in federal energy tax credits. Homeowners on Long Island typically see a 15-30% reduction in heating and cooling costs after a full-house window replacement.
What Does Window Installation Cost on Long Island?
Most Long Island homeowners pay between $400 and $1,200 per window installed, depending on the window type and frame material. Standard vinyl double-hungs start around $350 installed, while premium wood-clad bay windows can reach $3,800. A typical whole-house project of 12-16 windows runs $4,200 to $15,200. We provide free, itemized estimates with no hidden fees so you know exactly what to expect before we start.
Picture & Sliding Windows
Picture windows are fixed panes that maximize natural light and views — ideal for Long Island waterfront homes in Port Washington, Northport, and Cold Spring Harbor. Sliding windows glide horizontally on a track and work well in rooms where an outward-opening casement would interfere with walkways or decks. Both styles are available in vinyl, fiberglass, and wood-clad frames from Andersen, Pella, and Harvey.
Fiberglass & Aluminum-Clad Windows
Fiberglass frames (like the Andersen 100 Series Fibrex or Pella Impervia) offer the strength of wood with the low maintenance of vinyl. They expand and contract at nearly the same rate as glass, which means tighter seals over time. Aluminum-clad wood windows pair a real wood interior with a factory-painted aluminum exterior shell that resists salt air, UV fading, and moisture — making them the top choice for Long Island coastal homes where beauty and durability must coexist.
Brands We Install: Andersen, Pella, Marvin & Harvey
We are certified installers for the four most trusted window brands on Long Island. Andersen (100, 200, 400, A-Series) delivers the widest range from budget Fibrex to premium wood-clad. Pella (250 Series, Lifestyle, Architect) offers built-in blinds, integral security sensors, and proprietary Duracast fiberglass. Marvin (Elevate, Signature, Essential) is the go-to for custom sizes and historic millwork matching. Harvey (Tribute, Classic, Slimline) is a Northeast regional brand with fast lead times and excellent value for standard sizes.
Energy Performance: U-Factor, SHGC & Air Leakage
Every replacement window we install carries an NFRC-certified label showing three critical performance metrics. U-factor measures heat transfer — lower is better; we recommend 0.27 or below for Long Island (DOE Northern Zone 4). SHGC (Solar Heat Gain Coefficient) indicates how much solar radiation passes through — a balanced 0.25-0.35 range minimizes summer cooling loads while still admitting free winter heat. Air leakage should be 0.30 cfm/ft or lower. All triple-pane windows we install exceed these thresholds, qualifying for the federal energy tax credit (up to $600/year) and NYSERDA incentives.
Long Island Building Codes & Permits for Windows
Window replacement on Long Island falls under the New York State Residential Code (IRC 2020 as adopted by NY). Key requirements include: egress windows in bedrooms must provide a minimum 5.7 sq ft clear opening (20″ minimum width, 24″ minimum height); tempered safety glass is required within 24″ of a door, within 18″ of the floor, and in bathrooms; energy performance must meet or exceed IECC Climate Zone 4 minimums (U-0.30, SHGC per orientation). Nassau County municipalities (Hempstead, North Hempstead, Oyster Bay) and Suffolk County towns each have slightly different permit processes and fees — we determine exact requirements at your free estimate and handle all filings and inspections at no extra cost.
Our Long Island Window Installation Process
Every window installation project we handle on Long Island follows a proven four-step process: free in-home measurement, custom manufacturing to your exact opening dimensions, professional installation with foam insulation and flashing tape, and a final walkthrough with warranty registration. We pull all permits in Nassau and Suffolk County municipalities and coordinate every inspection. Most full-house replacement projects of 12-16 windows are completed in 1-2 days. Our crews are W-2 employees — never subcontractors — and every job includes our 10-year workmanship warranty on top of the manufacturer’s lifetime warranty.
Window Installation on Long Island
Looking for window installation on Long Island? We’ve installed 1,000+ windows across Nassau County and Suffolk County since 2011. Our licensed crews handle double-hung, casement, bay, bow, and sliding windows from brands like Andersen, Pella, Marvin, and Simonton. Every project comes with a free in-home estimate, all permits filed, and a 10-year workmanship warranty. Window installation Long Island — see our full process and pricing.
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
Window Installation Nassau County
Nassau County covers three distinct building jurisdictions — the Town of Hempstead, Town of Oyster Bay, and Town of North Hempstead — each with its own permit office and fee schedule for window work. In the Town of Hempstead, a like-for-like window replacement in the same rough opening is generally permit-exempt; however, bay and bow window projects that alter the structural opening require a building permit ($150 filing plus $75 per window for four or more replacements). The Town of Oyster Bay follows similar thresholds. Incorporated villages like Garden City, Great Neck, and Mineola operate their own permit offices with independent fee schedules. We determine exact permit requirements at the free in-home estimate for every Nassau County address.
Nassau County's housing stock is predominantly 1940s–1960s Cape Cods, colonials, and ranch-style homes, with premium Tudors and Georgians in Great Neck, Garden City, and Roslyn. The original single-pane aluminum-frame windows in these homes fail fast in Nassau's coastal climate — aluminum corrodes, seals fail, and drafts develop within 15–20 years. We replace them with vinyl, fiberglass, or wood-clad units rated for coastal environments, sealed with closed-cell spray foam and marine-grade flashing tape. Nassau County window installation pricing: double-hung vinyl $350–$750 installed per window; bay windows $1,800–$3,200; whole-house project of 15 windows runs $6,500–$14,000 including permits.
PSEG Long Island's weatherization rebate program covers Nassau County homeowners upgrading to Energy Star-qualified windows: $50–$150 per window, stackable with the federal IRA tax credit of up to $600/year. We document all product specs and help you file both applications at installation.
Window Installation Suffolk County
Suffolk County is Long Island's largest county and covers five major town building departments: Town of Babylon, Town of Islip, Town of Huntington, Town of Smithtown, and Town of Brookhaven. Each processes window permits independently. The Town of Babylon charges a $175 flat fee plus inspection; Huntington and Smithtown both use a per-opening fee that tops out at approximately $200 for a typical whole-house replacement. Brookhaven is the most complex, with eight hamlets and varying requirements for coastal overlay districts near the Fire Island National Seashore and Wading River.
PSEG Long Island's Suffolk County weatherization rebatesare among the most generous on the East Coast: $50–$150 per Energy Star window, with a program cap of $1,500 per household per calendar year. Combined with NYSERDA's Clean Energy incentive ($200–$600 per window) and the federal IRA energy tax credit ($600/year for qualifying windows), a Suffolk County homeowner replacing 12 windows can recover $2,500–$5,000 in incentives on a qualifying project. We handle all documentation and application assistance at no charge.
Suffolk County's waterfront communities — Huntington Harbor, Northport, Cold Spring Harbor on the North Shore; Bay Shore, Babylon, Lindenhurst, and Amityville on the South Shore — require coastal-grade window installations with stainless-steel hardware, impact-resistant glazing in flood zones, and frames rated for the high-humidity, salt-air environment. We specify accordingly. Suffolk County window installation pricing: double-hung vinyl $320–$700 per window; casement $420–$950; bay windows $1,700–$3,000; whole-house project of 15 windows runs $5,500–$13,000 depending on window type and town permit fees.
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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.
Replacement Windows Long Island
Replacement Windows on Long Island — 2026 Cost Guide
Replacement windows on Long Islandare the most common home improvement project in Nassau and Suffolk County after kitchen remodels — because the housing stock is old and the original windows are not. Homes built between 1940 and 1990 (which covers the vast majority of Long Island's residential stock) frequently still have their original aluminum or steel single-pane windows, or the vinyl windows installed in the 1990s that have reached end-of-life at 20–25 years old.
Replacement windows in Long Island homes are installed as "pocket replacements" or "full-frame replacements" depending on condition. A pocket replacement drops a new window unit into the existing frame — faster, less disruptive, lower cost. A full-frame replacement removes the entire frame down to the rough opening and installs new — required when the existing frame has rot, water damage, or failed sealant. Long Island's salt-air coastal environment accelerates frame deterioration for both wood and aluminum, making full-frame replacement more common here than inland markets.
Replacement window cost on Long Island in 2026, installed, per window:
| Window Style | Per Window (Installed) | Energy Star | Best Application |
|---|---|---|---|
| Double-hung vinyl | $450–$850 | Available (U-factor ≤0.30) | Most LI bedrooms, living rooms |
| Casement vinyl | $520–$980 | Available | Kitchen over sink, maximum ventilation |
| Bay window vinyl | $1,800–$4,200 | Available | Living room focal point |
| Fiberglass double-hung | $750–$1,400 | Yes (superior thermal) | Coastal LI, salt-air areas |
| Sliding window vinyl | $420–$780 | Available | Basement, garage, horizontal spans |
| Picture window vinyl | $380–$720 | Available | Fixed light, view maximization |
Long Island 2026 installed pricing. Pocket replacement assumed. Full-frame replacement adds $100–$300 per window. PSEG LI Energy Star rebates available — ask about current rebate amounts at time of estimate.
Double-Hung vs Casement Windows Long Island
Double-Hung vs. Casement Windows — Which is Right for Your Long Island Home?
The most common question Long Island homeowners ask when choosing replacement windows is whether to match the original double-hung style or upgrade to casement. The answer depends on what each window is doing in the house.
Double-hung windows open by sliding the sashes vertically — top sash down or bottom sash up. They are the original style in most Long Island homes and the default choice for bedroom windows, dining rooms, and any space where you want the flexibility to open either half. Modern double-hungs tilt in for cleaning, making them viable for second-floor applications.
Casement windows are hinged at the side and crank open outward. They seal tighter than double-hungs because the hardware compresses the sash against the frame — resulting in better U-factor and air infiltration performance. They are the right choice for kitchen windows over the sink (crank open without reaching over the countertop), any window where maximum ventilation is the goal, and coastal Long Island applications where the tighter seal reduces salt-air infiltration.
We can mix styles in a single replacement project — double-hung in bedrooms, casement in the kitchen, picture windows where ventilation isn't needed. A combination strategy maximizes performance for each location without paying casement prices across the whole house.
PSEG LI Energy Star Window Rebates — Long Island 2026
PSEG Long Island offers rebates for Energy Star certified replacement windows installed in Nassau and Suffolk County homes through the PSEG LI Residential Programs. Energy Star windows for Climate Zone 5 (New York State) must meet: U-factor ≤ 0.30 and Solar Heat Gain Coefficient (SHGC) ≤ 0.40.
Current PSEG LI rebate program: $2 per square foot of window area replaced with Energy Star-certified windows. A typical 10-window replacement averaging 10 sf per window yields $200 in rebates. The rebate is modest relative to the total project cost but is stackable with any federal tax credit for which your windows qualify under the Inflation Reduction Act (up to 30% of project cost, up to $600 for windows, as of 2026 — confirm current limits with a tax advisor).
We register every qualifying window replacement for PSEG LI rebates at no additional cost. The utility requires the contractor to submit the rebate application with a copy of the Energy Star product certification — we handle that paperwork and deliver the signed rebate form to the homeowner within 30 days of project completion.
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