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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.

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Licensed & Insured4.9 Google Rating2,840+ Projects

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Since 2011

Licensed & InsuredNassau HIC #H2203150000
4.9 Stars387+ Google Reviews
Energy Star Certified PartnerCertified Partner
2,840+ HomesSince 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.

Vinyl Double-Hung Windows

Vinyl Double-Hung Windows

The most popular replacement window on Long Island. Tilt-in sashes, low-E glass, and lifetime warranty.

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Casement Windows

Casement Windows

Crank-open design with the tightest seal of any operable window. Perfect for kitchens and bathrooms.

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Bay & Bow Windows

Bay & Bow Windows

Statement windows that add space, light, and curb appeal. Custom-sized to your opening.

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Energy-Efficient Windows

Energy-Efficient Windows

Triple-pane glass with dual low-E coatings. Cut heating bills up to 30%.

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Wood-Clad Windows

Wood-Clad Windows

Real wood interior with maintenance-free exterior cladding. Andersen, Pella, and Marvin options.

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Window Repair

Window Repair

Foggy glass, broken hardware, or failed seals? We repair all brands and styles across Long Island.

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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.

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Energy-Efficient / Triple-Pane

U-factor 0.20–0.24. Qualifies for PSEG LI rebates. Cuts heating bills 15–25% on most Long Island homes.

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Wood-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.

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Egress & Specialty

NYS code requires 5.7 sq ft clear opening for basement egress. We handle foundation cutting, well installation, permit filing, and inspection coordination.

See Our Full Installation Process

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

Levittown / Wantagh Cape Cods
Original steel casements → vinyl double-hung. Dormer windows often need custom sizing.
Hicksville / Bethpage Bi-levels
Multiple small windows across split levels. Stairwell windows require specialty sizing.
Smithtown / Huntington Colonials
20+ windows common. Premium brands (Andersen, Pella) match the neighborhood character.
Massapequa / Seaford South Shore
Salt-air rated frames required. Impact-rated glass for bay-adjacent flood zones.
Great Neck / Manhasset North Shore
Wood-clad Andersen 400 or Marvin for period Tudors and colonials. Custom arch tops.
Freeport / Lindenhurst Waterfront
High wind-load rated frames. Marine hardware. Impact laminated glass recommended.

Window Installation Cost by Town

Levittown / East Meadow$5,500 – $12,000
Smithtown / Commack$7,000 – $16,000
Massapequa / Wantagh$6,000 – $14,000
Great Neck / Manhasset$14,000 – $32,000
Huntington / Bay Shore$7,500 – $18,000

Typical whole-house project, 12-18 windows.

PSEG & NYSERDA Incentives

Long Island homeowners can stack two incentive programs for maximum savings on qualifying Energy Star window installations:

PSEG Long Island rebate$50–$150/window
NYSERDA Clean Energy$200–$600/window
Federal tax credit (IRA)Ended after 2025

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

  1. 1Free in-home measurement — every opening measured twice
  2. 2Custom manufacturing to exact opening dimensions
  3. 3Permit filing with your Nassau or Suffolk town
  4. 4Professional installation: foam insulation, flashing tape, exterior caulk
  5. 5Final walkthrough + warranty registration
  6. 6Inspector coordination for permitted work
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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.

Typical pricing (installed)
Double-hung vinyl$350–$750 ea.Bay window$1,800–$3,20015 windows (whole house)$6,500–$14,000
All Nassau County towns

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 incentives. The federal IRA credit for windows ended after 2025.

Typical pricing (installed)
Double-hung vinyl$320–$700 ea.Casement$420–$950 ea.15 windows (whole house)$5,500–$13,000
All Suffolk County towns
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Our Work

See the Transformation

Drag the slider to compare before and after on a recent whole-house window replacement in Smithtown.

Old drafty windows on a Smithtown colonial before replacementBefore
New vinyl double-hung windows installed on a Smithtown colonialAfter
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Gallery

Window Installations Across Long Island

Every project is a custom fit. Browse recent installations across Nassau and Suffolk counties.

Colonial home with new double-hung windows, Long Island
Bay window installation on Cape Cod home
Modern casement windows on contemporary renovation
Energy efficient triple-pane window closeup
Bow window with five panels on brick colonial
Before and after ranch home window replacement
Picture window installation on waterfront home
Wood-clad Andersen windows on luxury estate
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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 TypeTypical 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
Free detailed estimates

Written itemized quote before any commitment. No hidden fees.

PSEG & NYSERDA rebates

The federal tax credit for windows ended after 2025. Ask us about current utility rebates.

0% financing available

12-month 0% APR and low-rate plans up to 84 months. No prepayment penalty.

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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

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FAQ

Window Replacement Questions

Answers to the questions Long Island homeowners ask most about replacement windows, costs, and our process.

Bow and bay windows on Long Island range from $1,800 to $4,800 installed depending on size, frame material, and glass package. A standard 3-panel vinyl bay window (the most common choice) runs $1,800–$3,200 installed in Nassau or Suffolk County. A 5-panel bow window in vinyl costs $2,200–$3,800; premium fiberglass or wood-clad Andersen or Pella bow windows run $3,500–$4,800+. All bow and bay windows on Long Island require a structural permit for the header modification — we handle all filings and inspections at no extra charge. Nassau permit fees are $150 plus $75 per window; Suffolk varies by town. Our bow and bay window service includes free in-home measurements, permit coordination, professional installation, and a 10-year workmanship warranty.
Yes — bow and bay windows Long Island homeowners order are one of our most popular projects. A bay window uses three panels set at 30 or 45 degrees, while a bow window uses four to six panels in a gentle curve. Both project outward from the exterior wall, creating a window seat or reading nook and flooding the room with light. We install bow and bay windows on Long Island across all of Nassau and Suffolk County — vinyl, fiberglass, Andersen, Pella, and Marvin. Installed cost runs $1,800–$3,200 for a standard bay (3-panel vinyl) and $2,400–$4,800 for a bow (5-panel). All bow and bay windows on Long Island require a building permit for the structural header modification — we handle the filing. See our full bay and bow window service page for specs and pricing.
Window installation on Long Island typically runs $350 to $850 per window installed for a standard double-hung mid-grade vinyl unit. A whole-home replacement on a typical 15-window Long Island colonial averages $8,500 to $18,000 installed. Nassau County permit fees run about $150 to file plus $75 per window for projects of four or more windows. Suffolk County varies by town — Babylon charges a $175 flat fee plus inspection. We provide free, itemized estimates with no hidden fees.
Nassau County homeowners typically pay $400 to $950 per window installed, depending on window style and frame material. Vinyl double-hung windows are on the lower end; premium wood-clad Andersen or Pella units cost more. Nassau permit fees are $150 filing plus $75 per window for four or more replacements. A whole-house project of 12 to 16 windows in Nassau runs $5,500 to $14,000 installed including permits.
The best Long Island window company for your project is one that pulls permits, uses its own W-2 install crews (not subcontractors), and provides a written workmanship warranty. We are licensed in both Nassau and Suffolk counties, carry full liability and workers' comp insurance, and back every installation with a 10-year workmanship warranty plus lifetime manufacturer coverage. We install Andersen, Pella, Harvey, Simonton, and Alside windows — all major brands — and provide free in-home estimates.
When looking for a local window installation company on Long Island, check for a Nassau or Suffolk HIC license number, verify they pull permits, and confirm they carry liability insurance and workers' comp. We serve all of Nassau and western Suffolk County and can typically schedule a free estimate within 48 hours. Our office is based in Hicksville, giving us fast response times across most of Nassau County and into Huntington, Babylon, and Smithtown in Suffolk.
Yes. We are a certified Andersen installer and carry the full Andersen product line including the 100 Series (Fibrex composite), 200 Series (vinyl), and 400 Series (wood-clad). The Andersen 400 Series is the most popular premium option for North Shore Nassau homes — Great Neck, Manhasset, and Port Washington colonials and Tudors. The 200 Series is the best-value Andersen choice for most standard Long Island homes. We also install Pella, Harvey, and Simonton windows.
A single window replacement takes 1 to 2 hours. A typical whole-house project of 10 to 16 windows is completed in 1 to 2 days. Larger homes with 20 or more windows usually take 2 to 3 days. We schedule installations to minimize disruption and always clean up at the end of each working day.
Nassau County permit requirements vary by municipality. A like-for-like replacement in the same rough opening is often permit-exempt in towns like Hempstead and Oyster Bay. Nassau filing fees run $150 plus $75 per window for four or more replacements when a permit is required. In Suffolk, the Town of Babylon charges a $175 flat fee plus inspection; other Suffolk towns vary. We determine exact permit requirements during the free estimate and handle all filings at no extra cost.
Yes. Long Island homeowners can combine multiple incentive programs for window replacement. NYSERDA's Clean Energy program offers $200 to $600 per window for qualifying ENERGY STAR windows. PSEG Long Island's rebate program provides an additional $50 to $150 per window. The federal energy tax credit for windows ended after 2025, so it does not apply to 2026 installs. We document product specs and walk you through every application at installation.
U-factor measures how well a window insulates against heat loss — the lower the number, the better it insulates. For Long Island (DOE Zone 4), Energy Star requires U-factor of 0.30 or below; our triple-pane options deliver 0.20 to 0.25. SHGC (Solar Heat Gain Coefficient) measures how much solar heat passes through the glass — a value around 0.25 to 0.35 is ideal for Long Island because it blocks summer overheating while still admitting free passive solar heat in winter. We review both metrics during your estimate and recommend the optimal glazing for each window's orientation.
Yes. We install fiberglass-frame windows including the Andersen 100 Series (Fibrex composite), Pella Impervia (pultruded fiberglass), and Marvin Essential (proprietary fiberglass). Fiberglass expands and contracts at nearly the same rate as glass itself, which means the seal between frame and pane stays tighter over decades compared to vinyl. Fiberglass is especially popular on coastal Long Island homes where dimensional stability and salt-air resistance matter most.
Yes. We provide window installation across all of Long Island, covering Nassau County and Suffolk County. Our licensed crews serve every town from Valley Stream and Hempstead in Nassau to Huntington, Smithtown, Babylon, and Islip in Suffolk. Free in-home estimates are available Monday through Saturday with scheduling typically within 48 hours. Most full-house window installation projects are completed in 1–2 days.
We install all major window brands across Long Island: Andersen (100, 200, 400, and E-Series), Pella (250 Series, Lifestyle, and Architect), Marvin (Elevate, Signature, and Essential), Harvey (Tribute, Classic, and Slimline), and Simonton. We are certified installers for both Andersen and Pella, meaning our crews are factory-trained and your manufacturer warranty is fully backed. We'll recommend the right brand for your home's architecture, budget, and energy goals.
Window installation on Long Island typically runs $400 to $1,200 per window for standard vinyl double-hung replacements. Casement windows run $500 to $1,400 each. Bay windows (3-panel) range from $1,800 to $3,800 installed. A full-house project of 15 windows typically costs $6,000 to $18,000 depending on window type, frame material, and glass package. We provide free, itemized written estimates with no hidden fees and no pressure.
Yes. Nassau County window installation is a large part of our work. We serve every town and village across Nassau — Hempstead, North Hempstead, Oyster Bay, Garden City, Great Neck, Levittown, Massapequa, Hicksville, Farmingdale, Bellmore, Merrick, and more. We know Nassau permit requirements well and handle all filings and inspections at no extra cost. Nassau permit fees run $150 filing plus $75 per window for projects of four or more replacements.
Yes. Egress window installation is one of our most requested services on Long Island. New York Residential Code (Section R310) requires any finished basement bedroom or sleeping area to have at least one operable emergency escape window providing 5.7 sq ft of clear opening area. We handle the full job: foundation cutting, excavation, window unit, corrugated steel well, gravel drainage, well cover, permit filing, and final inspection coordination. Most Long Island egress window installations are completed in 1–2 days.
For Long Island homes exposed to salt air — particularly South Shore (Atlantic Ocean, Great South Bay) and North Shore (Long Island Sound) properties — vinyl or fiberglass frames with marine-grade hardware are the best choice. Standard aluminum frames corrode within 8–12 years in coastal zones. We install vinyl double-hung and casement windows rated for salt-air environments, and we use closed-cell spray foam insulation and marine-grade flashing tape at every frame opening. Andersen Fibrex composite and Pella Impervia fiberglass are our top picks for waterfront homes in Massapequa, Freeport, Bay Shore, Port Washington, and Northport.
A single window replacement on Long Island takes 1–2 hours per opening. A typical whole-house project of 12–16 windows is completed in 1–2 days with our full crew. Larger homes with 20+ windows take 2–3 days. Bay and bow window installations take longer — 4–8 hours per bay unit because the structural header, seat board, and roof cap must all be built and weatherproofed in the same visit. Permit coordination adds 5–15 business days in Nassau County before work can begin on permitted projects (bay/bow windows or structural changes). We schedule installations to minimize disruption and always clean up at the end of each working day.
In Nassau County, a like-for-like window replacement in the same rough opening is typically permit-exempt under Town of Hempstead and Town of Oyster Bay codes — no structural changes, no opening modifications. However, bay windows, bow windows, egress window additions, and any project that alters the rough opening size or the structural header requires a building permit. Nassau permit fees run $150 filing plus $75 per window for projects of four or more openings. We determine exact requirements at your free in-home estimate and handle all Nassau County permit filings at no extra cost.
The most energy-efficient windows for Long Island winters are triple-pane units with dual low-E coatings, argon or krypton gas fill, and warm-edge spacers — delivering a U-factor of 0.20 to 0.24 (vs. 0.27 required for Energy Star Northern Zone 4). On Long Island, where heating degree days average 4,800–5,200 per year, upgrading from original single-pane aluminum windows to triple-pane Energy Star units reduces heat loss through windows by 60–70% and typically cuts heating bills by 15–25%. Top-performing options for Long Island: Andersen 400 Series triple-pane, Pella Architect Series triple-pane, and Marvin Elevate triple-pane. All qualify for PSEG Long Island rebates ($50–$150/window). The federal IRA energy tax credit ended after 2025.
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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.

Window Replacement HempsteadWindow Replacement LevittownWindow Replacement MassapequaWindow Replacement HicksvilleWindow Replacement Port WashingtonWindow Replacement Great NeckWindow Replacement ManhassetWindow Replacement HuntingtonWindow Replacement SmithtownWindow Replacement BabylonWindow Replacement Bay ShoreWindow Replacement CommackWindow Replacement FarmingdaleWindow Replacement East MeadowWindow Replacement Lindenhurst
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