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Window Replacement

Bay & Bow Window Installation on Long Island

Bow and bay windows on Long Island — custom-sized, installed with structural support, and finished with your choice of copper, aluminum, or shingled roofing. A bay window uses three panels at 30- or 45-degree angles; a bow window uses four to six panels in a gentle curve. Both project 12–24 inches beyond your exterior wall, creating a window seat, reading nook, or display shelf while flooding the room with natural light. Window Company Long Island installs bow and bay windows across Nassau and Suffolk County with a free in-home estimate and written price before any work begins.

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Starting at $1,800 – $4,500 per window installed
Bay & Bow Window Installation on Long Island

Key Benefits

Why Choose Bay & Bow Windows?

Adds Usable Interior Space

Bay and bow windows project 12-24 inches beyond your exterior wall, creating space for a window seat, herb garden, display area, or reading nook without the cost of a full addition.

Panoramic Natural Light

Multiple glass panels at different angles capture light from three directions throughout the day, brightening rooms that felt dark with a single flat window.

Major Curb Appeal Boost

A bay or bow window is an immediate visual upgrade to your home's exterior. Real estate professionals consistently rank them among the top curb-appeal improvements for Long Island homes.

Structural Support Included

Every installation includes proper structural support — steel cables, knee brackets, or a full support platform — engineered for the weight and wind load specific to your home.

Energy-Efficient Glass

Each panel features low-E insulated glass with argon fill. The head and seat boards are insulated to prevent thermal bridging, and the roof section is fully weather-sealed.

Custom Sizing & Finishes

We build bay and bow windows to fit your exact opening. Choose copper, aluminum, or shingled roofing, with interior wood seat boards in oak, maple, or painted MDF.

Our Process

How Your Installation Works

1

Design Consultation

We visit your home to evaluate the wall structure, measure the opening, and help you choose between a bay (3 panels) or bow (4-6 panels) configuration, roofing material, and interior finishes.

2

Engineering & Fabrication

Our team verifies structural requirements, orders the custom window unit, and coordinates any carpentry or framing needed for the projection. Lead time is 4-6 weeks.

3

Installation Day

We remove the existing window, frame the new opening if needed, install structural support, set the bay or bow unit, insulate, flash, and install the roof section and interior trim.

4

Finish Work & Inspection

Interior seat board and casing are finished, exterior is caulked and sealed, and we perform a water test to verify the roof drainage. A final walkthrough ensures your complete satisfaction.

Bay & Bow Windows installation in progress on Long Island

Professional Installation

2,840+ windows installed across Long Island since 2011

Transparent Pricing

Bay & Bow Windows Cost on Long Island

Per Bay or Bow Window

$1,800 – $4,500

Bay and bow window installation on Long Island typically falls in the $1,800-$4,500 range per unit, depending on panel count, size, roof finish (copper/aluminum), and structural support needs. Final pricing is always confirmed by an in-home measurement.

Exact pricing depends on window size, glass options, and installation complexity. Get a precise quote for your home.

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Frequently Asked Questions

Bay & Bow Windows FAQs

A bay window has three panels: a large fixed center panel flanked by two operable windows set at 30- or 45-degree angles. A bow window has four to six panels arranged in a gentle curve, creating a more rounded appearance. Bay windows project farther from the wall and create a more defined shelf or seat, while bow windows offer a softer arc with a wider panoramic view.
Yes. Every bay and bow window installation requires proper structural support because the window projects beyond the exterior wall. Depending on the size and your home's construction, we use steel support cables anchored to the header, knee brackets mounted below the window, or a full support platform. The cost of structural support is included in our installation price.
Yes, this is one of our most popular projects. We remove the existing flat window, widen or adjust the rough opening as needed, add structural support, and install the bay or bow unit. The exterior is finished with a new roof section, siding returns, and flashing. No interior wall demolition is required for most installations.
We offer three roofing options: copper (premium look, develops a natural patina, lasts 50+ years), aluminum (durable, color-matched, maintenance-free), and shingled (matches your existing roof for a seamless look). Copper is the most popular choice for Long Island bay windows due to its durability and aesthetic appeal.
A single bay or bow window installation typically takes one full day, from removal of the old window to completed trim work. If structural modifications are needed — such as widening the opening or adding a support header — the project may extend to two days. We complete all work before leaving your home weather-tight.
We install bow and bay windows across all of Long Island, including every town in Nassau County and western Suffolk County. Our showroom and warehouse are in Massapequa, and our crews travel to every community from Valley Stream to Commack. We carry bay and bow units from Andersen, Pella, Marvin, and premium vinyl manufacturers, all custom-sized to your opening. Free in-home consultations are available six days a week.
Bay window installation on Long Island typically costs $1,800 to $3,500 per unit, while bow windows with 4-6 panels run $2,500 to $4,500. The bay window cost on Long Island depends on panel count, frame material (vinyl vs. wood-clad), glass package, roofing finish (copper, aluminum, or shingled), and whether structural modifications are required. We provide free, itemized written estimates with no hidden fees so you know the exact bay window cost before any work begins.
Yes. Modern energy efficient bow windows feature dual- or triple-pane insulated glass with low-E coatings and argon gas fill that block UV rays and reduce heat transfer. We install energy efficient bow windows in Nassau County and Suffolk County homes with fully insulated head boards, seat boards, and roof sections to eliminate thermal bridging. Many of the bay and bow window units we install are Energy Star certified and may qualify for NYSERDA rebates, lowering your overall project cost.
Absolutely. Bow window replacement is one of our most common projects. We remove the existing bow or bay unit, inspect the framing and structural support, and install a new custom-sized window in the same opening. If the original support system is outdated, we upgrade it to meet current building codes. A straightforward bow window replacement is typically completed in one day, and your home stays weather-tight throughout the process.
We offer bow and bay windows on Long Island in a wide range of configurations. Bay windows come in 30-degree and 45-degree projections with three panels, while bow windows use four to six panels in a gentle curve. Frame options include maintenance-free vinyl, wood-clad (Andersen, Pella, Marvin), and fiberglass. You can choose casement, double-hung, or fixed panels, and we offer interior finishes in oak, maple, cherry, or painted MDF. Every unit is custom-built to fit your exact opening.
Yes. Bow and bay windows are consistently ranked among the highest-ROI exterior upgrades for Long Island homes. They add architectural character, increase natural light, and create usable interior space — all features that appeal to buyers in Nassau County and Suffolk County. Real estate professionals report that a well-installed bay or bow window can recoup 60-80% of its cost at resale, and the curb appeal boost can help a home sell faster in competitive Long Island neighborhoods.

Customer Reviews

What Long Island Homeowners Say

The bay window in our living room completely transformed the space. We went from a dark, flat wall to a bright, open room with a gorgeous window seat. The copper roof is a beautiful detail. WCLI handled every aspect of the project perfectly.

Susan R.

Rockville Centre, NY

Had a 5-panel bow window installed in our dining room. The amount of light that comes in now is unbelievable. The crew was meticulous with the trim work and the insulated seat board is a nice touch. Worth every penny.

Michael T.

Smithtown, NY

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