Window Replacement
Window Installation Long Island — Nassau & Suffolk County Contractor
Professional window installation on Long Island for Nassau and Suffolk County homeowners. With 850+ windows installed across Long Island by our licensed, ENERGY STAR certified crews, we handle every window type — double-hung, casement, bay, bow, sliding, and egress — with permits, flashing, and inspections managed from start to finish. Whether you're replacing aging aluminum sliders on a 1963 split-level in Wantagh, upgrading to bay windows in a Garden City colonial, or installing energy-efficient casements in a Smithtown center-hall, our Nassau and Suffolk County window installation team delivers on time, on budget, and fully permitted. Most Long Island homeowners pay $400–$1,200 per window installed. A full-house project of 15 windows runs $6,000–$18,000 depending on window type and frame material.
Window Installation Long Island — Nassau & Suffolk County
Window installation on Long Island covers a wide range of styles suited to the region's diverse housing stock. Double-hung windows remain the top choice for Levittown ranches and Smithtown colonials — both sashes tilt in for easy cleaning and multi-chamber vinyl frames cut air infiltration by up to 50%. Casement windows, hinged on the side and crank-open outward, deliver the tightest seal of any operable style, making them ideal for kitchen and bathroom openings throughout Nassau and Suffolk. Bay and bow windows project outward to add interior space and panoramic light — a popular upgrade for Long Island dining rooms and living rooms. Sliding windows work well on contemporary homes and coastal properties where outward-opening sashes would interfere with walkways.
We install all four major brands trusted by Long Island homeowners: Andersen (100, 200, 400, E-Series), Pella (250, Lifestyle, Architect), Marvin (Elevate, Signature, Essential), and Simonton — covering every budget from entry-level vinyl to premium wood-clad. Every installation meets ENERGY STAR requirements for climate zone 5, keeping heating costs down through Long Island winters. We are licensed and insured in both Nassau County and Suffolk County, handle all permit filings, and offer free in-home estimates. A typical project of 10 windows is completed in 1–2 days.
Key Benefits
Why Choose Window Installation on Long Island?
Every Window Type Installed
Double-hung, casement, awning, bay, bow, picture, sliding, hopper, and custom specialty shapes. We install vinyl, wood-clad (Andersen, Pella, Marvin), fiberglass, and aluminum-clad windows across all of Nassau and Suffolk County.
Energy Star & NYSERDA Rebates
All windows we install meet or exceed Energy Star requirements for the Northern climate zone. Triple-pane options with dual low-E coatings and argon gas fill qualify for up to $600 in federal energy tax credits. NYSERDA EmPower New York rebates are available for income-qualifying Long Island homeowners.
Long Island Salt Air Rated
Coastal Long Island homes — South Shore from Valley Stream to Montauk, North Shore from Great Neck to Port Jefferson — face constant salt air exposure that destroys aluminum frames and corrodes hardware. We install vinyl and fiberglass windows with marine-grade hardware rated for coastal environments.
Nassau & Suffolk Permits Handled
Most Long Island municipalities require permits for window replacement when the opening is modified or a new window type is installed. Nassau County towns (Town of Hempstead, Town of Oyster Bay) and Suffolk County towns (Town of Islip, Town of Smithtown, Town of Huntington, Town of Babylon) all have specific requirements. We pull every permit and coordinate inspections.
Transparent Pricing
Most Long Island homeowners pay $400–$1,200 per window installed for standard vinyl double-hung replacements. Premium wood-clad bay windows run $1,800–$3,800. A full-house project of 15 windows typically costs $6,000–$18,000. We provide free, itemized written estimates — no hidden fees, no bait-and-switch.
Same-Opening Replacements
The majority of Long Island window replacements are insert installations into existing frames — no siding or interior trim disturbance. We keep existing rough openings intact and install precision-measured new window units that fit perfectly, with foam insulation and flashing tape around every opening.
Our Process
How Your Installation Works
Free In-Home Estimate
We measure every window opening, assess the frame and sill condition, check for rot or structural issues in the rough opening, and discuss window style, glass package, and material options. You receive a written itemized estimate before we leave.
Window Selection & Order
We order your custom-measured windows from the manufacturer. Standard vinyl double-hung windows typically arrive in 2–3 weeks. Wood-clad and specialty units take 4–6 weeks. We confirm your installation date once the windows arrive at our warehouse.
Installation Day
Our crew protects your floors and furniture, removes the old windows, installs new units with foam insulation and flashing tape at every opening, installs interior and exterior trim, and hauls away all old window material. Most full-house projects finish in 1–2 days.
Inspection & Warranty
Where permits are required, we coordinate the final inspection with your local building department. You receive the manufacturer warranty registration, our 5-year workmanship warranty, and a signed permit close-out for your records.
Professional Installation
2,840+ windows installed across Long Island since 2011
Transparent Pricing
Window Installation on Long Island Cost on Long Island
Per Window Installed
$400 – $1,200
Whole-House (16 Windows)
$6,000 – $18,000
Window installation on Long Island typically runs $400–$1,200 per window for standard vinyl double-hung replacements in existing openings. Casement windows run $500–$1,400. Bay windows (3-panel) run $1,800–$3,800 installed. Bow windows (5-panel) run $2,500–$5,500. A full-house replacement of 15 standard windows typically costs $6,000–$18,000 depending on window type, frame material, and glass package (dual-pane vs triple-pane, standard vs low-E vs argon). All pricing includes removal and disposal of old windows, precision installation with foam insulation and flashing tape, interior and exterior trim, and our 5-year workmanship warranty.
Exact pricing depends on window size, glass options, and installation complexity. Get a precise quote for your home.
Get Your Free QuoteFrequently Asked Questions
Window Installation on Long Island FAQs
Customer Reviews
What Long Island Homeowners Say
They replaced all 16 windows in our 1957 ranch in one day. The team was professional, the new windows look incredible, and our heating bills dropped noticeably the first winter. Would absolutely use them again.
Patricia A.
Levittown, NY
We added a bay window to our living room and replaced 12 double-hungs throughout. The bay window installation was done perfectly — it sits flush with the siding and the interior trim looks custom. Very happy.
David R.
Smithtown, NY
Living near the bay means salt air destroys everything. The new vinyl windows they installed are rated for coastal environments and the hardware is much sturdier than what came out. No more corrosion issues.
Sandra K.
Merrick, NY
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