Window Installation on Long Island: 2026 Guide for Nassau & Suffolk Homeowners
Window installation on Long Island in 2026 typically costs $400–$1,200 per window installed, depending on window type, frame material, and glass package. A full-house project on a typical 15-window Nassau or Suffolk County colonial runs $6,000–$18,000. This guide covers what window installation on Long Island actually involves, how long it takes, permit requirements, and what separates a quality installer from a bad one.
What Window Installation on Long Island Costs in 2026
| Window Type | Per Window Installed | 15-Window Home |
|---|---|---|
| Vinyl double-hung (mid-grade) | $400–$700 | $6,000–$10,500 |
| Vinyl double-hung (premium) | $600–$950 | $9,000–$14,250 |
| Fiberglass (Pella Impervia / Marvin Essential) | $800–$1,400 | $12,000–$21,000 |
| Wood-clad (Andersen 400 / Marvin Signature) | $700–$1,200 | $10,500–$18,000 |
| Casement (per unit) | $550–$1,300 | — |
| Bay window (3-panel) | $1,800–$4,500 | — |
These are installed prices including removal of old windows, installation of new units, flashing, interior and exterior trim, and cleanup. Nassau County permit fees ($150 filing + $75/window for 4+) and Suffolk County permit fees ($50–$175 flat + inspection) are not included.
How Long Window Installation Takes on Long Island
A single window replacement takes 1–2 hours. A typical whole-house project of 12–16 windows takes 1–2 days with a full crew. What actually takes time is the permit process — Nassau County permit approval typically runs 5–15 business days; Suffolk County towns vary from 5 days (Babylon) to 3–4 weeks (Brookhaven). We order materials before the permit is approved so we can schedule your install immediately after approval comes through.
Permit Requirements for Window Installation on Long Island
Nassau County and Suffolk County permit requirements depend on the scope of work:
- Like-for-like replacement in the same rough opening: Often permit-exempt in Hempstead and Oyster Bay, but verify — individual village codes can override town rules.
- Bay or bow windows: Always require a permit — structural header modification is involved.
- Egress window installation (basement): Always requires a permit — foundation cutting and structural work is involved.
- Any opening modification (enlarging, reducing, adding new): Requires a permit regardless of window type.
We handle all permit filings as part of every window installation project. See our Nassau & Suffolk permit guide for town-by-town details.
What to Look for in a Long Island Window Installer
Window installation on Long Island has a lot of contractors — and a significant range in quality. The things that actually matter:
- Licensed in Nassau and Suffolk: Both counties require a Home Improvement Contractor (HIC) license. Ask for the license number and verify it.
- Pulls permits on every applicable job: An installer who skips permits is saving himself $150 and leaving you with an unpermitted installation that will surface as a problem at resale.
- Uses own W-2 installation crew: Subcontracted crews have no accountability once the check clears. Our crew is on payroll.
- Provides a written workmanship warranty: The window manufacturer warranties the product. The installer warranties the installation. Make sure you have both in writing before you sign.
- Carries liability insurance and workers' comp: If someone gets hurt on your property during the installation, you want the contractor's insurance — not yours — to cover it.
Why Long Island Window Installation Has Specific Challenges
Long Island's housing stock is mostly post-World War II construction — late 1940s through the 1970s — with a large percentage of cape cods, split-levels, and ranches. These homes were built before modern energy codes and often have non-standard rough opening sizes, lead-painted trim, and deteriorated flashing that needs replacement during installation. An experienced Long Island window installer knows to probe for lead before cutting, to replace all flashing in a single pass, and to re-insulate around every rough opening with closed-cell foam. Homeowners get in trouble when they hire contractors who treat every installation the same regardless of the home's age or condition.
Frequently Asked Questions
Which company does window installation on Long Island?
Window Company Long Island is a licensed window installation contractor serving Nassau and Suffolk County. We install Andersen, Pella, Harvey, Marvin, and Simonton windows with our own W-2 crew — no subcontractors. Every window installation project includes permits where required, 10-year workmanship warranty, and manufacturer warranty registration. Call (516) 730-4001 for a free in-home estimate.
What is the best window for window installation on Long Island?
For inland Nassau and Suffolk County homes, Andersen 400 Series and Harvey Tribute offer the best value. For coastal Long Island homes within a mile of the ocean or Sound, fiberglass frames (Pella Impervia, Marvin Essential) outperform vinyl and wood in salt-air conditions. The right window depends on your home's architecture, budget, and location.
How long does window installation take on Long Island?
A single window replacement takes 1–2 hours. A full house of 12–16 windows takes 1–2 days. Permit approval (required for bay, bow, egress, and structural changes) adds 5–15 business days in Nassau County. We order materials while the permit is pending to minimize your total wait time.
James Moretti
Founder & Lead Estimator
James started installing windows on Long Island in 2006 after five years as a general contractor. He founded Window Company Long Island in 2011 with one truck and a commitment to doing clean, on-time installations. Today the company runs four crews across Nassau and Suffolk counties.