Long Island Roof Guide

Window Replacement on Long Island

Per-window prices from Long Island installers, the difference between insert and full-frame replacement, and what to ask before you sign.

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Two roof dormers with windows and flower boxes
White gable with horizontal siding against a blue sky

Windows are priced per opening, so count yours before you call. Material, size and how much of the old window comes out set the price.

What a window costs here

WindowInstalled, per windowSource
Overall Long Island range$600 to $1,500Unified Home Remodeling, Apr 2026
Vinyl$600 to $900Unified Home Remodeling, Apr 2026
Fiberglass or composite$800 to $1,500+Unified Home Remodeling, Apr 2026
Wood$1,000 to $1,700+Unified Home Remodeling, Apr 2026
Full-frame labor$400 to $800+Unified Home Remodeling, Apr 2026
Overall Long Island range$300 to $1,200+County Roofing Systems, Jun 2026

Insert or full-frame

Insert replacement slides a new unit into the old frame. It is faster and cheaper, and your interior trim stays put. It only works if the old frame is solid and square.

Full-frame replacement removes everything down to the studs. It costs more, but it is the only way to fix rot around the opening and flash it properly. If you are replacing siding at the same time, full-frame is easier to do well.

What to compare between quotes

  • the brand and the exact product line
  • insert or full-frame, for each window
  • the glass package (double or triple pane, low-E coating)
  • how they handle the exterior trim: new aluminum capping, new trim boards, or reuse
  • disposal of the old windows
  • the manufacturer warranty and the installer’s labor warranty

Pair it with siding

If your siding is due in the next few years, it is worth pricing both. New windows set into new siding with fresh flashing is the cleanest job you can get.

Compare two or three quotes

Tell us the town and the job. Up to three Long Island contractors who do this work will reach out, and you decide who, if anyone, to hire.

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Long Island contractors to compare

Sorted by Google reviews (a Google Maps snapshot from October 2026). Each card says whether we have checked the county license yet.

All Nassau contractors   All Suffolk contractors

Questions people ask

Straight answers, with the source linked below.

How much does window replacement cost per window on Long Island?

Unified Home Remodeling publishes $600 to $1,500 per window installed on Long Island (April 2026). County Roofing Systems puts it at roughly $300 to $1,200 or more per window (June 2026). Material and whether it is a full-frame job move the price most.

What is the difference between insert and full-frame replacement?

An insert goes into the existing frame, so the trim inside and out stays. Full-frame takes the whole window out down to the rough opening, which costs more but lets the installer fix rot and re-flash the opening.

Do window installers need a county license?

Nassau County's home improvement application lists windows as covered work. Suffolk's license covers home improvement broadly. Ask for the license number and look it up either way.

Sources (3) checked October 2026
  1. Unified Home Remodeling, Window Replacement Cost Per Window, Long Island (updated Apr 14, 2026)
  2. County Roofing Systems, Window Replacement Cost on Long Island (Jun 2026)
  3. Nassau County Department of Consumer Affairs, Home Improvement application (lists windows)
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