EcoView Windows of Long Island (August 2026) publishes $8,000 to $18,000 for 10 to 15 windows. One insert window is $600 to $1,100 installed, and a full-frame window is $900 to $1,500. The federal energy credit does not cover windows installed in 2026.
Last reviewed October 31, 2026.
The bedroom window fogs between the panes every morning in January, and the one in the kitchen will not stay up without a paint stirrer. Once you start counting, it is fourteen windows, and the first quote is for all of them.
Whole-house window totals
Most Long Island window jobs are quoted for the whole house, so start with what companies publish for a full set:
| Job | Published total | Source |
|---|---|---|
| 10 to 15 windows | $8,000 to $18,000 | EcoView Windows of Long Island (Aug 2026) |
| 10 to 15 windows | $8,000 to $21,000 | Long Island Windows and Siding (Oct 2025) |
| 10 to 15 windows | about $7,000 to $15,000 | Family Home Improvement (Dec 2025) |
| 15 windows, local manufacturer | $9,000 to $12,000 | Royal Windows and Doors (Mar 2026) |
| 15 windows, national brand | $12,000 to $18,000 | Royal Windows and Doors (Mar 2026) |
| 12-window ranch | $7,000 to $9,000 | Royal Windows and Doors (Mar 2026) |
| 20 windows, worked example | about $16,000 | All American Home Improvement (2026) |
Royal Windows and Doors says Nassau installs typically run $50 to $100 more per window than Suffolk. Its standard vinyl double-hung is $550 to $650 in Suffolk and $600 to $750 in Nassau.
Per-window price by frame material
| Material | Installed, per window | Source |
|---|---|---|
| Vinyl | $600 to $900 | Unified Home Remodeling (Apr 2026) |
| Vinyl | $300 to $1,100 | All American Home Improvement |
| Fiberglass or composite | $800 to $1,500+ | Unified Home Remodeling (Apr 2026) |
| Fiberglass | $600 to $1,600 | All American Home Improvement |
| Wood | $1,000 to $1,700+ | Unified Home Remodeling (Apr 2026) |
| Wood | $450 to $1,350 | All American Home Improvement |
All American Home Improvement puts the Long Island average at about $850 a window, with labor at $100 to $300 of that. Brand-name lines have their own pages: Andersen and Pella.
Per-window price by window style
| Window type | Installed, per window | Source |
|---|---|---|
| Double-hung, vinyl | $700 to $1,150 | Long Island Windows and Siding |
| Double-hung | $450 to $1,250 | All American Home Improvement |
| Casement | $525 to $1,500 | All American Home Improvement |
| Casement, fiberglass | $1,000 to $1,600 | Long Island Windows and Siding |
| Sliding, vinyl | $800 to $1,200 | Long Island Windows and Siding |
| Picture, wood-clad | $1,200 to $2,000+ | Long Island Windows and Siding |
| Bay or bow | $1,800 to $4,500 | EcoView Windows of Long Island |
| Bay or bow | $2,000 to $4,500 | All American Home Improvement |
A bay or bow is several windows framed as one unit that sticks out from the wall, which is why it costs as much as three or four standard windows.
What insert and full-frame each cost
EcoView Windows of Long Island is the one local company we found that prices the two methods separately: $600 to $1,100 for an insert window and $900 to $1,500 for full-frame, installed. Family Home Improvement says full-frame tear-outs that need rot repair or reframing carry 20 to 50 percent more labor. The window replacement page explains when each method makes sense.
Basement egress windows
An egress window is a different job: cutting the foundation, digging a window well and finishing the opening. Prices are per window, and companies include different things:
| Company | Published price | What is left out |
|---|---|---|
| Egress of Long Island | from about $5,500 with a masonry well; about $6,000 with a galvanized steel well; about $8,500 with a block well | Permits, engineered drawings and interior finish |
| LI Basement Pro | $3,500 to $8,000, depending on the foundation | Includes permit filing and drywall finish |
Egress of Long Island adds $1,000 for each extra 12 inches of depth. LI Basement Pro adds $1,000 to $2,000 for deep excavation.
Add-ons and the lead paint rule
| Item | Published price | Source |
|---|---|---|
| Removing old windows | $50 to $150 per window | All American Home Improvement |
| Frame repairs | $150 to $500 per window | All American Home Improvement |
| Trim, flashing and insulation upgrades | $50 to $200 per window | Family Home Improvement |
| Triple-pane glass | adds $100 to $300 per window | All American Home Improvement |
If your house was built before 1978, the EPA’s lead renovation rule applies to work that disturbs painted surfaces, and the EPA names window sills among them. The firm has to be certified in lead-safe work practices, sole proprietors included. Ask for the firm’s EPA certification before you sign.
Tax credits and PSEG rebates in 2026
The federal tax credit for energy-efficient windows is gone for new jobs. The IRS says the credit, capped at $600 for windows, covered qualifying property placed in service on or after January 1, 2023 and before December 31, 2025, and ENERGY STAR’s tax credit page says the same. Some contractor pages still advertise it.
PSEG Long Island’s 2026 Home Performance list does include a window rebate, paid per square foot of window, for windows rated 0.20 to 0.32 U-factor. The catch is in the same sheet: windows are permitted only with a whole-house cold climate air source heat pump and, at a minimum, insulation and air sealing. A window job on its own does not qualify.
Permits for replacement windows
The Town of Islip says no permit is required to replace a window or door that fits the existing opening without disturbing the headers or studs. A new opening, or a replacement that changes the headers or studs, needs a permit. Other towns and villages set their own rules, and an egress window cut into a foundation is a bigger permit question, so call your building department before the work is scheduled.
Islip's rule for a same-size window is on this page. The companies based in that town are on their own list.
