Windows & Doors Installation Westchester NY
Licensed & Insured | 15+ Years Experience | Free Estimates
GCMM Home Improvement LLC — Professional Window & Door Installation in Westchester County
Licensed & Insured
Full liability and workers comp. NYS licensed contractor.
15+ Years Experience
Expert window and door installations across Westchester.
Local to Westchester
We know Westchester homes, climate, and building codes.
100% Satisfaction
Every window sealed tight, every door hung perfectly.
Professional Window & Door Installation in Westchester County
Your windows and doors do more than let in light and allow entry — they are critical to your home’s energy efficiency, security, curb appeal, and comfort. In Westchester County, where winters are harsh and summers are humid, properly installed windows and doors make the difference between a drafty, uncomfortable home and one that stays warm, quiet, and efficient year-round.
GCMM Home Improvement installs replacement windows, new construction windows, entry doors, patio doors, sliding doors, French doors, storm doors, and garage doors for homeowners throughout Westchester. We work with all major brands — Andersen, Pella, Marvin, Harvey, and more — and we handle every step from measurement and ordering to installation, insulation, flashing, trim, and cleanup.
Whether you need to replace a single drafty window in your Scarsdale Colonial or install new French doors opening onto your Larchmont patio, GCMM delivers precise, weathertight installations that look beautiful and perform for decades. We also coordinate with our painting and remodeling teams for seamless interior and exterior finishing.
What’s Included in Our Window & Door Service
- ✓ Replacement window installation (double-hung, casement, picture, bay, bow)
- ✓ New construction window installation for additions and new builds
- ✓ Entry door installation (fiberglass, wood, steel, custom)
- ✓ Sliding door and patio door installation
- ✓ French door installation (interior and exterior)
- ✓ Storm door and screen door installation
- ✓ Proper flashing, insulation, and weatherproofing around every opening
- ✓ Interior and exterior trim, casing, and caulking
- ✓ Hardware installation and lockset setup
- ✓ Old window and door removal, disposal, and full cleanup
Cost Note: Replacement window costs in Westchester typically range from $400–$1,200 per window installed, depending on size, style, and brand. Entry doors range from $1,500–$5,000 installed. Sliding or French patio doors run $2,500–$7,000. A full-home window replacement (10–20 windows) typically falls between $8,000–$20,000. Every project receives a detailed estimate.
Our 5-Step Process
In-Home Consultation
We inspect your existing windows and doors, take precise measurements, and discuss options.
Product Selection & Estimate
We help you choose the right products and provide a written, itemized estimate.
Order & Schedule
Products ordered to your exact specs. Installation date scheduled at your convenience.
Professional Installation
Expert removal of old units. New windows and doors installed, insulated, flashed, and trimmed.
Final Inspection
Every unit tested for operation, seal, and appearance. Full walkthrough before sign-off.
Why Choose GCMM for Windows & Doors
Window and door installation is not a place to cut corners. Improper installation leads to air leaks, water infiltration, condensation, and premature hardware failure — problems that cost far more to fix than doing it right the first time. GCMM’s installers are experienced carpenters who understand rough openings, shimming, leveling, flashing details, and the specific requirements of Westchester County’s climate.
We are not a window company that pushes one brand. We are a full-service home improvement contractor that installs the windows and doors best suited to your home and budget. Need energy-efficient triple-pane windows for a drafty Tarrytown Tudor? A custom mahogany entry door for a Bronxville estate? New sliding doors for a Harrison ranch? GCMM handles it all — along with the trim, caulking, and finishing that complete the job.
Frequently Asked Questions
How much do replacement windows cost in Westchester County?
Replacement windows typically cost $400–$1,200 per window installed, depending on size, style (double-hung, casement, picture), frame material (vinyl, wood, fiberglass), and glass package (double-pane, triple-pane, Low-E). A 15-window whole-home replacement averages $10,000–$18,000.
How long does window or door installation take?
A single window replacement takes 1–2 hours. A full-home window replacement (10–20 windows) is typically completed in 1–3 days. Entry door installation takes 4–8 hours. Sliding or French door installations may take a full day, especially if the rough opening needs to be modified.
Do I need a permit to replace windows or doors?
In most Westchester municipalities, like-for-like window replacements (same size opening) do not require a permit. However, changing the size of a window or door opening, adding a new opening, or installing an egress window typically requires a building permit. GCMM handles all necessary permits and inspections.
What type of windows are best for Westchester County homes?
For Westchester’s climate, we recommend Energy Star-rated double-pane or triple-pane windows with Low-E glass and argon gas fill. Vinyl and fiberglass frames offer the best energy performance and lowest maintenance. Wood frames are ideal for historic homes where appearance is paramount. We help you balance performance, aesthetics, and budget.
Can you install windows and doors in winter?
Yes. We install windows and doors year-round. Each opening is exposed for only a short time during replacement, and we use temporary weatherproofing to keep your home sealed. Caulk and foam insulation products used are rated for cold-weather application. Winter is actually a great time to book, as lead times are shorter and scheduling is more flexible.
Towns We Serve in Westchester County
GCMM Home Improvement installs windows and doors throughout Westchester County, including:
Scarsdale • White Plains • New Rochelle • Bronxville • Larchmont • Mamaroneck • Rye • Harrison • Tarrytown • Yonkers • Mt. Vernon • Dobbs Ferry • Pelham • Eastchester • Ardsley
Related: Bathroom renovation | Kitchen renovation | Painting contractor | Handyman services | Home remodeling
Ready for New Windows or Doors?
Get a free estimate from GCMM Home Improvement. Licensed, insured, and trusted across Westchester County.
Use promo code SPRING26 for your free estimate
Free estimates — no obligation. Serving all of Westchester County.