Why Our Installation Is Different
Certified Installers
Every installer is factory-certified and trained specifically for Connecticut's building codes and climate requirements.
Precision Fit
Custom measurements ensure every window fits perfectly — eliminating gaps, drafts, and energy waste in your CT home.
Efficient Process
Most homes completed in 1–2 days. We protect your home, install with care, and leave your space clean.
Lifetime Warranty
Our installation workmanship warranty covers labor for life — on top of manufacturer product warranties.
Our 5-Step Installation Process
From estimate to final inspection — here's exactly what to expect
Free In-Home Estimate
We visit your Connecticut home, inspect your current windows, take precise measurements, and discuss your goals. You get a detailed written estimate with no pressure and no obligation.
Window Selection
Choose from our curated selection of ENERGY STAR certified windows from brands like Andersen, Pella, Marvin, and Harvey. We help you pick the right style, material, and glass package for your home and budget.
Custom Manufacturing
Your windows are custom-built to your home's exact measurements. No generic sizing — every window is made specifically for your openings, ensuring a perfect fit.
Professional Installation
Our certified installers remove old windows, prep the openings, install new windows with proper shimming and leveling, apply insulation and weathersealing, and finish with interior and exterior trim.
Final Inspection & Cleanup
We test every window for smooth operation, verify proper seal and locking, clean all glass inside and out, remove all debris, and walk you through the warranty and care instructions.
Why Installation Quality Matters in Connecticut
Even the best window performs poorly if installed incorrectly. In Connecticut's climate — with temperature swings from -10°F to 95°F, heavy snow loads, driving rain, and coastal humidity — installation quality is arguably more important than the window itself.
Common installation mistakes include improper shimming (causing seal failure within 2–3 years), missing or insufficient insulation around the frame (creating thermal bridges), and poor flashing (leading to water infiltration and rot). Our certified installers follow manufacturer specifications precisely, ensuring your warranty stays valid and your windows perform as designed.
Every installation by 203 Windows includes a comprehensive checklist: level and plumb verification, foam insulation in all gaps, proper drainage planes, high-quality caulking at all exterior joints, and operational testing of every window before we leave.
Window Installation FAQ
How long does window installation take in Connecticut?
For a typical Connecticut home with 10–15 windows, installation takes 1–2 days. Each individual window takes approximately 30–60 minutes to remove, prep, install, insulate, and trim. We schedule installations to minimize disruption to your household.
What's included in your window installation?
Our full-service installation includes: removal and disposal of old windows, opening preparation and weatherproofing, window installation with proper shimming and leveling, closed-cell foam insulation around all gaps, interior and exterior trim and caulking, full cleanup, and a final walkthrough with operational testing.
Do you install windows in winter in Connecticut?
Yes, we install windows year-round in Connecticut. Each window is swapped individually (old out, new in) in about 30–60 minutes, so your home is never exposed to cold air for long. We use temporary weather barriers during installation and can work in temperatures as low as 20°F.
Do I need to be home during window installation?
We recommend having someone home during installation for the initial walkthrough and final inspection. However, if you need to step out during the work itself, that's perfectly fine. Our installers are background-checked, insured, and treat your home with respect.