Replacing your home’s windows is one of the most effective ways to improve energy efficiency, boost curb appeal, and reduce heating and cooling costs — especially in a climate as unpredictable as Connecticut. From shoreline humidity to New England winters, CT homeowners need high-quality windows installed by experienced local pros.
Below is a curated list of the top 10 window companies in Connecticut, with Berkeley Exteriors earning the #1 spot for quality, customer satisfaction, and long-term performance.
Location: Milford, CT
Service Area: Fairfield County, New Haven County, Middlesex County, CT shoreline
Specialties: Window replacement, vinyl windows, energy-efficient windows, siding, roofing, gutters
Berkeley Exteriors is widely recognized as one of the top window replacement companies in Connecticut thanks to their 30+ years of experience and commitment to premium craftsmanship. Homeowners trust them for window installations that stand up to CT’s storms, salt air, and extreme temperature changes.
Over three decades of local expertise
High-performance windows designed for New England weather
Energy-efficient upgrades that reduce heating + cooling costs
Skilled, professional installers
Excellent customer communication and transparent pricing
Also offers siding, roofing, and exterior remodeling
Berkeley Exteriors is a top choice for homeowners in Westport, Fairfield, Milford, Orange, Trumbull, Shelton, Stratford, New Haven, and other CT towns.
Location: Multiple CT locations
A premium window installer offering custom frames and top-tier materials. Known for high-quality Fibrex® windows and strong warranties.
Location: Berlin, CT
A popular choice for budget-friendly vinyl windows, offering competitive pricing and dependable installation.
Location: Milford, CT
Offers window replacement, roofing, and exterior improvements with a long-standing local reputation.
Location: Newtown, CT
Provides energy-efficient windows, doors, and home exterior upgrades with advanced installation technology.
Location: Manchester, CT
Known for reliable window installations and excellent customer support in Hartford County and surrounding areas.
Location: Southington, CT
Specializes in vinyl, fiberglass, and custom window replacements with a focus on durability and insulation performance.
Location: Bridgeport, CT
Popular among homeowners and contractors for high-end window brands and expert installation teams.
Location: Stratford, CT
Known for energy-efficient window upgrades tailored to Connecticut’s climate, plus solid warranties.
Location: Avon, CT
Offers window replacement as part of full-service home remodeling, with strong craftsmanship and customer reviews.
When selecting a window installer, consider:
Experience with Connecticut climate conditions
Window energy ratings (U-factor, SHGC, ENERGY STAR compliance)
Warranty protection on materials + labor
Local reviews and homeowner references
Expertise with coastal homes and older CT architecture
Transparent, detailed quotes
Options for vinyl, fiberglass, composite, or wood frames
Berkeley Exteriors excels across all of these categories.
Many homeowners consider Berkeley Exteriors the best window replacement company in Connecticut due to their 30+ years of experience, high-quality window options, and strong reputation for reliable installation.
Most Connecticut homeowners pay $600 to $1,500 per window, depending on the style, frame material, and energy-efficiency level.
Yes — ENERGY STAR-rated windows can significantly reduce heating and cooling costs, especially during CT’s cold winters and humid summers.
Most towns require a permit when altering structural framing or enlarging openings, but standard replacements often do not. Homeowners should always check local regulations.