Business Details
50+ Years
experience
Expert Window & Door Installation in Philadelphia
Founded in 1959, Definis & Sons Windows & Doors has established itself as a trusted leader in custom window and door installation across the Delaware Valley. As a family-run business with over 50 years of experience, we combine meticulous craftsmanship with personalized consulting to deliver energy-efficient solutions tailored to each homeowner's needs. Our team of fully insured professionals specializes in vinyl replacement windows, steel entry doors, and security storm doors, backed by a 100% workmanship satisfaction guarantee.Recognized with the Angie's List Super Service Award annually since 2010 and an A+ rating from the Better Business Bureau, we pride ourselves on transparency, affordability, and exceptional service. With a vast showroom in Northeast Philadelphia and over 42,000 satisfied customers, we offer free in-home estimates and comprehensive warranties, ensuring every project meets the highest standards of quality and durability.
Services
Double Hung Windows
Bow & Bay Windows
Garden Windows
Slider Windows
Casement Windows
Basement Windows
Steel Doors
Fiberglass Doors
Sliding Patio Doors
Storm Doors
Details
- Year established: 1959
Highlights and features
- We have over 50 years of experience in custom window and door installation.
- Our company is rated A+ by the Better Business Bureau.
- We offer free in-home estimates and a comprehensive showroom.
- We provide energy-efficient window and door solutions.
- Our work is backed by a 100% workmanship satisfaction guarantee.
Associations and certifications
- Angie's List Super Service Award
- Better Business Bureau (BBB) A+
What people say
Exceeded our expectations
Beautiful job
Expert installers
Second to none
Saved on energy bills
Services
Double Hung Windows
Double Hung Windows offer superior energy efficiency and easy maintenance with tilt-in sashes for hassle-free cleaning. Available in 12 colors with foam-enhanced frames, these windows reduce energy costs while providing excellent ventilation. Custom grids and optional blinds between glass ensure personalized aesthetics for any home.
Bow & Bay Windows
Bow & Bay Windows add architectural elegance and increase natural light with three-dimensional designs. Constructed with fusion-welded vinyl and aluminum reinforcement, these windows feature durable frames and customizable vent combinations. Ideal for creating a focal point in living rooms or dining areas with enhanced curb appeal.
Garden Windows
Garden Windows create a greenhouse-like space for plants and herbs above kitchen sinks. Energy-efficient vinyl frames with multi-chambered construction improve insulation. The trapezoid vents and Exolite plant shelves combine functionality with style, transforming kitchens into brighter, more enjoyable spaces.
Slider Windows
Slider Windows provide smooth horizontal operation and maximum ventilation with fewer moving parts for durability. Available in three colors with custom grid options, these energy-efficient windows feature lift-out sashes for easy cleaning. Ideal for modern and contemporary homes seeking unobstructed views.
Casement Windows
Casement Windows offer a tight seal for superior energy efficiency with crank-operated hinges for easy operation. Reinforced frames ensure long-term durability while 90-degree opening maximizes airflow. Perfect for hard-to-reach areas requiring excellent ventilation and weather resistance.
Questions
How much do replacement windows cost?
Double Hung windows start at $199 per unit. Final pricing depends on customization, energy efficiency features, and installation requirements. Schedule a free estimate for exact costs.
Will new windows save on energy costs?
Yes. Energy-efficient options with dual-pane glass, argon gas, and Energy Star certification can reduce energy bills significantly while improving home comfort.
Do you offer free estimates?
Yes. We provide free in-home consultations and estimates with no obligation. Our experts help you choose the best windows and doors for your needs.
What areas do you serve?
We serve the entire Delaware Valley, Southern New Jersey, including Philadelphia, Bucks, Montgomery, Burlington, and Camden counties.
Are your installers insured professionals?
Yes. All our technicians are fully insured, uniformed professionals with decades of combined experience in window and door installation.
What warranties do you offer?
We provide comprehensive warranties covering both products and installation labor, ensuring long-term satisfaction and peace of mind for all our customers.
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