Fiberglass Window Replacement Services for Philadelphia, PA, Area Homeowners
10% off Siding Project, with Special Financing - No payments till 2027!*
*10% off applies to siding material and installation only. Excludes windows, doors, decks, roofing, gutters, soffit, fascia, permits, taxes, and other services. Not valid with other offers or on past work. New projects only. Offer must be presented at time of sale. Financing is subject to credit approval; terms and conditions apply. Additional restrictions may apply.
Window Replacement That Solves Drafts, Rot, and Failing Frames for Good
Homeowners in the Philadelphia, Pennsylvania, area call on Five Star Contractors when they are tired of constant drafts, rising energy costs, and windows that no longer open or seal properly. We help these homeowners replace aging window systems with fiberglass windows built for long-term performance. Each project is approached with a focus on long-term performance, not just replacement, aligning every installation with proven building science principles.
Fiberglass provides a more stable foundation that addresses the problems created by older windows at the source rather than masking them. They are designed to stay stable through temperature swings, protect the opening, and improve comfort year-round.
Affordable Low Monthly Payments
Flexible Financing Options Available
What Makes Fiberglass the Right Window Frame Material for This Climate
Fiberglass behaves differently from traditional frame materials. Vinyl expands and contracts with temperature changes, which can affect long-term seal performance. Wood offers a classic look but requires ongoing maintenance and is vulnerable to moisture exposure. Fiberglass avoids both issues by maintaining dimensional stability through Philadelphia’s freeze-thaw cycles of winter and humid summers.
It also resists rot, corrosion, insect damage, and moisture intrusion without relying on surface treatments. In older homes where existing framing is already stressed, that stability helps reduce movement at the opening and supports more consistent long-term performance.
For homeowners weighing fiberglass and vinyl options, both materials can be a strong fit depending on the home’s age, frame conditions, and performance priorities. You can learn more on our vinyl windows page.
Fiberglass Window Styles Available for Your Home
Fiberglass frames work for nearly every major residential window style without limiting design or performance.
Double-hung windows remain the most common replacement choice in Philadelphia-area homes, offering a traditional look with easy cleaning.
Casement windows open outward with a side hinge and provide full ventilation, making them common in kitchens and bathrooms.
Single-hung windows provide a similar appearance with a fixed upper sash for simpler configurations.
Picture windows are fixed and designed to maximize natural light and exterior views.
Garden windows extend outward from the wall and are often used in kitchens above sinks as display areas.
Bay and bow windows extend outward, adding dimension and interior space.
Sliding windows are practical for wider openings where vertical operation is not ideal.
Custom and corner configurations are available for non-standard architectural layouts.
Our Fiberglass Window Installation Process
Older homes in Southeastern Pennsylvania often require more than a simple window swap. Our process is grounded in building science and is built to address both the existing opening and the new system that goes into it.
We source our fiberglass windows from highly regarded manufacturers such as Marvin, Andersen, Pella, and OKNA, selected for performance, design compatibility, and the household’s needs.
Initial Evaluation and Measurements
We inspect existing frames for rot, moisture damage, and structural movement, then confirm exact opening conditions before ordering or installing materials.
Product Selection and Configuration
Homeowners select the style, glass package, and frame finish based on performance goals and design preferences, with guidance on which options best suit the home’s structure.
Opening Preparation
Existing windows are removed carefully, and the surrounding opening is prepared to address any hidden damage or irregular framing conditions.
Fit and Installation: The new fiberglass unit is set, shimmed, and aligned to ensure proper operation and structural stability within the opening.
Fit and Installation
The new fiberglass unit is set, shimmed, and aligned to ensure proper operation and structural stability within the opening.
Flashing and Air Sealing
We apply flashing and sealing methods designed to manage water movement and reduce air leakage around the perimeter.
Interior and Exterior Finishing
Trim is restored or replaced to match the home’s existing style so the finished result integrates cleanly with the surrounding structure.
Energy Efficiency and Fiberglass Windows
Fiberglass supports strong energy performance by combining frame stability with modern glass technology.
Here’s what contributes to that efficiency:
Dimensional Stability: Fiberglass does not expand and contract significantly with temperature swings, helping perimeter seals stay intact through seasonal changes.
Strong Air Sealing Performance: A stable frame reduces gaps that can form over time, limiting drafts around the window opening.
Improved Thermal Resistance: Fiberglass is less conductive than metal frames, reducing heat transfer through the frame.
Compatibility with High-Performance Glass: Works well with double- and triple-pane glass packages that improve insulation and reduce heat gain and loss.
Reduced Long-Term Seal Stress: Because the frame stays consistent, insulating glass units are less likely to experience stress-related seal failure over time.
These benefits are a core reason fiberglass is commonly used in high-performance energy-efficient windows.
Financing Options for Fiberglass Window Replacement
Fiberglass window replacement is a long-term investment in comfort and efficiency. We offer financing options through GreenSky to help homeowners move forward with complete replacement projects rather than delaying upgrades over multiple seasons. Visit our specials and financing page for current options.
Our free estimate provides a clear scope of work and pricing before any commitment is made.
Areas We Serve in Southeastern Pennsylvania
We serve Chester County, Delaware County, Montgomery County, Bucks County, Philadelphia County, and Northern Delaware, including Wilmington, Hockessin, Newark, and Greenville.
Key service areas include West Chester, Malvern, the Main Line, and Wilmington, DE. For the full list, visit our service areas page.
Homeowners can also explore our project portfolio and customer reviews to see completed work and feedback from projects in the area.
Frequently Asked Questions About Fiberglass Window Replacement in Philadelphia
Timelines depend on the number of windows, the condition of the existing openings, and whether structural repairs are needed. After an on-site evaluation, we provide a project-specific schedule based on actual conditions.
Fiberglass typically has a higher upfront cost than vinyl, but it offers greater dimensional stability and longer-lasting performance, especially in older homes with shifting or non-standard openings. Over time, this can reduce maintenance and energy performance concerns tied to seal failure and frame movement.
Yes. Many homes built before the 1990s in Southeastern PA have non-standard openings. Fiberglass windows can be custom-manufactured to match these dimensions for a proper fit.
No. Fiberglass frames come with factory-applied finishes designed to resist fading, chipping, and chalking. Routine cleaning is typically all that is needed.
We provide a 5-year labor warranty on installation. Manufacturer warranties apply to the windows themselves. More details are available on our window installation and warranty page.
Talk to a Fiberglass Window Expert in Philadelphia
Five Star Contractors installs fiberglass windows across Philadelphia and Southeastern Pennsylvania with a focus on long-term performance and proper installation practices. Start with a free estimate to discuss your project and get clear direction on the right window solution for your home.
Reviews
We used Five Star Contractors initially for siding replacement and stucco remediation. Because of their excellent work we had them return a year later to replace our aging roof and install new gutters and downspouts. The management team and crews on both jobs were professional, polite and respectful of our property and our neighbors. As their name says... their work is 5 Stars!
Five Star remediated our failing stucco and repaired extensive hidden damage. They also replaced all doors and windows. Their crews were professional, friendly and respectful. We were impressed with their ability to replace all the windows and doors without creating a mess, and they replaced all trim and plantation shutters seamlessly. Robert was frequently on site, and he offered excellent design suggestions throughout the project. We recommend Five Star without reservations. You will not be disappointed.
We chose five star and are so glad we did! When we purchased a home that needed a full stucco remediation we interviewed and obtained quotes from many companies. Five Stars quality of work and professionalism really stood out among the rest. They were easy to work with, attentive to detail, responsive and fully delivered going above and beyond. They are not the cheapest company but you get what you pay for, and we got the best!
We had a great experience with Five Star Contractors when they fully replaced our siding. Discovering that our house needed major repairs was a stressful experience, but from our first meeting with Matt and Michal we felt at ease. From start to finish, they were incredibly communicative, always taking the time to answer our questions thoroughly. What really stood out was how they walked us through the science behind proper construction techniques, helping us understand not just what they were doing, but why it mattered. Throughout the process we had multiple roadblocks on our end, and they were very understanding and flexible. We highly recommend them to anyone looking for skilled, transparent, and knowledgeable professionals.
Best contractor in the area. Attention to detail and very trustworthy. They do the job right and stand behind all their work. The crew works hard and their goal is to make you happy, whatever your needs are. Five Star will at least meet, but probably exceed your expectations as they have for me. They are neat and clean up the site every night before they leave, even using a magnet to find loose nails because I have 4 dogs. I couldn’t be happier with them and I am not easy to please. Michal, thank you for all you do.
Five star did an excellent job with our stucco remediation. The quality of the work is exceptional. Michael and Robert are very involved with the day to day operation and came up with excellent ideas to make our vision become reality. Every person on the team was a pleasure to work with. They were on time, respectful and professional . In particular Jesse is absolutely exceptional in everything he does. We wholeheartedly recommend Five Star!
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