I made a big mistake once on a window job.
It was for a quiet villa tucked in the mountains. The view was amazing, and the owner needed strong, weather-resistant windows. I picked a supplier I thought looked good. Their brochure was nice. The salesperson sounded helpful.
But the windows showed up late. Some were scratched. A few didn’t even fit.
That job taught me something important just because a company looks good doesn’t mean they’ll do a good job.
Since then, I’ve worked with many window suppliers. I’ve seen who delivers on time, who answers calls, and who doesn’t.
In this article, I’ll share 7 composite window manufacturers that I’ve looked into or worked with directly.
If you’re planning to build or upgrade and want windows you can count on, this list will help you compare the best options without wasting time or money.
So let’s begin!
Quick Comparison Chart
Before we dig deeper into each manufacturer, here’s a quick snapshot to help you get your bearings. This table gives you a side-by-side look at what each company offers.
| Manufacturer | HQ Location | Key Composite Tech | Best For | Key Strengths | Drawbacks |
| Andersen Windows & Doors | Bayport, Minnesota, USA | Fibrex® Composite | Custom homes, villa builds | Proven durability, strong dealer network | May be expensive in some regions; lead times vary |
| Pella Corporation | Pella, Iowa, USA | Fiberglass Composite (Impervia®) | Hotels, high-heat or cold climates | Energy performance, sleek modern frames | Limited series available in some locations |
| Vallisco | Shanghai, China | Composite + Aluminum Options | Villas, hotels, greenhouses | Customizable, accepts drawings, flexible MOQs | Not ideal for single-window orders |
| Marvin Windows & Doors | Warroad, Minnesota, USA | Ultrex® Fiberglass | Mountain homes, energy-efficient builds | High-end finish, strong thermal stability | Premium pricing; longer lead times on custom |
| Milgard Windows & Doors | Tacoma, Washington, USA | C650 Ultra™ Fiberglass | Western U.S. projects, villas | Fast delivery, solid regional service | Limited distribution beyond western U.S. |
| Deceuninck | Hooglede-Gits, Belgium | Linktrusion™ Composite | Energy-conscious builds, passive homes | Excellent U-values, global support | System names can be technical/confusing |
| Internorm | Traun, Austria | Timber-Aluminium, uPVC-Alu | Premium villas, boutique hotels | Passive house certified, high acoustic ratings | Limited access outside Europe; long lead times |
Now that you’ve seen the big picture, let’s break each manufacturer down one by one.
1. Andersen Windows & Doors
- Founded: 1903
- Headquarters: 100 Fourth Avenue North, Bayport, MN 55003, USA
- Company Type: Privately Owned
- Employees: Over 12,000
- Main Markets: North America and select global partners
Andersen is a household name for residential window manufacturing. Their windows are often found in villas, custom homes, and high-end remodels thanks to their reliability and well-supported dealer network.
They’re especially recognized for developing Fibrex®, a wood–polymer composite that’s stronger than vinyl and needs little upkeep. I’ve seen it perform well in both dry mountain builds and humid coastal installs.
Product Range & Window Options
- Fibrex® Composite Windows: Made from a blend of reclaimed wood fiber and polymer, these frames are twice as strong as vinyl and resist rotting, flaking, and fading. Available in casement, double-hung, awning, and more.
- Wood Windows: Built for natural warmth and beauty with exterior aluminum cladding for weather protection. Commonly used in custom luxury homes.
- Vinyl Windows (100 Series): Designed for modern homes needing a budget-friendly, durable solution. Offers good thermal insulation with a clean, low-profile look.
- Entry and Patio Doors: Includes sliding, hinged, and folding door systems in wood, composite, and fiberglass materials. Pairs well with their window collections for consistent design.
Build Quality & Manufacturing
Andersen manufactures Fibrex® frames in-house using recycled wood and polymer materials. These frames expand and contract less than vinyl, which helps the window maintain its shape and seal for longer.
Over time, I’ve found Andersen windows to resist common issues like seal failure, sticking, or cracking. This makes them a dependable pick for projects in places with strong sun or frequent rain.
Support & Project Services
- Certified Contractor Network: Andersen partners with trained installers who understand their systems. This minimizes installation errors and improves long-term fit.
- Builder Design Tools: They offer 3D planning tools, spec sheets, and visualizers online. These tools are helpful for layout planning and client presentations.
- Warranty & After-Sales Support: Fibrex® windows come with a limited warranty. Issues can be reported online or through a local dealer network.
Final Take
If you’re planning a project that needs strong, low-maintenance windows with proven field performance, Andersen is a name you can rely on. Their Fibrex® composite frames work well in both cold and hot climates, and their wide selection makes matching your building style easy.
However, Andersen doesn’t sell directly to most buyers, so you’ll need to go through one of their certified dealers. That process can take a bit longer, especially in rural areas or during peak seasons.
2. Pella Corporation
- Founded: 1925
- Headquarters: 102 Main St. Pella, IA 50219
- Company Type: Family-Owned (Privately Held)
- Employees: Over 10,000
- Main Markets: United States and select export markets
Pella has a long-standing reputation in the window and door industry, especially for innovation in energy efficiency and material strength. They’ve kept their focus on real-world performance, and that shows in their product testing.
What stood out to me was how responsive their team was during one hotel renovation project. They gave clear timelines and matched the right product to the location’s extreme sun exposure.
Product Range & Window Options
- Fiberglass Composite Windows (Pella Impervia®): Engineered from a proprietary fiberglass composite that’s stronger than wood or vinyl. Performs well in extreme heat or cold, making it ideal for hotels or homes in variable climates.
- Wood Windows: Available in their Architect and Lifestyle Series. Combines natural wood interiors with aluminum-clad exteriors for better weather resistance.
- Vinyl Windows (250 & 350 Series): Offers budget-friendly options with multi-chambered frames for improved insulation. Great for rental properties or second homes.
- Doors: Includes patio doors, entry doors, and multi-slide systems across all material types. Many door styles match their window product lines.
Build Quality & Manufacturing
Pella manufactures its composite frames with Duracast®, a reinforced fiberglass material that doesn’t expand or contract much under temperature swings. These windows meet or exceed ENERGY STAR® standards in most regions.
In my experience, they’re well-sealed and don’t show visible warping even years later. The finish also holds up nicely with minimal fading in full sun.
Support & Project Services
- Project Estimation and Planning Tools: Pella’s website includes configurators and product match tools. These help narrow down choices based on building type or climate.
- Installation Services: They offer factory-trained installers through Pella Certified Contractors. This can be helpful if you’re managing multiple trades.
- After-Sales Support and Warranty: Their composite windows carry a limited lifetime warranty. Claims and parts requests can be filed through their online portal.
Final Take
If your project needs a composite window that’s strong, low-maintenance, and performs in both heat and cold, Pella’s Impervia® line is worth a close look. They’ve done their homework on materials that last, and the variety in their lineup makes it easier to match your architectural needs.
However, Pella’s pricing can run higher than basic vinyl brands, and not every series is available in all regions. It’s best to connect with a local Pella showroom early to confirm availability and timelines.
3. Vallisco
- Founded: Registered in 2024, with over 24 years of industry experience under its parent company
- Parent Company: Qeeka Home (Established 2007)
- Headquarters: Building 1, No. 1926, Cao An Highway, Jiading District, Shanghai, China 201824
- Company Type: Manufacturer & Export Supplier
- Main Markets: Southeast Asia and Europe
- Product Focus: Custom and Standard Windows & Doors
Vallisco specializes in full-scale door and window solutions for villa owners, hotels, B&Bs, and small commercial projects. They don’t handle one-off residential orders but gladly take on multi-window replacements or full-home projects.
What made them stand out for me is how flexible they were in handling mixed materials in a greenhouse order aluminum for the frames, composite for energy-saving panels, and integrated screen windows all in one package.
Product Range & Window Options
- Composite Windows: Built for strength and energy efficiency, these frames combine multiple materials to resist corrosion and retain their shape over time. Ideal for climates with moisture or salt exposure.
- Aluminum Windows: Known for their slim profiles and strength, they are lightweight yet durable. Often chosen for modern villas or greenhouses needing maximum glass area.
- Vinyl Windows: Offers a low-maintenance, affordable solution with basic insulation. Useful in secondary buildings or budget-conscious B&Bs.
- System and Curtain Wall Windows: These large-format glazing systems are suitable for projects needing expansive views. They’re often used in lobby areas or upscale hotel builds.
Build Quality & Manufacturing
Vallisco manages its own manufacturing facility, allowing for flexible production volumes and design adjustments. They offer both standardized models and fully custom builds based on client drawings.
From what I’ve seen, their finish quality is clean, and their packaging for export is done with care reducing the chance of scratches or damage during transit.
Support & Project Services
- Custom Design Flexibility: Vallisco accepts architectural drawings and adapts them into working production formats. This is helpful if you’re managing non-standard building dimensions.
- Bulk Order Coordination: Ideal for hotel, villa, or multi-unit projects. They’re used to handling mixed product orders in one shipment.
- Pre-Sale Guidance: Their team helps clarify material options, glass types, and opening styles. This saves time during planning.
Final Take
If you’re working on a villa, boutique hotel, or greenhouse and need a supplier that can handle both custom design and bulk coordination, Vallisco is worth considering. Their flexibility in production and product variety can make complex orders feel simple on your end.
However, they may not be the best fit for small, one-off home renovation jobs. Their model favors B2B-scale orders or projects involving multiple units, so make sure your scope aligns before reaching out.
4. Marvin Windows and Doors
- Founded: 1912
- Headquarters: Warroad, Minnesota, USA
- Company Type: Family-Owned (Privately Held)
- Employees: Over 7,000
- Main Markets: United States, with growing global partnerships
Marvin is known for combining modern engineering with a craftsman’s mindset. They’re especially respected for their Infinity and Elevate product lines, which offer fiberglass composite frames built to handle temperature shifts without warping.
I once worked on a lake house where Marvin’s windows were selected specifically for their sleek profiles and durability. Even the client noticed how smooth the operation felt compared to their old sliders.
Product Range & Window Options
- Ultrex® Fiberglass Windows (Infinity & Elevate Lines): Made with pultruded fiberglass that’s eight times stronger than vinyl. These resist expanding and contracting in extreme weather, helping prevent seal failure.
- Wood-Clad Windows (Signature Collection): Offers natural wood interiors with extruded aluminum cladding on the outside. Great for custom builds where aesthetics matter.
- All-Wood Windows: Fully wood-framed units for traditional builds or restorations. Allows for deep customization with stains and profiles.
- Doors: Sliding, swinging, and bi-fold patio doors available across all material types. Most match directly with window designs for cohesive looks.
Build Quality & Manufacturing
Marvin manufactures all its Ultrex® frames in-house using a high-pressure process that makes them incredibly rigid and stable. These frames resist swelling, rotting, and cracking perfect for climates with seasonal temperature swings.
Their quality control is strong. I’ve ordered custom-sized units before, and what arrived matched the spec sheet exactly no adjustments needed during install.
Support & Project Services
- Architectural Support: Marvin provides CAD files and spec resources for engineers and architects. Useful for new builds or matching historical plans.
- Certified Installers: They work with trusted contractors familiar with Marvin products. This minimizes installation issues and callbacks.
- Design Tools and Galleries: Helpful online configurators let you preview finish combinations and hardware. Great for showing clients or confirming your own design ideas.
Final Take
If you want windows that perform well in all climates and still look clean and modern, Marvin is an excellent fit. Their Ultrex® material is especially good for minimizing long-term movement and wear ideal for villas or guesthouses where comfort matters.
However, Marvin’s composite options may be priced higher than vinyl or entry-level alternatives. But if you value lasting performance and quiet confidence, they’re worth the investment.
5. Milgard Windows & Doors
- Founded: 1958
- Headquarters: Tacoma, Washington, USA
- Company Type: Subsidiary of MITER Brands
- Employees: Over 3,000
- Main Markets: Western U.S. and Canada
Milgard is known for building windows that suit both modern and traditional home designs, with a strong focus on energy efficiency and durability. Their fiberglass composite line offers strength without giving up a clean look.
I’ve used their Ultra™ Series in a project for a high-elevation vacation home. The customer wanted low maintenance, and the windows handled both strong sun and cold weather without issue.
Product Range & Window Options
- Fiberglass Composite Windows (C650 Ultra™ Series): Designed with pultruded fiberglass for strength and shape retention. These windows mimic painted wood but resist swelling, cracking, and rotting.
- Vinyl Windows (Tuscany® & Trinsic™ Series): Made for low maintenance and thermal efficiency. Good fit for rentals or coastal homes with salt exposure.
- Aluminum Windows (AX550 Series): Thin-framed, modern-looking units built for large openings. Often used in contemporary villas or sunrooms.
- Patio and Moving Glass Doors: Multi-slide, French-style, and bi-fold designs available. Pair well with their window lines for a cohesive finish.
Build Quality & Manufacturing
Milgard manufactures its windows in regional factories, which shortens lead times and simplifies service. Their fiberglass frames are powder-coated and cured for long-term color stability.
From my own installs, Milgard’s hardware feels solid, and their fit and finish are consistent especially on larger custom sizes where some brands struggle.
Support & Project Services
- Local Manufacturing & Delivery: With regional facilities across the West, delivery and service are typically faster than national brands. This helps keep projects on schedule.
- Full Lifetime Warranty: Covers parts and labor for as long as you own the home. This gives peace of mind for both homeowners and builders.
- Technical Support and Resources: Their website includes installation guides, sizing charts, and energy data. Handy for contractors or clients who need clear specs.
Final Take
If you’re building or renovating in the western U.S. or Canada and want composite windows that hold up to changing weather, Milgard’s fiberglass line is a reliable choice. Their Ultra™ Series feels like wood, but needs almost no upkeep perfect for second homes or villas in remote areas.
However, availability may be limited outside their regional network. So if you’re building further east or internationally, you’ll want to confirm logistics before committing to a full order.
6. Deceuninck
- Founded: 1937
- Headquarters: Hooglede-Gits, Belgium
- Company Type: Publicly Traded (Euronext Brussels: DECB)
- Employees: 3,800+ across 90 countries
- Main Markets: Europe, North America, Asia-Pacific
Deceuninck focuses on performance-first window systems, especially where insulation, structural strength, and recyclability matter. They’re a regular name in European passive housing circles.
The first time I dealt with them was through a developer in Belgium. Their team knew exactly how to hit the energy targets without complicating the install.
Product Range & Window Options
- Linktrusion™ Composite Windows: Uses glass fiber-reinforced PVC plus steel to improve strength without adding weight. Built for high-insulation projects like villas and low-energy homes.
- Twinson® Composite Systems: A mix of wood and PVC used in decking and façades. Often paired with window systems for full façade continuity.
- uPVC Window Frames: Simple, recyclable PVC frames made to reduce heat loss. They’re the go-to option across Deceuninck’s residential builds.
- Sliding and Lift-Slide Doors: Built to match their window profiles. Available in wide openings for modern villa or patio-facing spaces.
Build Quality & Manufacturing
What makes Deceuninck different is their control over every part of the process from profile design to raw material compounding. The composite frames hold their shape well and meet tough standards for air and water tightness.
I’ve found their profiles useful in greenhouse-style spaces, where glass dominates but thermal bridging can’t be ignored.
Support & Project Services
- Local Adaptation, Global Tech: Each region adapts Deceuninck’s profiles for climate and code. Good if you’re working across countries.
- Design Tools & Testing Data: You’ll get full documentation U-values, acoustic tests, color samples, and more.
- Sustainability Ready: Many products help meet LEED or Passive House goals. They also use recycled content in production.
Final Take
If your project is chasing energy efficiency without sacrificing size, style, or reliability, Deceuninck offers some serious tools. Their Linktrusion™ tech is solid, and their profiles are made with future regulations in mind.
However, their product names and systems can get technical fast. If you’re not used to EU-style spec sheets, have someone walk you through what’s available in your region.
7. Internorm
- Founded: 1931
- Headquarters: Traun, Austria
- Company Type: Privately Owned
- Employees: Over 2,000 across Europe
- Main Markets: Europe, with distribution in over 20 countries
Internorm is Europe’s largest window brand, known for its premium, high-performance composite systems. If thermal insulation and clean design are at the top of your list, this is a brand worth exploring.
On a past job for a mountain inn, the architect insisted on Internorm. After install, the client called it “the quietest room in the building.” That stuck with me.
Product Range & Window Options
- Timber-Aluminium Windows: Combines warm wood interiors with weather-resistant aluminum cladding. Ideal for villas or boutique hotels needing both charm and durability.
- uPVC-Aluminium Composite Windows: Offers thermal insulation and minimal maintenance. Built for low-energy homes or modern builds with large glazing areas.
- Lift-Slide and Studio Doors: Designed to match window lines, these offer wide openings with top-notch sealing. Great for garden views or patio access.
- Noise-Reducing Glazing Options: Optional upgrades for extra sound insulation, especially valuable in city hotels or busy neighborhoods.
Build Quality & Manufacturing
Internorm’s frames are manufactured in Austria using precision automation and multi-layer quality checks. Their composite models are designed to meet Passive House standards meaning airtight sealing, triple glazing, and low U-values.
When I handled their frames on-site, everything from the click of the hardware to the glass clarity felt engineered, not mass-produced.
Support & Project Services
- Architect and Builder Tools: Internorm provides CAD files, 3D planners, and system details. Great for design teams or engineers.
- On-Site Delivery Coordination: Delivered with full packaging and labeling for easier unloading. Helpful when managing multiple room types.
- Energy Consultation Services: Internorm’s local reps often help clients hit energy performance targets through frame and glazing choices.
Final Take
If your build needs windows that quietly perform in harsh weather and still look sleek, Internorm is worth every bit of consideration. Their composite systems are made with long-term energy savings and acoustic comfort in mind.
However, availability can be limited outside of Europe, and lead times may stretch depending on customization. Be sure to plan ahead if you’re considering them for a remote or overseas project.
Conclusion
That villa job still sticks with me. I chose wrong because I didn’t dig deep enough. You don’t have to make the same mistake.
This guide gave you 7 reliable composite window manufacturers. You now know who’s dependable, where they ship, what materials they offer, and how they support your build.
Start comparing one of these brands could be the partner your project needs.
Still unsure? Reach out Vallisco today we’re happy to help you!
