The first time I ordered window frames overseas, the lead time doubled without warning. My client wasn’t happy, and I was stuck making excuses I didn’t believe myself.
That was the moment I understood that reliable manufacturers are as valuable as the product itself.
Over the years, I’ve worked with suppliers big and small, and I’ve tracked their consistency, communication, and quality.
These reviews are built on that real-world experience.
Inside, you’ll find my top 7 manufacturer picks, with practical details to help you choose based on quality, capacity, and turnaround time. You’ll get the clarity you need before signing a single purchase order.
After all, the best time to avoid a supply headache is before you place the order.
So, let’s get right into it!
Quick Comparison
When you’re evaluating window frame suppliers, it helps to see how they stack up in one place. The table below compares key aspects of seven major manufacturers so you can quickly match their strengths to your project needs.
| Manufacturer | HQ | Key Strengths | Main Focus | Target Markets | Ideal For | Differentiator |
| LIXIL | Japan | Global scale, strong brands | uPVC, aluminum, wood windows/doors | Asia, Europe, NA | Large-scale, diverse projects | Multiple brands under one group |
| FAKRO | Poland | Roof window innovation | Roof windows, skylights | Europe, global | Sloped roof & loft projects | 2nd-largest roof window maker |
| Vallisco | China | Broad range, custom builds | Doors & windows | SE Asia, Europe | Villas, hotels, B&Bs | Backed by 24 yrs industry experience |
| Kömmerling | Germany | uPVC profile expertise | Window/door profiles | Europe, global | Manufacturers seeking quality extrusion | Premium profile systems |
| Fenesta | India | Market leader, end-to-end service | uPVC & aluminum windows/doors | India, intl | Customized builds, all scales | 900+ city network |
| Dowell | Australia | Local-made, energy-efficient | Aluminum, timber windows/doors | Australia | Sustainable local builds | 160+ years in market |
| All Weather Windows | Canada | Climate-specific, energy focus | uPVC, aluminum-clad, fiberglass | Canada | Extreme climate builds | Largest private Canadian maker |
1. LIXIL Corporation
If you work in the building industry, you have probably seen the LIXIL name more than once, and for good reason. This company was formed in 2011 when five leading Japanese building materials and housing companies joined forces, pooling decades of experience and craftsmanship.
Today, LIXIL operates in more than 150 countries with a team of around 53,000 people. That means wherever your project is, there is a good chance they already have boots on the ground and the resources to back you up.
They have also made smart acquisitions over the years, bringing trusted brands like GROHE and American Standard into their family. This combination of Japanese precision and global brand power is designed to make your projects smoother, more reliable, and more innovative.
Their purpose is simple: “making better homes a reality for everyone, everywhere.” Whether you are sourcing for new construction or looking for renovation solutions, LIXIL aims to give you products that tick the boxes for quality, performance, and style.
- Website: https://www.lixil.com
- Address: 2-1-1 Ojima, Koto-ku, Tokyo 136-8535, Japan
Key Products
- Windows: High-performance hybrid and resin windows designed for superior insulation and energy efficiency
- Entrance Doors: Stylish yet secure designs with strong thermal insulation properties
- Exteriors: Gates, garages, terraces, and garden rooms to enhance curb appeal and function
- Wooden Interior Furnishings: A wide range of designs and colors for comfort and style
- Special Solutions: Fire-resistant siding, aluminum frames for solar systems, and the Super Wall construction method for insulation and seismic resistance
- Smart Home Products: IoT and AI-assisted next-generation home solutions
- Remodeling Products: Replus replacement windows and full-home insulation solutions
Services Provided
LIXIL puts a strong emphasis on helping you get the most from their products. They provide clear instruction manuals, how-to videos, and even up to 10-year warranties, so you can feel confident about long-term performance.
Their global network includes 79 factories across 10 markets, which means they can deliver consistently and keep your project moving. They also offer technical support for dealers, developers, wholesalers, contractors, and architects, making it easier for your entire team to work with their products.
Certifications and Quality Assurance
- Quality Management System: Complies with ISO 9000 series and Japanese Industrial Standards (JIS)
- LIXIL Quality Principles: Published in 14 languages for global consistency
- Risk Assessment Methods: Uses FTA, FMEA, and DRBFM in design and development
- Supplier Quality Audits: Regular checks and improvement programs with suppliers
- Product Safety: Proactive measures to prevent defects and accidents
Business Partnerships
LIXIL operates a global house of brands including INAX, GROHE, American Standard, and TOSTEM. This allows them to serve multiple markets and customer needs while benefiting from centralized R&D and supply chain efficiencies.
Their supply chain spans 79 factories worldwide, and they also partner with service providers such as Google for specific projects. Internally, they invest in Employee Resource Groups to promote diversity, inclusion, and collaboration, which can lead to more innovative solutions for you.
Bottom Line
LIXIL blends Japanese craftsmanship with global innovation to deliver a full spectrum of housing and building solutions. Their global reach, strong brand portfolio, and focus on quality make them a solid choice for projects of all sizes. However, given their large-scale operations, you might find their processes less flexible than smaller, niche manufacturers.
2. FAKRO
If you work in roofing or loft conversions, you have likely heard of FAKRO. Founded in 1991 in Poland as a family-owned business, it has quickly grown into one of the world’s top roof window manufacturers.
FAKRO now holds the number two spot in the global roof window market with about 15% market share. That is impressive growth, especially for a company that is younger than many of its competitors.
With products sold in over 50 countries and operations in places like the UK, Austria, Spain, the Netherlands, Ireland, Germany, Russia, and Hungary, they have built a strong international presence.
Their focus is simple: provide innovative, high-quality solutions for lofts and roof spaces, from roof windows and skylights to loft ladders and accessories. This specialization has helped them carve out a reputation for reliability and innovation in a competitive industry.
- Website: https://www.fakro.com
- Address: 37-450 Nowy Sącz, Poland
Key Products
- Roof Windows: Wooden and aluminum-clad plastic models, moisture-resistant designs, PVC pivot types, solar and Z-WAVE controlled options, arc and panoramic windows, L-shaped combinations, and fixed non-opening windows
- Flat Roof Windows: Complete systems designed for flat roof installations
- INNOVIEW Vertical Windows: Vertical window systems with optional awning blinds
- Loft Ladders: High-quality wooden ladders with 160 kg load capacity, hatch locks, non-slip feet, and included opening rods
- Accessories: Flashings for different roof coverings, special flashings for thermal insulation, balcony windows, dormers, and more
- Electric Control Systems: Z-Wave, smart home, Wi-Fi options, remote and wall controls, sensors, and modules
- Smoke Ventilation: Specialized windows and control units for smoke ventilation
- Skylights: Fixed, manual, and electric models
- Internal Accessories: Venetian blinds, roller blinds, pleated blinds, insect screens
- External Accessories: Awning blinds, roller shutters
- Installation Accessories: Insulating sets, airtight flashing, collars, frame extension kits, vertical slats, and more
Services Provided
FAKRO is set up to make your job easier from planning through to installation. They offer brochures, catalogues, and direct contact through their website, so you can quickly get answers and advice.
For professionals, they provide dedicated resources like CAD drawings, CE Declarations of Performance, virtual showrooms, installation videos, and fitting instructions. Their skylight templates and simple fastening systems even allow for “one-man installation,” saving you both time and labor costs.
Certifications and Quality Assurance
- Quality System: Meets European and American standards, supported by an integrated quality management system
- CE Declarations: Compliance with EU product safety and environmental requirements
- R&D Commitment: Over 100 engineers in a modern Research & Development Center and around 190 patent applications
- Awards: Winner of the Kotler Awards Poland 2024 in the Impact Brand category
- Energy Efficiency: Energy Star compliant glass, warm spacers, perimeter gaskets, and double gasket sealing
- Safety Features: topSafe system for enhanced burglary resistance
Business Partnerships
FAKRO operates through co-owned subsidiaries in multiple countries, giving them a direct presence in important markets. This localized model allows them to adapt to specific market needs while maintaining centralized manufacturing and R&D in Poland.
Their distribution network spans more than 50 countries, and their reputation as an innovative brand opens doors for partnerships with industry professionals worldwide.
Bottom Line
FAKRO brings focused expertise, innovation, and energy efficiency to the roof window market. Their wide range of accessories and installation-friendly features make them a favorite among contractors and architects. However, because they specialize in roof fenestration, you will need to look elsewhere if you require a broader range of general window types.
3. Vallisco
If you own or manage a villa, hotel, inn, B&B, or residential project in Southeast Asia or Europe, Vallisco is here to supply the doors and windows that fit your style, budget, and performance needs.
A subsidiary of Qeeka Home, Vallisco benefits from over 24 years of experience in the doors and windows industry. Qeeka Home began in 2007, acquired its own manufacturing facility in 2019, and in 2024, Vallisco was established to operate independently while drawing on the same expertise and resources.
Our products are designed and manufactured with both function and style in mind, tailored to suit modern homes, commercial spaces, and hospitality properties. We focus on multi-unit orders for property owners, builders, and project teams, but if you are a homeowner replacing several doors and windows, we are happy to work with you too.
- Website:https://www.vallisco.com
- Address: Building 1, No. 1926, Cao An Highway, Jiading District, Shanghai, China 201824
Key Products
Doors
- Exterior Doors: Garage, Security, Steel, Fire, Copper, Aluminum Alloy, Energy-Saving, Radiation Protection
- Interior Doors: Glass, Solid Wood, Engineered Wood, Composite Panel, Mother and Son, Hidden, Swing, Pocket, Folding, Barn, Modern Minimalist, Chinese Style, Industrial Style
- Specialty & Functional Doors: Automatic, Soundproof, PD, Balcony, Sunroom, Revolving, Iron, Outward Opening, Center Pivot, Rolling Shutter, Airtight, European Style, Entrance, Double, Louver
- Sliding Systems: Sliding, Corner Sliding, Sliding Stacking, Lift-and-Slide, Slide & Fold
Windows
- Casement & Hung Windows: Single-Hung, Double-Hung, Fixed, Awning, Top-Hung, Folding, Outward Opening, Inward Opening
- Sliding & Specialty Windows: Horizontal Sliding, Sliding, Lift-and-Slide, Roof, Skylight, Balcony, Sunroom
- Performance Windows: Soundproof, Burglar-Proof, Thermal Break Aluminum, Insulated Glass, Composite
- Design & Feature Windows: Arched, Picture, Louver, Jalousie, Glass-to-Glass, Slim-Frame Aluminum, Slim Aluminum, Integrated Screen
- Commercial Systems: Curtain Wall, System Windows
Services Provided
Vallisco delivers a complete supply solution, from helping you choose the right styles for your property to ensuring safe, on-time delivery. We work directly with project owners, architects, contractors, and developers to match our products to design, function, and budget requirements.
Because we control our own manufacturing, we can offer custom sizes, materials, and finishes, ensuring that your doors and windows meet your exact specifications for performance, climate resilience, and aesthetics.
Certifications and Quality Assurance
- ISO-Certified Manufacturing: Ensures consistent product quality and performance
- Material and Safety Compliance: Meets relevant industry safety and environmental standards for target markets
- Performance Testing: Products tested for durability, weather resistance, and energy efficiency
Business Partnerships
Vallisco builds long-term relationships with builders, engineers, architects, and property owners. Our market presence in Southeast Asia and Europe is supported by a growing network of international clients and partners.
Being part of Qeeka Home gives us strong production capacity, advanced technology, and a proven track record of delivering large-scale projects.
Bottom Line
Vallisco offers a wide selection of doors and windows built for style, durability, and climate-specific performance. Our heritage, backed by Qeeka Home’s resources, means you can rely on us for consistent quality and dependable supply for projects of any scale. However, if you are only looking for a single door or window, we may not be the right supplier unless it is part of a larger home replacement project.
4. Kömmerling
If you build or supply windows and doors, you know how important the right profiles are. That’s where Kömmerling comes in. Since 1897, they’ve been creating the uPVC profiles that form the backbone of high-quality frames used all over the world.
Today, they supply manufacturers in nearly 100 countries, giving you access to proven components that combine strength, energy efficiency, and design flexibility. As the flagship brand of the profine Group, they bring over a century of experience along with the scale and resources to meet your project needs.
Kömmerling focuses on making profiles, not finished windows, so you can choose exactly how to customize, assemble, and finish the product for your customers. It’s a partnership approach designed to give you the tools to create frames that perform and last.
- Website: https://www.koemmerling.com
- Address: Profine GmbH, Kötztinger Str. 1, 93426 Pirmasens, Germany
Key Products
- uPVC Window Profiles: Multi-chambered designs such as C70 Gold® and O70 Gold® for superior insulation and strength, lead-free Greenline compound, customizable colors and finishes
- uPVC Door Profiles: Strong and secure profiles for residential and commercial doors, compatible with multi-point locking systems
- Sliding Door Profiles: Low-threshold, weather-resistant designs with smooth operating track systems
- PVC Sheets: Industry-leading extruded PVC-U sheets for signage, exhibitions, and building applications
- Adhesives and Sealants: High-performance products for insulating glass and other construction and industrial applications
Services Provided
Kömmerling puts its B2B partners at the center of its operations. They run regular training programs to keep fabricators and installers up to date on best practices.
Their on-site support covers everything from helping commission new installations to conducting quality checks and assisting with certification processes. Partners also receive detailed technical documentation to guide fabrication, and the Kömmerling UK Installer Network connects trusted professionals for collaboration and shared success.
Certifications and Quality Assurance
- ISO Certifications: ISO 9001 for quality, ISO 14001 for environmental management, ISO 50001 for energy management, and BS OHSAS 18001 for health and safety
- VinylPlus® Product Label: Sustainability certification for PVC building products, re-certified in 2024
- Environmental Product Declarations: Verified performance data for 2-pane and 3-pane insulating glazing
- Recycling Initiatives: Recovinyl Certificate, RSB Certificate for bio-attributed PVC, founding member of Rewindo recycling program
- Sustainability Commitment: Climate-friendly manufacturing and closed-loop recycling systems
Business Partnerships
Being part of the profine Group gives Kömmerling the backing of sister brands like KBE and TROCAL, along with shared R&D resources.
They focus on long-term, trust-based relationships with their customers, delivering tailored solutions backed by responsive technical support. Industry engagement is also a priority, with active roles in associations like EPPA and sustainability programs like Rewindo.
Kömmerling invests in high-profile sponsorships, such as its partnership with German football club 1. FSV Mainz 05, reinforcing its visibility and brand reputation worldwide.
Bottom Line
Kömmerling brings unmatched expertise in uPVC profiles, a strong commitment to sustainability, and a partner-first approach that supports manufacturers from design through to delivery. Their products combine performance, and long-term reliability. However, because they supply profiles rather than finished windows, you will need a trusted fabricator to turn those components into your final product.
5. Fenesta Building Systems
If you are working on a project in India and need windows or doors, there is a good chance Fenesta will be on your shortlist. As part of the DCM Shriram Group, a conglomerate with roots going back to 1889, Fenesta has grown into the country’s leading brand for uPVC and aluminum windows and doors.
They have made over 5 million installations so far, reaching customers in more than 900 Indian cities and expanding into markets like the Maldives, Bhutan, Kenya, and Nepal. With strong financial backing from DCM Shriram and a focus on 100% customized solutions, Fenesta offers you the ability to get exactly what you need, from design to installation and after-sales care.
Whether you are building for a luxury apartment, a high-rise in a coastal city, or a commercial space that demands performance and style, Fenesta’s team and nationwide network are set up to deliver.
- Website:https://www.fenesta.com
- Address: 12th Floor, Building 8C, DLF Cyber City, Gurugram, Haryana 122002, India
Key Products
- Windows: uPVC and aluminum options across Premium, Luxury, Super Luxury, and Ultra Luxury series; styles include Casement, Sliding, Tilt and Turn, Fixed, Bay, Glass-to-Glass, Louvers, and Villa Windows; features include noise and thermal insulation, moisture resistance, termite resistance, and integrated insect screens
- Doors: uPVC, aluminum, and Solid Panel options; Designer, Hybrid Material, and Engineered Wooden Doors; styles include Slide & Fold, Slider, and Casement Doors with secure multi-point locking
- Quality & Innovations: Patented rain track system, Hurricane Bar for extreme weather, Fusion Welded Joints, and testing for various Indian weather conditions
Services Provided
Fenesta’s “end-to-end” model is designed to make your life easier. They handle everything from the first consultation to final installation and after-sales support.
You get a personal site survey, custom design, manufacturing, delivery, professional installation, and even post-installation cleaning and handover. They offer up to 20-year warranties, AMC (Annual Maintenance Contracts), and 365-day customer service. For inspiration, you can visit one of their physical showrooms or explore their virtual showroom from anywhere.
Certifications and Quality Assurance
- ISO Certifications: ISO 9001:2015 for quality management, ISO 45001:2018 for health and safety, ISO 14001:2015 for environmental management
- Testing: Profiles tested at BSI in the UK to EN 12608 standards; performance testing by the Shriram Institute of Industrial Research in New Delhi; energy simulations by CEPT in Ahmedabad
- Awards: Brand of the Year 2025–26, Brand of the Decade at Goalfest 2024, multiple Superbrands India awards, Most Trusted Brand of the Nation, Product of the Year from ABID, and recognition as a sustainable organization
Business Partnerships
Fenesta’s position in the market is strengthened by its parent company, the DCM Shriram Group. They are a founding member of the Indian Green Building Council, showing their commitment to sustainable construction practices.
With a network of over 500 fabricators, they can deliver customized solutions quickly and efficiently across a vast geography. This reach allows them to serve everything from individual home renovations to large-scale developments.
Bottom Line
Fenesta combines national market leadership with the flexibility to serve projects of all sizes, offering customized products backed by a true end-to-end service model. Their quality is validated by certifications, testing, and industry awards. However, because they focus primarily on uPVC and aluminum systems, they may not be the right fit if you need other framing materials like steel or timber.
6. Dowell
Not many window and door companies can say they have been in business since before the light bulb became common in Australian homes. Dowell has been part of the country’s residential building scene since 1860, making it one of Australia’s oldest and most experienced manufacturers.
Proudly 100% Australian-owned, Dowell employs more than 850 people and operates locations across the country, giving you easy access to their products and support. They focus on innovative solutions tailored for Australian homes, including designs for net-zero-energy and passive house construction.
Their longevity comes from knowing the local market inside and out, staying committed to quality, and adapting to changing building needs.
- Website: https://www.dowell.com.au
- Address: Multiple locations across Australia
Key Products
- UrbanLine™: Minimalist, durable windows and doors designed to maximize light and ventilation; window styles include Awning, Casement, Double Hung, Fixed, and Sliding; door styles include Sliding, Sliding Stacking, and Corner Sliding Stacking
- DesignerLine™: Architectural-inspired range with Awning, Bi-fold, Fixed, Louvre, and Sliding Windows; Bi-fold and Hinged Doors
- ThermaLine™: High-efficiency range designed to meet NCC 7+ star energy ratings; Sliding, Fixed, and Awning Windows; Sliding, Sliding Stacking, and Corner Sliding Stacking Doors
- TimberLine™: Natural timber windows and doors for classic style; includes Awning, Bi-fold, Casement, Double Hung, and Fixed Windows; Sliding Stacking, Bi-fold, and Entry Doors
- Security & Screening: Permanent perimeter systems to enhance safety
- Customization: All products are made to order for your exact specifications
Services Provided
Dowell offers guidance on caring for your products so they last for years, along with a seven-year guarantee on windows and doors and two years on moving parts.
You can visit one of their Product Selection Centres to view samples and discuss your project in person, request quotes online, or contact them for general inquiries. They also provide clear installation requirements that align with Australian Standards to ensure top performance and warranty validity.
Certifications and Quality Assurance
- Australian Standards Compliance: All products meet AS2047 requirements
- Industry Memberships: AGWA, WERS, NSSA, NATA, MBQ, HIA
- Energy Efficiency: ThermaLine™ range meets NCC 7+ star energy ratings
- Sustainability: Suitable for net-zero-energy and passive house projects
Business Partnerships
Dowell’s memberships in major Australian industry bodies reinforce their commitment to quality and best practices. They are a trusted supplier for advanced projects, including sustainable builds like net-zero-energy and passive houses.
Bottom Line
Dowell brings over 160 years of experience, a broad product range, and a proud commitment to Australian-made quality. Their focus on sustainability and compliance with national standards makes them a dependable choice for residential projects. However, as their focus is on the domestic market, they may not be the right fit if you are looking for large-scale international supply.
7. All Weather Windows
If you have ever built or renovated a home in Canada, you know how important it is to choose windows and doors that can handle the country’s tough climate. That is exactly what All Weather Windows has been doing since 1978.
Now Canada’s largest privately-owned window and door manufacturer, they operate large-scale plants totaling over 261,000 square feet, two commercial offices, their own glass manufacturing division, and a network of nearly 800 dealers nationwide.
Their “Built in Canada, Built for Life” philosophy means every product is designed for real Canadian conditions, from freezing prairie winters to humid coastal summers. Whether you are a homeowner, builder, or contractor, they aim to deliver products that stand the test of time and weather.
- Website: https://www.allweatherwindows.com
- Address: 2020 32 Ave NE, Edmonton, AB T6T 1N6, Canada
Key Products
- Windows: Casement, Slider, Hung, Picture, Awning, Fixed, and Folding styles
- Series: Apex (Apex Alloy 9950, Apex 9100, Summit 9700, Atmosphere folding window), Horizon (Alpine 6700, Ascent 6100), Terrain (Terra 2700, Terra 2750, Terrano 2100, Basement windows)
- Materials: Acrylic wrap, aluminum-clad uPVC, and uPVC
- Doors: Front Entry, Folding, Garden, and Sliding doors in fibreglass smooth, fibreglass textured, steel, and uPVC
- Decorative Glass Inserts: Custom options for enhancing door aesthetics
- Interior Glass: Additional glass solutions for inside the home
- Customization: Wide range of made-to-order windows and doors for unique projects
Services Provided
All Weather Windows offers full installation services along with consultations, financing options, and guidance for programs like the Clean Energy Improvement Program.
They operate Customer Solution Centres in Alberta, British Columbia, Saskatchewan, and Manitoba, making it easy to get support. Their dealer network of nearly 800 locations ensures you can find their products and expertise close to home. After-sales support includes a strong warranty program, and technical documents like SDS and NFRC performance data are available for reference.
Certifications and Quality Assurance
- ENERGY STAR® Partner: Multiple-time Manufacturer of the Year; over 400 products designated “Most Efficient”
- InstallationMasters™: Alberta installers certified for best practices
- Better Business Bureau: Accredited since 1992 with an A+ rating in Edmonton and Calgary
- RenoMark™: Adheres to national renovation standards and ethics
- Built Green Canada: Member promoting green building practices
- Canada’s Best Managed Companies: Platinum Club winner
- CSA Certified: Meets applicable international standards
- Standards Compliance: Aligns with AAMA, ASTM, NFRC, and USGBC standards
Business Partnerships
All Weather Windows strengthens its brand through partnerships with programs like ENERGY STAR® and Built Green Canada, and through memberships like RenoMark™.
Their dealer network of nearly 800 locations supports nationwide distribution, and their industry standards compliance keeps them aligned with best practices in manufacturing, sustainability, and performance.
Bottom Line
All Weather Windows combines Canadian manufacturing expertise with products built specifically for the country’s extreme climate. Their energy efficiency credentials, and robust service network make them a trusted choice for builders and homeowners alike. However, as their operations are focused on the Canadian market, they may not be the right fit if you are looking for large-scale supply outside of North America.
Conclusion
When I think back to that first overseas order that doubled in lead time, I realize it could have been avoided with the right supplier from the start.
That’s why I built this list, so you don’t have to learn the hard way.
These top 7 window frame manufacturers have proven they can deliver on time, with the quality your projects deserve. Don’t gamble with your deadlines or your reputation.
The right partner is out there, and now you know where to look.
Contact Vallisco today, your next reliable window frame manufacturer.
