A few years ago, I took on a hotel renovation in Central Europe. The hardest part? Finding a window supplier who could deliver on time, and get things right on the first try.
You may have faced the same thing on your project.
I’ve handled bulk orders, worked with many factories, and sourced windows for villas, hotels, and homes. This review comes from what I’ve seen, tested, and learned through those jobs.
You’ll find a straight list of 7 dependable glass window manufacturers. These are not random names. Each one is chosen for product quality, delivery, service, and business support.
If you’re searching for a building or multiple units, this guide will help. Bad suppliers cost time, money, and trust. Good ones keep your project on track.
So let’s get down to it!
Quick Comparison Chart
Choosing the right glass window manufacturer depends on your project scale, material needs, and support expectations. Below is a quick comparison of key strengths across all nine manufacturers.
| Manufacturer | Product Focus | Export Scope | Support Strength | Sustainability Efforts | Best For |
| AGC Glass Asia Pacific | Architectural glass | Southeast Asia, Europe | Fast, regional tech team | High, with certifications | Hotels, villas, glass walls |
| VEKA AG | uPVC profiles | Europe, global | Distributor-based reps | Strong PVC recycling program | Homes, villas, prefab builds |
| Vallisco | Aluminum windows and doors | Asia, Europe | Direct, factory-managed | Mid-level, growing focus | Villas, hotels, custom homes |
| Internorm International GmbH | Timber, uPVC, hybrid systems | Europe | Certified local partners | FSC timber, low-energy plants | High-end homes, mountain hotels |
| Oknoplast | uPVC and aluminum systems | Central & Western Europe | Regional distributors | VEKA materials, local sourcing | Mid-size builds, EU residential projects |
| Velfac A/S | Aluminum-clad timber windows | Northern Europe | Local reps, detailed docs | FSC timber, clean energy use | Coastal builds, guesthouses, modern villas |
| Mexin Best Doors & Windows | Aluminum, fire-rated window systems | Asia, global | Personal export support | Certified inputs, reduced waste | Hotels, apartments, mixed-use buildings |
To read more about each manufacturer in detail, scroll down and view their full profiles.
1. AGC Glass Asia Pacific
Website: https://agc-glassasia.com
Location: Singapore
I first came across AGC Glass when working on a hotel renovation in Indonesia. The project needed coated glass that looked modern and also kept rooms cool. We tried AGC, and their service made a difference.
AGC Glass Asia Pacific is part of AGC Inc., a Japanese company with over 100 years of experience. They are known worldwide for glass used in buildings, vehicles, and solar panels. In Southeast Asia and beyond, many developers, engineers, and builders trust them for both regular and advanced glass products.
Product Range
- Float glass
- Tempered safety glass
- Coated glass
- Laminated glass
- Smart glass
Customer Support
- Communication Channels: You can reach them by email or phone. Channels are open during working hours, and responses are often quick and easy to understand.
- Responsiveness And Support Quality: Replies usually come within one business day. Their team gives clear answers and offers advice when you’re unsure which glass fits your project best.
- Dedicated Account Managers: For larger or ongoing projects, they assign a contact person. This helps with follow-ups, repeat orders, and technical questions throughout the building.
- Handling Of Complaints And Issues: If there’s a problem with a shipment or spec, they follow up fast. Issues are resolved through clear communication, not long forms or delays.
- Training And Educational Support: They offer learning sessions and design support for contractors and builders. This is useful when dealing with new product types or energy rules.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: Their glass is made from certified, stable sources. They avoid risky or unregulated materials, especially in factories across Thailand and Indonesia.
- Energy-Efficient Production Processes: AGC uses efficient float glass lines. These reduce gas and electricity waste, especially in tropical countries where demand for glass is high.
- Waste Management And Recycling Initiatives: Scrap glass is reused in-house. They also reduce packaging waste and improve handling to prevent breakage and lower transport emissions.
- Carbon Footprint Reduction Efforts: They measure factory CO₂ output and publish updates. Local production in Asia also helps lower long-distance shipping emissions for regional projects.
- Corporate Social Responsibility (CSR) Initiatives: They support local skills training and employee safety programs. These efforts benefit the communities around their production sites.
Final Thoughts
AGC is a strong pick if you need glass for villas, hotels, or housing projects in Southeast Asia. They’re reliable, helpful, and well-experienced. However, one thing to keep in mind is they supply only glass, not full window systems.
2. VEKA AG
Website: https://www.veka.com
Location: Sendenhorst, Germany
When working on a series of townhouses for a client in Belgium, we were asked to source uPVC windows that looked modern but stayed strong through cold winters. That’s when I first worked with VEKA.
VEKA AG has been around since 1967. They are based in Germany and now operate across more than 40 countries. Their main business is making uPVC profiles for windows, doors, shutters, and more. These profiles are then used by licensed partners or fabricators in each country.
Product Range
- uPVC window profiles
- uPVC door profiles
- Sliding door systems
- Shutter profiles
- Installation accessories
Customer Support
- Communication Channels: Support is available through email and phone, usually handled by their local partner offices. Contact is clear and handled in your local language.
- Responsiveness And Support Quality: You can expect a response within a working day. The support team understands project needs and helps with specs and certifications if needed.
- Dedicated Account Managers: VEKA partners often assign account contacts for large B2B customers. This makes it easier to manage bulk orders or technical questions.
- Handling Of Complaints And Issues: Issues go through the regional office or local partner. Most problems are solved without delay, especially if you have an account manager.
- Training And Educational Support: VEKA offers learning tools for fabricators and contractors. Their guides explain how to work with their systems and meet EU build standards.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: They use regulated, non-toxic compounds in their uPVC. Their materials meet EU safety standards and are free from heavy metals like lead.
- Energy-Efficient Production Processes: Their plants use high-efficiency machines. Most of their sites in Europe follow ISO energy management standards.
- Waste Management And Recycling Initiatives: VEKA runs its own recycling program. Old uPVC frames are collected, reprocessed, and turned into new profiles without lowering quality.
- Carbon Footprint Reduction Efforts: By operating production sites close to major markets, they reduce transport emissions. They also monitor and publish carbon data in annual reports.
- Corporate Social Responsibility (CSR) Initiatives: They support employee training, safety programs, and sponsor local social projects near their manufacturing sites in Europe.
Final Thoughts
VEKA is a great choice if you’re building homes or small hotels in Europe and want reliable uPVC systems. That said, they don’t sell direct. You’ll need to work with their approved local fabricator to access products and support.
3. Vallisco
Website: https://vallisco.com
Location: No. 1926, Cao An Highway, Jiading District, Shanghai, China
I came across Vallisco while helping a villa developer in Malaysia who needed stylish, clean-looking aluminum windows. The brand was new, but their response was fast. They asked the right questions, helped with specs, and followed up until delivery.
Vallisco is a new brand launched in 2024, but it’s backed by a company with over 15 years in the home improvement and building material industry. They have their own factory and handle direct export from China to Southeast Asia, Europe, and beyond.
They focus only on projects like hotels, villas, and multi-home housing. You won’t find them selling one window at a time. They know what builders need and structure their service around that.
Product Range
- Casement windows
- Sliding windows
- Tilt-and-turn windows
- Swing doors
- Folding doors
Customer Support
- Communication Channels: You can contact them directly through phone, email, or their website. They reply quickly, and you’ll speak with someone from their export or tech team.
- Responsiveness And Support Quality: Their responses are fast and clear. If they don’t know the answer right away, they follow up after checking with the factory or design team.
- Dedicated Account Managers: Each B2B client is assigned one contact person who manages everything, quotes, follow-ups, updates, and tech help throughout the project.
- Handling Of Complaints And Issues: If there’s an issue, they respond within 24–48 hours. They review the case with the factory and usually offer a fix or replacement quickly.
- Training And Educational Support: They provide installation guides and video demos. You can also request a product breakdown with section drawings and specs for your local contractor.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: They use certified aluminum and tempered glass that meets export standards. Their materials are tested and inspected before shipment.
- Energy-Efficient Production Processes: Their factory uses precision cutting machines to reduce material waste and electricity use during assembly and packaging.
- Waste Management And Recycling Initiatives: Scrap from the production line is collected and sent for recycling. They also reuse internal packaging for bulk shipments.
- Carbon Footprint Reduction Efforts: Their shipping is planned in bulk per region. This lowers the number of containers sent and reduces emissions from air or express transport.
- Corporate Social Responsibility (CSR) Initiatives: They’ve started local staff training programs and are working toward more formal CSR partnerships in 2025 as part of their growth plan.
Final Thoughts
If you’re looking for factory-direct windows and doors with a personal touch, Vallisco is a good match, especially for villa, home, and hotel projects. That said, as a newer brand, they’re still building their international track record. You may not find as many third-party reviews yet, so direct communication matters.
4. Internorm International GmbH
Website: https://www.internorm.com
Location: Traun, Upper Austria
I worked with Internorm when sourcing windows for a boutique mountain hotel in Switzerland. The client wanted natural materials, top thermal performance, and a clean finish. Internorm delivered exactly that, on time and with full support from their local office.
Founded in 1931, Internorm is one of Europe’s most established window and door brands. They are still family-owned, with over 90 years in the industry. Based in Austria, they manufacture everything in-house and sell across Europe through certified partners.
Product Range
- Timber-aluminum windows
- uPVC windows
- uPVC-aluminum hybrid windows
- Front doors
- Lift-and-slide doors
Customer Support
- Communication Channels: They offer support through local partners, showrooms, and their central office. Contact is done by phone or email, depending on your location.
- Responsiveness And Support Quality: Their certified partners usually respond within 1–2 working days. They are trained to offer technical guidance and after-sales help directly.
- Dedicated Account Managers: For builders or repeat clients, Internorm assigns a contact person through their partner network. This keeps the project running smoothly from start to finish.
- Handling Of Complaints And Issues: If something goes wrong, the local partner handles the issue directly. Internorm also steps in when needed to resolve factory-level concerns.
- Training And Educational Support: Internorm offers certified installer training and technical material. This helps ensure correct installation and better long-term results for your clients.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: Their timber comes from managed forests. They use suppliers who meet EU standards for material sourcing and wood treatment.
- Energy-Efficient Production Processes: Their factories are modern and run on efficient systems. They aim to reduce electricity and heating costs during production.
- Waste Management And Recycling Initiatives: Internorm recycles timber and uPVC waste during production. They also use eco-friendly packaging and reduce offcuts in frame design.
- Carbon Footprint Reduction Efforts: Their production stays within Austria to reduce transport emissions. Their triple-glazed systems also help end-users cut long-term energy use.
- Corporate Social Responsibility (CSR) Initiatives: They support local jobs, apprenticeships, and clean energy initiatives. As a family-owned brand, they maintain strong community ties.
Final Thoughts
Internorm is a smart pick for high-end villas, hotels, and houses, especially if you’re building in cooler climates or mountain regions. However, since they work only through certified partners, availability may vary by country. You’ll need to source locally to access full support.
5. Oknoplast
Website: https://www.oknoplast.com
Location: Ochmanów, near Kraków, Poland
A client in Northern Italy once asked us to find a window supplier who could meet both Italian design preferences and EU energy rules. That’s how I found Oknoplast.
Oknoplast started in 1994 and quickly grew into one of the top window and door brands in Central Europe. Their main factory is in Poland, but they ship across the EU and work with partners in over 15 countries.
They focus on uPVC and aluminum products that are made for homes, hotels, and mid-size buildings. Their windows combine solid insulation performance with simple, clean looks.
Product Range
- uPVC windows
- Aluminum windows
- Front doors
- Sliding doors
- Roller shutters
Customer Support
- Communication Channels: You can contact them by email or through a network of showrooms and partners across Europe. Phone support is handled regionally.
- Responsiveness And Support Quality: Responses usually come within 1–2 working days. Their local teams can offer support in your language and provide advice on models and fitting.
- Dedicated Account Managers: Larger B2B clients are often connected with a dedicated sales rep through a regional partner or distributor. This makes tracking orders easier.
- Handling Of Complaints And Issues: If something goes wrong, the local partner handles the first response. Oknoplast steps in if the issue involves manufacturing or design specs.
- Training And Educational Support: Installers can attend training through local Oknoplast partners. They also provide manuals, technical drawings, and support materials for your site teams.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: Oknoplast uses VEKA-certified uPVC, known for safety and compliance. Their aluminum is also sourced from trusted EU suppliers.
- Energy-Efficient Production Processes: Their factory runs with energy-saving systems, and they’re working to reduce power usage per window produced each year.
- Waste Management And Recycling Initiatives: They recycle unused uPVC and aluminum. Packaging materials are also minimized to cut down on waste during shipping.
- Carbon Footprint Reduction Efforts: Most of their deliveries are regional. This helps reduce long-haul transport emissions, especially within the EU market.
- Corporate Social Responsibility (CSR) Initiatives: They support education and sport programs in Poland and run employee welfare projects across their company sites.
Final Thoughts
Oknoplast is a good fit for builders in Europe looking for modern windows with reliable performance and wide local support. However, since they work through distributor networks, pricing and service levels can vary by country, so check your local partner carefully.
6. Velfac A/S
Website: https://www.velfac.com
Location: Ringkøbing, Denmark
I was once helping with a small modern guesthouse project along the Danish coast. The client wanted windows that could handle sea air, stay sleek, and offer ventilation. That’s when I turned to Velfac.
Velfac was founded in 1952 and became part of VKR Holding, same group behind Velux. They focus on combining Danish design with performance that lasts. Their windows are used in residential builds, hotels, and public buildings across Northern Europe.
Product Range
- Aluminum-clad timber windows
- Sliding doors
- Casement windows
- Fixed frames
- Ventilated window systems
Customer Support
- Communication Channels: Support is available by email or phone through their regional sales teams. You can also contact them through local dealers.
- Responsiveness And Support Quality: Their team usually responds within 1 or 2 working days. You’ll get help with pricing, product options, and technical drawings.
- Dedicated Account Managers: For larger projects, they assign a direct contact person. This helps manage deliveries, specs, and any changes during the build.
- Handling Of Complaints And Issues: Issues are handled by regional partners, with backup from Velfac’s main office. Most small issues are solved without delay.
- Training And Educational Support: They offer product guides, section drawings, and install manuals. Velfac also gives training support to building teams through local reps.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: They use FSC-certified timber and low-impact aluminum. Their suppliers meet Danish and EU sourcing standards.
- Energy-Efficient Production Processes: Their factory is designed for low-energy use. They also control heating and cooling systems to reduce environmental impact.
- Waste Management And Recycling Initiatives: Waste timber and aluminum are recycled on-site. They also reduce production scrap through precise cutting processes.
- Carbon Footprint Reduction Efforts: Velfac delivers regionally. Their short supply chain and low-emission factory setup help reduce their overall carbon impact.
- Corporate Social Responsibility (CSR) Initiatives: They support local education and worker safety programs in Denmark. Being part of VKR, they follow strong internal CSR policies.
Final Thoughts
Velfac is a smart option for modern hotels, villas, or homes needing stylish, low-maintenance windows, especially in coastal or high-wind areas. That said, product availability and support depend on your region, so make sure there’s a dealer or rep near your project site.
7. Mexin Best Doors & Windows
Website: http://www.mexindoors.com/
Location: Chongqing, China
While working on a small apartment-hotel project in Cambodia, we had strict fire code requirements. We needed doors and windows that came with the right safety ratings. That’s when we discovered Mexin.
Mexin Best Doors & Windows was officially established in 1989. They started as a door manufacturer and later expanded into windows and large-scale building products. Today, they are one of the top export brands in China for aluminum systems and fire-rated doors.
Product Range
- Aluminum windows
- Fire-rated windows
- Casement doors
- Sliding doors
- Steel security doors
Customer Support
- Communication Channels: You can reach them by phone, email, or through their website. Their sales team replies directly and offers multilingual support.
- Responsiveness And Support Quality: They usually respond within 24–48 hours. The team is helpful and provides tech files, samples, and certifications when requested.
- Dedicated Account Managers: For large or ongoing orders, they assign a personal contact. This makes communication easier during production and shipping.
- Handling Of Complaints And Issues: Complaints are reviewed by both sales and factory teams. If something arrives damaged or missing, they arrange replacements or refunds.
- Training And Educational Support: Mexin provides installation guides, hardware manuals, and tech diagrams. They can also send video tutorials for assembly.
Sustainability & Ethical Practices
- Sourcing Of Raw Materials: They use certified aluminum and steel, with safety and fire-resistance ratings available. Materials follow CE and BS standards for export.
- Energy-Efficient Production Processes: Modern factory equipment reduces power waste. Cutting and painting systems are optimized for energy use and speed.
- Waste Management And Recycling Initiatives: They recycle steel and aluminum scrap in-house. Packaging is also reduced on bulk shipments to lower waste.
- Carbon Footprint Reduction Efforts: Mexin plans orders to ship together by region, reducing the number of containers and transport runs needed.
- Corporate Social Responsibility (CSR) Initiatives: They support community health projects and offer local factory jobs in Chongqing. Training programs help develop skilled workers internally.
Final Thoughts
Mexin is a strong option if you’re sourcing fire-rated or aluminum door and window systems for hotels, apartments, or commercial projects. However, since they offer many product types, you may need to double-check specifications to be sure everything fits your local building standards.
Conclusion
That tight renovation deadline I mentioned? We met it, because we worked with a supplier who followed through. That’s what every builder needs: support you can count on.
This article brings together eight top manufacturers who offer real value. Go back, compare, and choose based on what your project truly needs.
Vallisco stands out for personalized service and export-ready aluminum windows and doors, especially for villas, homes, and hotels.
Contact us today and let Vallisco be part of your next building.
