All our casement windows are fitted with high security bi-directional locking points as standard.
Awards and Accreditations
What to do next?
Find your
product
Discover our industry leading products. We have a wide range of high quality windows and doors to enhance your home improvement project.
View our
brochures
Explore our market leading products in more detail by looking through our interactive brochures and watching our videos.
Find your local installer
We can put you in touch with a local trusted installer near you. Use our service to locate a qualified fitter in your local area.
Enjoy your new product
Once your high quality new products are installed, enjoy the peace of mind, looks and security that our products will give you for years to come.
Why choose Sternfenster?
Manufacturing for over 50 years
Family run business, established since 1974 with over 50 years industry experience.
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Industry leading products
We were the 1st fabricator in the UK to offer a seamless graf-weld on uPVC windows and doors.
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Approved Installer Network
Join our Approved Installer Network for exclusive product guarantees, marketing materials, business mini-site and monthly lead generation.
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Fast delivery from as little as 5 days
We supply industry leading windows and doors from just 5 days.
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Over 50 Years at Sternfenster
Join us as we celebrate our 50th year in business with a chance to win prizes!
Find out why our customers rate us
We are one of the most transparent manufacturers in the industry. We’ve got nothing to hide. Learn all there is to know about Sternfenster and why it makes sense to choose us as your supplier of choice to help you grow.
Don’t waste time, sell with Sternfenster today
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Exclusive trade offers
Join us and take advantage of exclusive trade offers from Sternfenster today.
Windows
Shaping The Future Of Windows
We manufacture market leading windows that provide your home with exceptional security, energy efficiency and stunning aesthetics.
Our popular casement windows are hinged to one side and feature a single lever latch design for simple and smooth operation. These windows can be installed throughout the home thanks to their hugely practical design.
Doors
Strong, Secure, Energy Efficient Doors
Our low maintenance, colour fast, long lasting doors will give your home a beautiful look which will last for many years.
For products like our uPVC doors, there is no more painting or staining. All it takes is a simple wipe clean to keep your door looking as good as new.
Aluminium
Low Maintenance Aluminium
Our aluminium doors are cost effective, energy efficient and highly secure. All our designs are aesthetically pleasing and can add value to your home.
Naturally strong, low maintenance aluminium frames will keep your home secure but with no compromise on energy efficiency thanks to polyamide thermal barriers.
the future
Business Support
Sternfenster Business Support & Guidance
Grow with one of the UK’s leading fabricators. Our award-winning services will help you to build your reputation as a business, providing you with all the materials you need to drive and increase your sales.
We are fully aligned with the latest trends and developments in uPVC and aluminium double glazed windows and doors. Leverage our expertise and realise your business potential. Start selling from us today or become a part of our national network.
Fast Lead Times
Products From Just 5 Days
Why wait 5 weeks when you can have it in 5 days?
We utilise advanced manufacturing techniques and in-house spraying to deliver quality products when you need them. We can offer quicker lead times than our competitors, with speedy delivery options to your building site.
Any colour, any style – For colour frames, we offer fast turnarounds for uPVC and aluminium windows in virtually any style you request. Get a quote today.
Sustainability Leaders
Recyclable Products
We are at the forefront of the mission to reduce carbon emissions within the double glazing industry. We make energy efficient windows and doors that offer next-generation thermal performance.
In addition, we ensure our uPVC and aluminium profiles are sourced sustainably. This way, our products can be recycled easily into new windows and doors at the end of their product life. Learn more about sustainability at Sternfenster here.
our support
Message Us on WhatsApp!
For a quick response from a member of our team, send us a message on WhatsApp.
Industry Leading Windows and Doors
We know our industry leading products will meet all your expectations and more. Discover how you can transform your home with Sternfenster today.
Join the ranks of satisfied customers who have experienced the Sternfenster difference firsthand.
Trusted by our customers
Discover why Sternfenster is trusted by our customers. Take a look at our case studies and authentic customer testimonials below. Find out how how we’ve consistently delivered exceptional products and service satisfaction.
Join the ranks of satisfied customers who have experienced the Sternfenster difference firsthand.
For more than 50 years we have manufactured …
570221
uPVC Windows
381220
Aluminium Windows
120310
Bi-Fold Doors
Our Recent Projects
View some of our most recent projects and see what customers have to say about us. We have supplied everything from modern new builds to traditional properties and renovations.
We are one of the largest, and most established names in the double glazing industry.
Awards and Accreditations
We are a multi-award winning fabricator, renowned throughout the industry for the quality of service we provide.
We are the industry leaders
Help your customer to enhance their home with fully accredited, quality made windows and doors. All of the options we offer have been tried and tested to ensure that they offer the highest standards of thermal efficiency, security and durability.
uPVC Range
Look no further than Sternfenster for uPVC. At our cutting edge facility, we use the latest manufacturing techniques to ensure our products are ahead of our competitors. Our uPVC windows are high performance and fully recyclable.
Aluminium Range
Our aluminium range is sturdy, corrosion resistant and long lasting. We build them with environmentally friendly materials for high performance, aluminium products.
Industry Leading uPVC Range
Look no further than Sternfenster for uPVC. At our cutting edge facility, we use the latest manufacturing techniques to ensure our products are ahead of our competitors. Our uPVC windows are high performance and fully recyclable.
High Performance Aluminium Range
Our aluminium range is sturdy, corrosion resistant and built to last. We build with environmentally friendly materials for high performance, aluminium products.
Energy Savings Calculator
Use our energy savings calculator to find out how much upgrading your windows can save you in the long run.
Latest News
VIEW ALL NEWS
10
Dec '25
Understanding U-values – What They Mean for Your Home
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10
Dec '25
Why Smart Windows & Doors Are The Future & What Trade Installers Should Know
Read More
18
Nov '25
Selling the Value: How to Justify Your Quote with FENSA, Accreditations, and Local Quality
Read More
13
Nov '25
The perfect partnership
Read More
Latest News
VIEW ALL NEWS
10
Dec '25
Understanding U-values – What They Mean for Your Home
Read More
10
Dec '25
Why Smart Windows & Doors Are The Future & What Trade Installers Should Know
Read More
18
Nov '25
Selling the Value: How to Justify Your Quote with FENSA, Accreditations, and Local Quality
Read More
13
Nov '25
The perfect partnership
Read More
Find Your Approved Installer
Find your nearest approved installer with Sternfenster today.
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Start Selling Sternfenster Today
Get in touch today with enquires for any of our market leading products. Sell the best with Sternfenster.
Become An Approved Installer
Grow your business with an award winning manufacturer. We’ll support you with materials and expert guidance every step of the way.
Outsource Fabrication To Sternfenster
Looking to outsource for any of your projects? Get started today. We will provide you with expert guidance for your trade success.
