Choose your sector


Our accredited network of installers offers the highest quality uPVC and aluminium products with excellent customer service.

Trade Customer

Access our latest technical information, product content, video archives, media centre, Sternfenster Plus and much more.

Approved Installer Benefits


Who Are Sternfenster?

Sternfenster are a one-stop shop for market-leading, premium quality products. Established in 1974, we stand as one of the industry’s leading manufacturers and trade fabricators of UPVC and aluminium windows, doors and sealed units.

How We Do Business?

How We Do Business?

We strive to give you more time for growing your business, which is why we offer our customers comprehensive and consistent support. This includes a practical online ordering and quoting system to ensure any sales run smoothly and efficiently.

Marketing Offering

Marketing Offering

Our media hub offers a wide selection of marketing resources, which can be used to promote business coverage and enhance business effectiveness. This system, available for Approved Installers, is a smart way to grow without the hassle.

Our Product Range

Our Product Range

Approved Installers gain access to exclusive standards of product quality, allowing you to simply offer more to your customers. All of the products we offer are market-leading, giving you the competitive edge you need in the industry. View Products.

A Partnership That Works

A Partnership That Works

We build our relationships on a ‘continual improvement policy’, which means we are always looking for ways to help you grow your business and increase your leads. Become a Sternfenster Approved Installer and secure yourself a prolific company with this exceptional support network.

Industry Leading Manufacturer

  • Sternfenster Approved Installer Network

    Postcode Installer Search for Homeowners

  • Sternfenster Approved Installer Network

    Leads In Your Designated Post Code Areas

  • Sternfenster Approved Installer Reviews

    Your Latest Customer Reviews Updated for You

  • Sternfenster Approved Installer Product Information

    Unique Marketing Assets: Videos, Images & Downloads

  • Join our network

    Exclusive Access to Extensive Content Via New Media Centre

  • Sternfenster Investment

    Benefit From Sternfenster's Huge Marketing Investment

Our Product Range

Hailed as a window design ‘where technology meets art’, the StyleLine range offers an exclusive and flawless aesthetic that is made possible by pioneering manufacturing techniques. This home improvement solution simply stands in a class of its own.

The manufacturing process includes the first of its kind graf quad welder. This ensures that when a StyleLine window or door is joined together, any plastic sprue is pushed inside the frame for a seamless finish. This also eliminates the need for corner grooving or loss of vinyl. 

Aluminium home improvements are becoming a highly sought after option for homeowners, enhancing designs to stand in line with modern demands. This means that you’ll be able to offer your customers the very best in performance and design.

Our comprehensive range of aluminium products will allow you to increase your customer base, featuring a selection of window and door styles that can be tailored to meet any home, taste or customer budget.

  • Mechanically Jointed Frames or Graf Welded Frames
  • Chamfered Profile Designs or Sculptured Profile Designs
  • Secured by Design Standards
  • Energy Rate for ‘A+’
  • Premium Hardware
  • 20 Year Guarantee
  • PAS24 /  Part Q
  • Triple Glazing
  • Comprehensive Product Range
  • StyleLine Windows and Doors
  • myAli Framing Solutions
  • Flush Sash Windows
  • Vertical Sliding Sash Windows
  • Postcode
  • Name
  • Contact Details

Find Your Nearest Approved Installer

Our network of approved installers guarantees you the best service and highest quality products.

Enter your Location

Enter Your Name

Enter Your Contact Details