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Liniar Renews Membership with Secured by Design

Derbyshire-based window and door systems company, Liniar, a subsidiary of Quanex, has renewed its membership with Secured by Design (SBD), the official police security initiative.

Founded in 1974, the UK-manufactured Liniar brand has grown to become one of the UK's most innovative ranges of PVCu extrusions, with windows, doors and conservatory profiles supplied to fabricators, including a wide number of SBD members, to be made into finished products.

Liniar's aim is to be recognised as a leading force for quality and excellence in product development, fusing industry experience with innovation, sustainability and loyalty. To this end, the company has launched many UK-first products, including the first bespoke PVCu bi-fold door, the first double-rebated PVCu flush sash window system and the first Passive House certified PVCu casement window amongst others.

Staff in the Extrusion Hall at Liniar

Liniar works with several SBD approved fabricator companies who fabricate the following Liniar profiles to Secured by Design standard:


  • Liniar Chamfered / Sculptured PVC-U Residential Door System
  • Liniar Zero|90 PVC-U Door System
  • Liniar ModLok™ PVC-U Bi-Folding Door System
  • Liniar ModLok™ PVC-U Patio Sliding Door System
  • Liniar Alumina Aluminium Bi-Folding Door System


  • Liniar Chamfered / Sculptured PVC-U Window System
  • Liniar Zero|90 PVC-U Window System
  • Liniar Resurgence 80mm Flush Sash PVC-U Window System
  • Liniar Top Swing Fully Reversible PVC-U Window System

Liniar Casement Windows in Agate Grey

Paul Garforth, Technical Services Director at Liniar, said, “It’s important to us here at Liniar that our products are fully tested and meet all the industry standards for security and performance, especially when launching a new product. SBD is not only the recognised name in the industry but also trusted more widely across different sectors and the general public. It gives end users the confidence of knowing that their Liniar products have been subjected to rigorous testing when they see the SBD logo.”

Alfie Hosker, Secured by Design, commented, “Liniar offers a wide range of systems to a significant number of SBD door and window fabricators. The company has held membership with us spanning across three decades now and I look forward to a successful continued association.”

You can find out more about Liniar and its Secured by Design accredited products on its dedicated member page.

Secured by Design (SBD) is owned by the UK Police Service with the specific aim of reducing crime and increasing safety for businesses and individuals.

SBD seeks to improve the physical security of buildings and the surrounding area using products such as doors, windows, locks and walling systems along with fencing systems that meet the SBD Police Preferred Specification security requirements.

SBD have many partner organisations, ranging from the Department for Levelling Up, Housing and Communities through to local authorities, housing associations, developers and manufacturers and work closely with standards and certification bodies.

SBD is the only way for companies to obtain police recognition for security-related products in the UK, through the Police Preferred Specification - a product-based accreditation scheme developed over 20 years ago, which provides a recognised standard for all security products that effectively deter and reduce crime. SBD work with manufacturers and standards authorities to ensure that security standards are current and updated to keep pace with emerging crime trends.

Learn more about Secured by Design and our member companies at: