High Performance Windows & Doors For The UK Market

Established in 1992, Janex delivers cutting-edge, durable windows and doors across the UK, reflecting a legacy of quality and innovation offering our clients the perfect solution. 

Trusted By Many

Janex has earned the trust of countless clients, from residential builders to large commercial contractors, through consistent delivery of top-quality products and service

Welcome To JANEX

For over 30 years, Janex has worked with the leading names in the building industry to manufacture and supply high performance timber windows and composite doors.

10 Years Product Warranty

Benefit from 10 years of assurance with our warranty, guaranteeing lasting quality and performance in every Janex product.

Nationwide Reach

Enjoy peace of mind with our nationwide coverage, ensuring reliable and timely delivery of products across the UK

Custom Solutions For Unique Builds

Tailored offerings including large sliding doors, bi-fold doors, and custom-shaped windows, perfect for both grand designs and modest extensions.

Unwavering Commitment to Quality and Service

Experience consistent, top-quality service for every project, big or small, backed by our long-standing dedication to customer satisfaction.

Previous Projects

Explore our portfolio of previous projects and see the Janex difference for yourself.


Discover Excellence: Explore Our Range of Windows and Doors

From bespoke residential windows to robust commercial doors, our diverse range caters to all architectural needs. Experience the perfect blend of style, functionality, and innovation in every Janex product.

JANEX Product Range

Our Products

Acoustic Solutions

Our acoustic windows expertly reduce external noise, ensuring a peaceful and serene indoor atmosphere.

Bi-Fold Doors

Our bi-fold doors combine efficiency, with superior thermal and acoustic performance with customisable glazing, colours, & advanced hinges.

Fire Doors

Unparalleled safety and durability, extensively tested.


Janex offers a diverse range of windows, including Fully Reversible, Tilt & Turn, and Casement, each designed for optimal performance and customizability to suit any architectural style.

Bring Your Vision to Life - Get Your Quote Now

Ready to elevate your space with our bespoke windows and doors? Reach out today for a personalised quote and let’s start crafting your dream project together with Janex’s expertise and unrivaled quality.