Epwin Window Systems is a leading manufacturer of advanced, low-emission PVC-U and aluminium window and door systems, serving the fenestration and construction sectors. Epwin Window is part of Epwin Group, the UK’s foremost building material manufacturer encompassing an array of construction materials from guttering, rooflines, decking, cladding and fascia systems.

With over 50 years of experience, we’ve earned the trust of the social housing, private residential, and education sectors by delivering energy-efficient, durable, and user-focused solutions with minimal environmental impact.

Epwin Window Systems offers one of the largest product portfolios in the industry, featuring trusted brands such as Profile 22, Spectus, Stellar, and PatioMaster, alongside stand-alone systems. This broad range enables specifiers to source both PVC-U and aluminium products from a single manufacturer.

All products are Secured by Design and PAS 24:2022 certified and come with a standard 10-year manufacturer guarantee.

Our brands

Profile 22

An award-winning system built for the future, Profile 22 features a unique 6-chambered outer frame and 5-chambered sash for superior insulation and reduced energy loss. With a proven track record across residential and education sectors for over 40 years, it combines performance with reliability.

Spectus

A versatile, easy-to-fit system with a fully integrated design and wide range of ancillaries, ensuring a perfect fit for both traditional and contemporary projects. The 5-chambered profile, with options for steel and thermal reinforcements, delivers high security without compromising thermal performance.

PatioMaster Inline Sliding Door

A sleek, slimline patio door designed to maximise natural light and create seamless indoor-outdoor transitions. Available in 2, 3, 4, or 6-pane configurations, with spans up to 6 metres. The easy-glide tracking system ensures long-lasting performance and enhances building aesthetics.

Stellar Aluminium System

A multi-award-winning system with some of the slimmest sightlines on the market. From casement windows and bi-fold doors to flush tilt-and-turn windows, Stellar is designed for trouble-free installation. Patented knock-in beads speed up glazing and leave a clean internal finish. Made from up to 100% recycled aluminium, Stellar supports our closed-loop sustainability approach.