With increasing focus on energy efficiency and rising energy costs, thermal performance has never been more important. Our hardwood sliding sash and casement windows are designed to achieve excellent thermal performance, we offer windows with a U Value as low as 1.0 that help keep heat inside your home. We are proud to be among the few joinery manufacturers across the UK and Ireland offering windows engineered to this high standard.

Not only are our windows certified with an excellent U Value, they have also passed the Wintech Weather Testing process for air leakage, water and wind.

PAS 24 is a test standard used to assess the security performance of windows and doors. Our products have been tested and meet the lastest part Q requirements.

The CE mark is a mandatory conformity marking for certain products sold within the European Economic Area. The CE marking is a visible sign that the product complies with all relevant product supply laws. Millar apply the CE mark to all of our products.

Compared to other durable wood species, Accoya wood offers superior thermal insulation, which provides energy conservation advantages when used in applications such as window frames and doors.

A visit to our showroom is without doubt the best way to see our great range of products and materials as well as being a great source of inspiration, you will get to see the care and craftsmanship that go into every single product.