Our Certifications and Memberships

The Glass and Glazing Federation

The GGF exists to promote best practice and helps to set high technical standards. The Federation is recognised by the UK government and plays a large part in setting the new standards that control the way our buildings are constructed.

They are an invaluable source of technical information for us, and give us added confidence that the products we supply are correct for your project. Our GGF 2020 Membership Certificate can be found here.


Our FENSA Insurance Backed Guarantee Certificate can be found here.


A leading Danish manufacturer which offers Scandinavian-style windows with a flush exterior, Rationel is one of the most common requests from our customers. Whether you are looking for a modern or traditional solution, Rationel should have you covered. Our distributor certificate can be viewed here.


Another premium-quality Danish manufacturer, STM stands out for their finishing quality. Their timber paint finish goes beyond industry standard, and they guarantee the use of knot-free timber heartwood.

Not only do STM offer timber-only and composite windows, they can also provide an oak solution for a truly traditional product. To see our distributor certificate, click here.


If you require a bespoke timber window with that little bit extra, Danish company Vrogum is one of our main recommendations.

Offering timber products in a wide range of shapes and sizes, Vrogum are the only people we will recommend for timber sliding sashes.

Indeed, Vrogum’s Svarre division offers something truly unique. For an ultra-modern building, look no further than their windows which feature a flush all-glass exterior. Click here to view our distributor certificate.


Checkatrade runs strict background checks on tradespeople before they can become members. Once they join, members agree to have feedback from their customers published online for all to see. Find our Checkatrade membership certificate here.

Which? Trusted Traders

Which? allows consumers to access more than 8,000 impartial, in-depth, product reviews to help them find the best option for themselves. Find our Which Trusted Traders membership certificate here.