Supplying to Trade, Commercial and Retail for 40 years Astraseal Group are one of the leading PVC-u and aluminium window, door and conservatory manufacturers and installers in the UK. Our wide and trusted range of products are recognised and respected across the industry, meaning you can be confident in receiving the highest quality product with the best possible customer service. All our products are manufactured from three state-of-the-art facilities in Northamptonshire and carry full industry accreditation.