What We Do?


Advanced Sealed Units Ltd manufacture and supply double glazed sealed units to contractors and glaziers which are used in doors, windows, conservatories and many more.

Our business is based on four basic principles; customer satisfaction, prompt delivery, the best quality and good relationships with customers and suppliers.

We are a growing company based in Welham Green, Hertfordshire within easy reach of all arterial routes leading in and out of London.


We aim to satisfy each customers query no matter how large or small. Without the support and hard work of both office and factory staff ASU would not be able to achieve our goals and reach the top of the market.

We are highly capable of undertaking mass production orders with the help of modern machinery and the best quality products and services in both domestic and commercial glazing.

We are one of the most technically superior glazing providers in the U.K.
with competitive prices and first class quality.

Orders are sent by our customers via fax or e mail which is the input on to
our computer system. The information is then printed onto labels with the customers own logo and a batch code which enables us to trace products and give instant updates on any order placed by customers.

An efficient and helpful team of staff are always on hand to assist with any queries. Our reputation is based on customer satisfaction which is evident throughout the company.