• Welcome to ADCO Composite Windows and Doors

ADCO Glazing is an authorised and approved distributor and installer of the Rationel range of composite aluminium windows and doors to commercial and domestic clients in Wales, Midlands and the South West.

At ADCO Glazing, we are dedicated to focusing on all of our clients’ requirements, from the initial enquiry through to on-site advice and assistance where we have built up an outstanding reputation for customer satisfaction.

We can offer supply only or supply and install via our network of approved Rationel installers. No matter how complex your requirements are, we will have a solution to meet your needs.



Rationel bespoke windows and doors are available in timber or timber clad with aluminium. Please select the product you are interested in for more information.



At ADCO we offer a wide range of windows in modern and classic styles for both new build and refurbishment projects. This makes it easy for you to find the products that match your house. Today our product range covers almost any imaginable need or architectural style.



Doors are central to how you feel about your home. They are the way into your home and its eyes on the world outside. They are your connection to the outside world, and what protects you from it.


Durability & Security

Rationel offers high-performance windows and doors designed to deliver long lasting quality for many years. This series of videos demonstrates how our products are tested to meet the highest standards of security, durability and weather tightness.



Ideas and imagination are highly appreciated at Rationel. Whether the creative ideas come from you, the architect or the carpenter, they should not be stopped by standard solutions. We produce special units for both refurbishment and new build projects.



A selection of Rationel-brochures.

  • About Rationel Windows and Doors

Good, solid, quality workmanship has characterised Rationel’s windows and doors since the first products were shipped from our factory in Sdr. Felding in 1954. Based on this sound foundation, Rationel is today an international company with sales offices in Great Britain, Ireland and Denmark.

Rationel manufactures energy saving windows and doors of premium quality in terms of both comfort and security. Our continuous programme of research and development ensures that the company always meets current statutory requirements as well as market requirements for design and functionality.

  • Contact Us


07411 259 717 / 029 2010 2466


[email protected]

Opening hours:

Mon – Sat: 8:00 – 17:00


8 Cowbridge Rd West, Cardiff CF5 5BR