Because you’re exploring information on double glazing, you are obviously a person who makes considered decisions based on solid verifiable facts.\ \ CertainTeed does. We CAN proudly guarantee that we ‘deliver’. We’ve done so for 24 years.\ \ We may not be the ‘cheapest’ ... but often ‘cheapest’ isn’t the most cost effective solution. Dealing with award winning CertainTeed, you can have the confidence in a company built on strong foundations, with a perfectionist approach to manufacturing & double glazing, and a passion for service and design. We have thousands of happy clients with double glazed windows and doors, still pristine, that span back those 24 years. In short, when you deal with CertainTeed, you can be assured that we\'re here for the long haul, standing behind our guarantee!\ \ What that means is that in another 24 years ... your double glazed windows and doors will still look like new, open and close as smoothly as ever, and they will perform superbly. AND with so much importance on protecting our environment, your uPVC windows and doors will have the very best ‘green’ credentials! Can you take a chance on anything less?\