If you purchase windows from this firm beware of their service. We have had numerous problems with the Kolbe windows we purchased in terms of delivery and product quality. When we went back to Ridley to have the deficiencies rectified they completed some items but not others. Then try and get them to come back! I have never dealt with a firm that has left me so exasperated. They seem to operate on the back of an envelope. There are no systems in place to ensure that work has be done, done properly, or done to the customer's satisfaction. I was quite vocal with senior management but they seemed to be either dismissive or uncaring. When I have mentioned my predicament to others the response has been "Oh, I've heard that about them". Wish I'd heard that before buying windows from Ridley.