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In many cases it is not possible to retro-fit any extra locks to UPVC windows. Where a building is listed, planning authorities usually require existing windows to be retained and repaired where possible, unless they are clearly falling to bits and cannot be repaired, or are later additions which are obviously the wrong design for the building. Based in London we are a recognised registered double glazed window and door repair and replacement doctor with many years combined experience. Our defender II window is the flagship of our range and the envy of our industry, we have mastered and engineered our defender replacement keys for double glazed windows upvc window range to perfection, with a host of industry leading security features, leading-edge heat loss prevention plus they look fantastic with plenty of style. It turned out that fitting double glazed window cleaner magnetic double-glazed sealed units into bare frames on site was a distinctly hit or miss affair and soon the NHBC, the housebuilders' main warranty provider, was swamped with complaints from angry new homebuyers about their windows misting up, only to find out that the NHBC warranty didn't even cover glazing defects. For example, if you pay $1,000 per year in energy bills, have 20 windows in your house, and 22 double glazed windows for caravans percent of your energy is lost through your windows (which is average), then each window is losing $11 worth of energy quote for double glazed windows per year. Not all double glazing is equal when it comes to cutting the heat loss from your home. An energy efficiency rating system is applied to cost of replacement glass for double glazed windows all double glazing products to measure how effective they are at reducing heat loss. Some standard double glazing windows may for example start at a C rating and offer some level of protection. Even if you haven't got Double Glazing Windows but like your current design and layout of your current windows we can make your new double glazing windows to match your preferences. The best Double Glazing Windows are ones that you want, not the product that a Salesman wants to sell to you in order to achieve commission. Whatever your requirements, from a single window repair to a complete double glazing installation, you can rely on the dedicated team here at Lee Glass & Glazing. Our A Rated UPVC windows and NEW Aluminium Range incorporate a neutral Low Emissivity (Low E) Planitherm Total Plus glass with argon gas and a warm edge spacer bar. Triple glazing is far superior in terms of thermal efficiency than standard glazing options approximately 60% more thermally efficient than standard C-rated double glazed windows, and 40% more than standard A-rated double glazing - therefore saving your clients thousands on heating bills and providing you the opportunity to sell a higher margin product. Fact - The insulation properties of secondary glazing are far lower than those offered by true double glazing - and especially those offered by Low E double glazing. The most efficient Low E glasses have a special coating applied online using a process known as magnetron sputtering. Fact - Offline coatings , which are applied after the basic sheet glass has been manufactured and cut, were previously considered less resistant than online coatings. Our range of 70mm casement windows means that chunky windows are a thing of the past. It can be built and maintained by a person of modest skill; and at minimal cost. During the whole of that period in just moderately cold weather the old windows were dripping in condensation, so much so that we had to place towels on the window sills each night and wipe all the windows every morning.