October 29, 2012. Carbon Monoxide Detectors: Guaranteed to Fail in 7 Years. To help prevent illness and death, some states require carbon monoxide alarms to be installed in various parts of your home. Kidde is one of the large, recognized brands of smoke alarms and other fire prevention products. Certain of their carbon monoxide detectors, however, come with conflicting promises and warnings.
Extensions are more expensive: RICS gives a guide cost of between Â£1,260 and Â£1,680 per square metre for an extension with plastered finish. So a 20-square metre single-storey extension will range from Â£25,200 to Â£33,600 â before you've put down flooring or installed a kitchen. Side extensions must be single storey with a maximum height of 4m. 2  If the extension is within 2m of a boundary, the maximum eaves height should be no higher than 3m. 3  A single-storey extension must not extend beyond the rear of the house by more than 3m for an attached house or 4m if the house is detached.
Related articles: The ultimate guide to extending your home | 10 ways to cut the cost of your extension. How much will an extension cost? There are many factors involved in costing an extension project, from the size of the project right down to the quality of the paint you use on the walls. For a basic breakdown of average extension prices, follow these guidelines: From Â£1,500 per mÂ² for basic construction work, up to Â£3,000 per mÂ² for high-spec materials. If youâre adding bi-fold doors, allow Â£1,400 to Â£1,800 per metre for these. Small extensions, under 15â20 square metres, have higher costs per square metre. Clay, peat, lots of nearby trees and sloping ground will all increase foundation costs.