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<p>The Building Regulations have been changed twice in the last five years to strengthen
energy requirements by over thirty percent. To meet these demanding performance-based
standards, new buildings need more insulation, better windows, efficient heating or
renewable systems.<br><br>Also, the Building Regulations were amended in 2012 to require
notification that an analysis of the feasibility of using high efficiency alternative
systems, including renewable energy, has been carried out before new construction
commences.</p>
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