It鈥檚 good news that the regulations are becoming more onerous in England. However, in Scotland we have had minimum U-values for conservatories for some time
If you class the conservatory as an 鈥渦nheated space鈥� and don鈥檛 install any heating in it, then you don鈥檛 have to make thermal trade-off calculations with the rest of the house. What normally happens next is that the client gets everything signed off by building control, and then installs a radiator or electric heater in it 鈥� totally defeating the point of thermal efficiency. Of course, the best thing to do is to advise the client not to install conservatories at all 鈥� too hot in summer and freezing in winter. Better to install a sun room (in my opinion).
Eric Miller
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