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@rodabod
The thing is, it's all very well getting structural engineers and architects involved, but that doesn't necessarily mean that it would pass building control. My girlfriend is an architect and designed our small extension, but the original wall cavity did not meet building control's specifications and so was revised. They also visit at various points during construction to make sure that you are following what was specified on paper.
The existing small extension which we demolished before building the new one didn't have building control sign-off or planning permission. Our builder asked me to dig down to see how deep the existing foundations were. They were only 0.4m whereas building control demand 1.2m (although this is circumstantial).
A friend of mine moved into a house nearby me with an existing loft extension. The previous owners didn't bother having things done properly, and when it reached winter my friend found that the attic was unusable as there was no insulation installed!