Get a beam size wrong and the wall above it will not care about your deadline. It sags, slowly, until a crack runs along the ceiling. Structural accuracy is not decoration it's what holds the roof up. Engineers check load paths, soil conditions and existing foundations the unglamorous bits that stop your extension from becoming a liability. Skip it and building control bounces the application straight back. Get it right first time and you save weeks of resubmissions and arguments with contractors who refuse unapproved drawings.
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