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Plans are essential so the builder can price and contract what is shown. Even if it changes later, those changes can be quantified. A draughtsman can draw plans for a few thousand dollars and advise if approval is required and an engineer can give concrete and steel designs for a few hundred dollars and may even design the roll off roof support frames.
Why would a builder invest his time and money quoting if you have not invested a some time and money drawing what it he is to price. Without plans his quote might be undermined by another less qualified builder which is a common risk.
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