I paid similar fees about 3 years ago, except that the structural calculations cost only £35 for a single storey extension and detatched double garage. Architects fees included Planning Application cost.
i.e. Have you been quoted for the fees that are paid on you behalf to the authority for the plan approvals (Building Control) and perhaps planning approval as well (if applicable).
Remember you will also have to pay for inspection fees if the works go ahead.
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