Design load calculation for headers, I joists, rafters on an existing house renovation - 11/02/2023 07:51 EST

Complete design calculations for headers over windows, I joists over ceiling , 8’ door opening on a support wall and rafters for a roof extension. Plan available, but city has requested specific calculations to support sizing vs what was submitted via lumber yard design.Engineer or architect must be U.S. and must be able to certify work.needed . Preferable to complete within a week.