First time home buyer with upcoming home and pest inspection

[Natanya Vidales]

I have a home and pest inspection scheduled next week and it was brought to my attention that in addition to the home inspector I should hire a plumber to check the lines and a structural engineer to check the structure of the home. I do plan on adding square footage to the basement area as it has been converted to a room but I would like it to be a larger room. Would it be wise to hire a structural engineer and a plumber in addition to the inspector? Any thoughts. The home was built in 1981. Its wood frame, roof is shake/shingle and its public sewer and water. Two stories build on an up slope from the street. Any suggestions are greatly appreciated.