Home Inspection recommended I get a structural engineer, Licensed Electrician and HVAC & Plumber.  

I am currently in college as an engineering major and I'm getting ready to move back to D.C. after I graduate (I am from there originally).

Structural Engineer. 417-554-3493.

We already cleared it through the city and are working on getting a structural engineer out to see if we can build on top of the existing building or have to demolish and start new.  

If they give you the green light, I would speak with a civil engineer and have them draw site plans.

._______________________________2.5% upon commencement of schematic and engineering design ($11,250)2.5% upon completion of schematic and engineering design ($11,250)2.5% upon completion of construction drawings ($11,250)2.5% upon obtaining all necessary approvals of plans ($11,250)Total: 10% out ($45,000)5% upon commencement of demolition work ($22,500)5% upon completion of all demolition work ($22,500)Total: 20% out ($90,000)10% upon commencement of foundation work ($45,000)10% upon completion of all foundation work ($45,000)Total: 40% out ($180,000)10% upon commencement of framing work ($45,000)10% upon completion of all framing work ($45,000)Total: 60% out ($270,000)5% upon commencement of plumbing work ($22,500)5% upon commencement of electrical work ($22,500)5% upon commencement of insulation work ($22,500)5% upon commencement of drywall work ($22,500)5% upon commencement of tile work ($22,500)5% upon commencement of roof work ($22,500)Total: 90% out ($405,000)10% upon completion of customer punch down list and job completion ($45,000)Total: 100% out ($450,000)

If you haven't, you ought to explore the opportunity to reduce your taxes with a good quality engineering-based cost segregation study.

But with the build - starting next spring sounds reasonable but you should be talking with architects and engineers now, as most of the local companies are booked up and the planning and building departments are backlogged.  

Question: When you have foundation questions, should you call a structural engineer to inspect or a foundation repair company?

Full time structural engineer and beginner investor here, I would recommend starting with your local government building services department.