Structural engineers can be contracted through the architect or builder, but often the homeowner contacts an engineer directly. When doing so, it's important to make sure the structural engineer is registered, professionally licensed through the state. The engineer will make a site visit to evaluate the desired modifications, look at original structure plans, and assess the impact. Depending on the project, he'll do some measuring, and possibly some surveying, particularly if perimeter drainage issues are involved or if soil has washed away from the foundation.

Before the site visit, homeowners should know what they want to do and how quickly they would like it done. The owner might want to know if his home is on soils that expand when too much moisture is introduced. Structural engineers can advise on preventive solutions for problems that may arise from expansive soil, saving the homeowner future difficulties.

-- Tips courtesy of HomeAdvisor.com