Even new construction needs to be inspected. Here are a few examples of problems that if not detected could lead to unexpected costs and avoidable stress.

Improper installation of gas connector at furnace 
Engineered floor joist has been cut during plumbing installation 
Engineered floor joist has been cut during plumbing installation 
Improper installation of joist hangers 
Improper installation of gas connector at furnace 
Engineered floor joist has been cut during plumbing installation
