I really love doing home inspections on new homes. I come from a background in construction and I feel very comfortable in a spanking new home with the smell of new paint and the sparkling fixtures.
Over the years I have come to know that when it comes time to write the inspection report on a new home, here in Salem, Oregon one thing will almost always be present. The wood debris in the crawlspace.
Almost all of the time it is not the builder's fault directly, although by the time I am done it becomes his problem. It is usually directly related to sub contractors that are either lazy or inconsiderate or both.
The HVAC guys that cut a hole for the duct rarely manage to pick up their scraps.
The finish carpenters see a nice hole in the floor and figure, "That must be for my garbage."
All of that wood can and will become a nice, warm and wet place for wood Destroying critters to eat and breed and when they are done with that they will look to the next closest food source, your new home.
So, please Mr. Builder. save us all some time and trouble and let your subs. know that irresponsible control of work site debris shall not be tolerated.
Or continue as you have been and I will just add the "conducive conditions for Wood Destroying Organisms" to the punch list.