Excellent answer by J. Andrea Lard.
I'm not aware of any pest control that is performed before a home is built. I was a community sales manager for Engle and Richmond American Homes for six years before coming to PML in Longmont.
On a new build, the builder does barrier wrapping of the outside walls. The insulation in a basement is about a foot thick. The house is thoroughly calked and sealed. Paint offers some protection, too. Watch a home under construction in the early stages, and you can appreciate that it takes a very determined pest to get at any food in a home. But, they find a way.
Commonly, pests hitchhike their way into a new home. Corrugated cardboard offers an excellent place for insect eggs. Tip: Get rid of your boxes after you move.
The good news, as Andrea has noted, is pests from other regions are usually unsuccessful in getting established in a Colorado home.
Native critters adapt or move out to less populated areas (where suburbs are built). The creatures that made a living close to the farm that occupied the property before it was turned over to development are frightened off by the noise and rumblings of construction. Once the construction is gone, they may migrate back for a free lunch left by a picnic table. Field mice, spiders and snakes are animals that adapt well to living with people. If you like cats, cats are notorious for controlling critter populations.
PML of Longmont, CO