Spread a layer of mulch or wood chips around new construction homes before or immediately after exterior finishing is installed.
This will help prevent the staining of siding and masonry work if it rains. It also helps for contractors to work around the perimeter of the house if it is muddy.
This is especially important if you are building in an area with clay soils and using light colored finishes. Splashback from rainwater and the soil will cause staining to a brand new home quickly.