Use NewHomeGuide.com to locate new homes for sale and new home builders in New Castle County, Delaware. We have one of the largest selections of New Castle County homes for sale in print or online. Our New Castle County homes section includes new single family homes, condominiums, custom homes, luxury properties and townhomes for sale in New Castle County. You can search New Castle County houses and homes by using our search form or by browsing the links below for new communities, home builders and new homes in New Castle County. Registered users get the added benefit of saving New Castle County new homes and communities to their account for free.