The National Association of Building Contractors (NABC) is a UK-based organization that connects homeowners with vetted and accredited builders. It ensures professionalism and quality in the home improvement sector by adhering to strict standards for its members. NABC provides free services to consumers, offering access to multiple local builders for quotes on various projects, from renovations to new builds. The association also offers support and resources to its members, helping them grow and promote their businesses.