A residential remodelers license or residential builders license or home improvement license are not needed to do works on a single-family residence, if the Plumbing project worth does not exceed $ 2,000, including labor and material.
A residential builders license is for single-family residence to be built
A residential remodelers license is for major structural changes to a single-family residence to be made.
A home improvement license is for performing special jobs in a single-family home such as painting, roofing, flooring, etc.