I would like to lien properties when we are having trouble getting paid for the work we do, but I obviously don't want to lien a property if we are required to have a license for what we do. I've been told we don't need a contractor's license for what we do in CA, but then I saw an old posting stating that a restoration company in Northern CA got fined for not having a license. Our work consists of light demolition to surface-level materials (drywall, base/trim, cabinets, flooring, countertops, etc.), disconnecting appliances and plumbing (ovens, dishwashers, refrigerators, toilets, sinks, washer/dryer, etc.), and other services like putting up plastic containment, running and monitoring drying equipment, etc. What we don't do is any work to rebuild the property, we do not re-connect appliances or plumbing, and we don't do any demo on anything structural (studs in walls, shear wall, roofs, etc.). Is a contractor's license required to do what we do in California?