Construction of building projects requires careful attention to the plans. Starting with ordering materials, the construction process requires practical working/production skills and requires finances, material, technical, and labor. Specialized labor (including plumbers, electricians, carpenters, and other contractors) can be required depending on the type and scope of the project. Later, when things break, require maintenance, or need upgrading, these same tradesmen provide the necessary repair work. Laws vary between states, but most areas require that contractors be licensed to take on work over a certain dollar amount. The state's licensing agencies are also the place to go if you need to file a complaint against a contractor for substandard or incomplete work.