"Measure Twice, Cut Once,” says carpenter law. It's most likely that your home improvement job will involve wood, a carpenter's specialty. Carpenters cut, fit and fasten wood for a variety ofuses inside and outside the home. They frame walls and partitions, put in doors and windows, build stairs, lay hardwood floors and mount kitchen cabinets. They either work through a contractor or are self-employed. Carpenters have to follow local building codes which often detail the types and specifications of material used. There are no strict training rules, so carpenters learn their skills through various training programs or on the job. Carpenters are becoming more specialized in their skills, although it shouldn't be difficult to find one with a broad range of knowledge.