We always recommend that you either use a licensed builder in your area or from the region close to your home so they are sure to understand the local climate or code requirements. Both Washington and Oregon require that you have a license before building a structure over a certain size or handling special types of construction like plumbing and electricity. In addition, if you’re not an experienced professional, you’re likely to make mistakes that could cost a lot of money to repair. The money you save from doing work yourself will likely be eclipsed by needed repair work in the future.