noun
DIY; weekend carpentry; do-it-yourselfer
Refers both to the hobby of doing home improvement or woodworking on weekends, and to the person who does it. Often used in the phrase 日曜大工をする.
父は日曜大工で本棚を作った。
My father built a bookshelf as a weekend carpentry project.
彼は日曜大工
His hobby is DIY.