The Swedish Building Wood Workers' Union (Swedish: Svenska Byggnadsträarbetareförbundet, Btaf) was a trade union representing carpenters in Sweden. The first union of the name was founded in 1904, as a split from the Swedish Wood Workers' Union, but it rejoined in 1916. On 1 January 1924, the Wood Workers' Union was split into the Swedish Wood Industry Workers' Union and a new Btaf. Like its predecessor, it affiliated to the Swedish Trade Union Confederation. In 1925, the small Swedish Parquet Layers' Union joined Btaf.