Is it sustainable to reuse building elements from existing houses in new construction projects? Is there a real effect of building in wood? And is there enough waste at all if everyone builds with upcycled materials? The short answer is yes. In just over 380 pages the book, Solution, documents the effect by showcasing the two projects, Upcycle Studios and Resource Rows. With extensive use of recycled and upcycled materials, Lendager's projects, Upcycle Studios and the Resource Rows, have already garnered awards and publicity as lighthouses in circular construction. With the sweeping data from LCA and LCC analyzes, the release now proves that there is a real sustainable effect to be gained when building circular.