The idea of retrofitting is certainly nothing new, especially for historic buildings. But the Yannell PHIUS+ House project is turning a home built in the 1890s into a Passive House complete with modern style and amenities. The project, renovated by HPZS, is the first certified single-family Passive House in Chicago. The Yannell House was awarded PHIUS+ certification in 2018, but it has also gathered a number of other accolades.