Founded in 1978, Upstairs Design & Building Co specialises in upstairs additions and renovations in the Northern Beaches area. Over the last 30 years, Upstairs Design & Building Co has completed over 350 upstairs additions, as well as new houses and commercial projects.From new homes to renovations, each project is individually designed for your needs. Based on Sydneys Northern Beaches, Upstairs Design & Building Co has established itself as one of the leading design and construction companies in the area.