About Us HSA Architects is a Sydney based architectural practice which has undertaken work on projects from inner Sydney to the North Coast. The practice offers a wide range of services from concept design and site assessment to development application and contract documentation as well as advice during the tender and construction stages. The principle Hugh Slatyer is a chartered architect with almost 40 years experience in a wide range of building types from individual housing to unit and townhouse developments and SEPP5 projects. In addition to new houses we work with clients on alterations and additions to existing houses in the Sydney area. Many of these are small houses built early last century and need to be expanded and upgraded within the Council planning controls and budget restrictions. Our clients are broadly based from individual householders to development companies, who want the attention and experience of the principle architect. Hugh Slatyer has been the recipient of a number of design awards over the last 20 years.