Residential architecture focuses its design and building on residential properties. These projects include multi-unit residential buildings, single-family homes, renovations and remodels. Things like heating, ventilating and air conditioning (HVAC) and electrical systems are approached differently. Designs tend to be focused on aesthetic appeal, and there can be more creative freedom with projects. Zoning regulations, building codes and materials are other differences in residential architecture. As this type design is very specific for individual situations, your needs and wants are paramount in this area of interior design.