House behind house designs are a popular choice for those looking for a unique and innovative living solution. This type of design involves building a smaller house or granny flat behind the main house on the same block of land. This can be a great option for those who need extra space for family members, guests or a home office. The second dwelling can be designed to complement the main house or have its own unique style. It also provides privacy and flexibility, allowing occupants to live independently while still being close to family or friends. House behind house designs are also a great investment opportunity, as the additional dwelling can be used as a rental property to generate extra income.