Extension

Some homeowners looking to maximize the livable space on their property decide to extend their existing home. These ADUs are connected to the house and are sometimes described as an “attached ADU”, “attached internal apartment”, or “addition ADU”.

This is a great option if you don’t have the room to build a detached ADU of your desired size. Also, extensions are typically are a little cheaper to build than detached units because less raw building material is needed.