The ADU Handbook

Adding a second unit to an existing residential property can be a challenging undertaking. We wrote this book to give homeowners a step-by-step guide to building an Auxiliary Dwelling Unit or a Tandem House on a residential lot. An ADU (also known as a granny flat, carriage house, cottage, in-law apartment, home office, or rental property) or Tandem House can capitalize on the increasing demand for single-family homes, by allowing more residents to live on a single-family lot at a reasonabl...