Backyard apartments, also known as accessory dwelling units (ADUs), are capturing the attention of homeowners and urban planners alike. These compact, self-sufficient spaces are built in the backyard of a primary residence, providing an innovative way to address housing shortages. By offering rental opportunities, guest accommodations, or additional living quarters for family members, they bring versatility to property owners. Beyond personal benefits, backyard apartments contribute to urban density without new infrastructure, making them an eco-friendly choice. As their popularity rises, understanding the design, benefits, and challenges these units present becomes increasingly important.