An attached accessory dwelling unit (ADU) in California is becoming an increasingly common construction project. These types of ADUs attach to the main structure and serve as separate living spaces for family members or renters. Structural engineering considerations are essential for attached ADUs as these must be built in such a way that they seamlessly blend with existing structures and conform to local building codes. This means that the size, shape, materials and construction process must all take into account the existing property on which it will be attached and other features of the attached structure. The added rigidity that is required from working with attached dwellings is something that experienced structural engineers can help ensure while ensuring that throughout the process all regulations are also observed.