A semi-detached sale refers to the purchase of a property that is attached to another property on one side, but has a separate entrance and is considered a distinct unit. This type of sale is common in residential real estate, where two houses share a common wall, but have separate ownership and living spaces. Semi-detached sales offer a middle ground between detached homes and attached properties, providing homeowners with the benefits of both privacy and shared maintenance costs. These types of sales are popular in urban areas where space is limited, and offer a more affordable option for buyers looking for a single-family home.