大水溝二手屋的三大宗旨，分別為：舊物再生、弱勢就業，與社區共好。 二手屋的貨源來自四面八方，例如民眾、地方代表、企業等合作單位捐贈的物品 為了打造一個良好的二手交易市場，保障消費者的權益及減少其顧慮，二手屋的工作人員會在收到物品時，深入了解其來源與故事，並對物品進行全面檢查及修繕，更提供消費者30天保固退換維修的服務。
The three main purposes of second-hand housing are: recycling of old items, employment of disadvantaged people, and sharing benefits with the community. The sources of second-hand houses come from all directions, such as items donated by the public, local representatives, enterprises and other cooperative units. In order to create a good second-hand trading market, protect the rights and interests of consumers and reduce their concerns, when receiving the items, the staff of the second-hand houses will have an in-depth understanding of their origins and stories, conduct a comprehensive inspection and repair of the items, and also provide consumers with 30-day warranty, return, exchange and repair service.