The more the dwelling unit develops, the more complex its structures get. They will have new requirements as they surpass their underdeveloped precursors. Raw materials are needed to build every structure group, and during the service period of a building, some of them need to be replenished from time to time. Maintenance crews come into the picture at this point. This crew’s responsibility is to ensure all structures are safe and intact at intervals. In doing so, they automatically collect all the necessary raw materials from your storage depots and use them in their place of duty. In case of a lack of supply, a series of events can cause a building to suffer damage to a certain extent or come to ruin.