Abstract: Techniques are described for using one or more computing devices to perform automated operations related to presenting simulated visualizations of building interior information in a user-customized manner. In at least some situations, the building is a house, and the described techniques include providing a graphical user interface (GUI) that is displayed on a client computing device to an end-user (e.g., as part of a provided Web site), and via which the end-user may customize at least some aspects of the building interior in accordance with defined constraints, such as partner-defined constraints that are specified by a partner entity associated with the house, and/or system-defined constraints that are specified by an operator of the system providing the GUI. Various additional associated functionality and information may be provided in at least some embodiments, including to generate and provide information associated with a particular customization created by a particular end-user.