A system is described for collecting, maintaining, and using information about construction, maintenance, and use features of buildings and their components. One or more building identifier tags affixed to a building during construction include a unique building identifier for the building and access information allowing a user to access a computer-implemented repository of information about the building. The repository may comprise information about components in the building, which may be identified in the repository by product identifiers, as well as information about component manufacturers, warranties, installation and maintenance instructions, information about workers associated with construction of the building, and quality checkpoints useful for checking and documenting the quality of construction for the building. The repository may also facilitate registration of warranties, transmission of safety and recall information associated with building components, targeted marketing of offers to residents of the building, as well as other communications amongst parties associated with the building.