Truly modular building datacenter facility

A modular datacenter facility is constructed with a set of building modules of different types of functionality to form an entire datacenter facility having a standardized pre-approved architectural design and layout. All instances of a particular type of building module will have approximately a same floor plan and architectural design. An initial set of building modules can be built upon a parcel of land, and then as needs of space and additional capacity of the modular datacenter facility increase, then at a future point in time additional building modules of the different types can be rapidly added to the initial set of building modules. The building modules of the different types use one or more connecting corridors architected into at least a first type of building module and corresponding aligned doorways between both building modules to interconnect two building modules adjacent and abutted to each other.