Abstract: The present invention resides in a modular building construction for a vehicle oil change and lubrication center. The building comprises at least two components. Each component is a prefabricated section. One of the components is a one-piece below-grade vault, preferably of cast reinforced concrete. The vault has a floor and upstanding walls, and is dimensioned so that it can be transported on a truck-trailer bed. The vault has an open top. A second component comprises an above-grade enclosure. The above-grade enclosure is supportable by the walls of the below-grade vault. The above-grade enclosure has a floor opening, and a door access for a vehicle which allows a vehicle to be positioned over the floor opening. The floor opening is aligned with the vault open top and permits access from the enclosure to the vault. Means are provided releasably holding the enclosure to the vault.