Mission Concepcion consists of a sanctuary, nave, convento, and granary. When originally built, brightly painted frescos decorated both the exterior and interior of the building.
Traces of the frescoes still exist on the weathered facade of the building. Experts restored some of the artwork on the interior ceilings and walls of the convento in 1988.
The Archdiocese of San Antonio completed another restoration of the mission's interior in 2010 which exposed more frescoes in the sanctuary and nave.