The present disclosure describes a modular building system and method adapted to achieve a more efficient and durable longer-term building solution that can resist adverse weather conditions, natural disasters, and common building material degradation for years or decades, and can be built on remote sites that may otherwise be cost prohibitive to build permanent structures using more conventional building methods. In accordance with an illustrative embodiment, the modular building system comprises of a modular unit that is formed into a unitary building structure that may be interconnected laterally or vertically to form two or more floors.