The present invention is a modular construction method for enclosures and counter assemblies. The counter assembly has a series of modules, which can be added or removed at will. The counter assembly comprises an innovative metal framework having modules connected by angled splices to enhance customization into variable shapes and sizes. Cross-supporting framework and perimeter rails may be added to incorporate customized components for drawers, shelving, appliances, storage, access doors, vents, and the like. The framework is capable of supporting countertops formed in a shape corresponding to the shape of the modular assembly. Side panels may be supported on the framework for purposes of enclosing the assembly, said panels being attached by a plurality of metal clips designed to fit into the metal framework with extensions designed to secure the side panels. The framework and components of the counter assembly are moveable, rearrangeable, and replaceable.