Abstract: A modular countertop structure is described. It is supported by an underlying base and has a flat unedged surface-providing sheet supported by the base and having an edge including a peripheral recess, a preformed elongated edge facing with a rearward extending tongue which fits into the recess, and adhesive for directly bonding the sheet to the edge facing through their adjacent surfaces in the recess. The countertop sheet and the edge facing are made of materials which are impervious to moisture penetration, impact and scratching, including natural stone, synthetic stone-like material, ceramic, concrete, glass-like sheets, agglomerated stone, cement materials, metal or terrazzo. They may be made of the same or contrasting materials, so that the edge facing and the countertop present appearances which are the same or consistent with each other. In some embodiments, an underlying substrate will also be used to support the countertop sheets.