A post, beam and arched member modular building is shown. The modular building may be formed into any number of different configurations and different structures. The system relies upon a box shape formed from four vertical members, with an arched member extending between each of the adjacent vertical members. The rear vertical members being higher than the front vertical members, with angled members, or rafters extending from the rear vertical members (or a cross-member at the same height thereof) to the front vertical members (or the corresponding arch). In the configuration shown, the angled members or rafters are co-planar. The structure has substantial symmetry and aesthetic design.