A modular seating system including at least two horizontally oriented support members and at least one core base component of recycled plastic having a top and a bottom adapted to engage the horizontally oriented support members. The plastic core base component includes a series of feature attachment points molded directly into the top and the bottom of the plastic core base component, and the bottom of the plastic core base component includes defined receptacles for at least four vertical support members. The modular seating system may include a core back and armrest component adapted to engage the horizontally oriented support members and the core base component and the feature attachment points.