A modular void form is described. Embodiments of the modular void form can include a panel and at least one reinforcement member. The panel can include one or more scoring lines which the panel can be folded about. When the panel is folded, a tubular structure having a flange can be formed. The panel can include a plurality of slits that form slots when the panel is folded. The reinforcement members can be adapted to be removably inserted into the slots of the panel and engage the flange of the folded panel.