Abstract: A modular housing system made up of wall panel units, roof panel units and floor panel units. Each unit is a framework made up of members which are preferably wooden or metal 2.times.4's or other readily available shape. The units are uniformly predrilled for connectors in such manner that they can be readily rotated into a variety of orientations and yet register with the connector holes in the adjacent unit.The system utilizes a novel removable connector also disclosed herein, an elongated headed pin having at its opposite a pair of parallel chordal slots adapted to receive both a serrated locking plate and a tapered wedge. The locking plate is disposed next to the wood and the wedge is tapped into locking position on the plate by motion parallel to the surface of the wood. It can not be unlocked by motion in the opposite direction, but can be removed simply by prying up on the end spaced away from the pin hole.