A framework module for use in modular building construction comprises a plurality of elongate upright and cross beams, rigidly connected at or towards their ends to form a box frame with open side and end faces, and; at least one connection point on each of the upright beams which is configured to allow mutual connection with an equivalent connection point located on a substantially identical adjacent framework module, so that a plurality of framework modules can be connected together to form an open-web truss of vertically and horizontally aligned members.