Kit of parts for modular building

A kit of parts suitable for assembly into a modular building unit comprises at least one floor or other platform. The kit comprise a plurality of support legs which comprise a foot or pad 2 from which an elongate coupling member 3 extends having seating means 4 and a plurality of resilient tensile connecting members 5 adapted to receive the coupling members. A plurality of elongate floor or platform support beams 9 are adapted to receive the coupling members and engage the seating means 4. The floor or platform support beams are adapted to receive and retain an edge of a floor or platform panel 7. The tensile connecting members may be in the form of a tape or band of polyvinylchloride or polypropylene and have holes through which the coupling members pass. The kit may also include posts for supporting wall panels. Also disclosed s a kit for forming a roofing structure or other building covering.