A closely associated water closet (271) and wash basin (231) built as a compact whole and sharing basic inter-fittings thus utilising space and saving water. The wash basin (231) together with the tap (239) being plumbed atop the low level cistern bowl (217) and sharing with the cistern (217), fittings like water hose-pipe (221) inlet tube (258) and waste outlet (241) and excess water outlet (261). T-connections (268) are provided to the inlet tube (258) to facilitate water supply to both the ball valve (256) for filling the cistern (217) and to the tap (239). Waste water from the wash basin (231) empties into the cistern bowl (217) before normal ball valve (256) controlled filling of the latter. The wash basin (231) is installable and de-installable and equally affixable at mid-section or about to a high-level remote coupled water closet.