Iron sheet housing on a 50 x 100 ft plot. iron sheet housing costs in kenya. assuming the cost per m2 for iron sheet housing is kes 6000 per m2 a 50 x 100 ft plot construction will cost as below. design type. 2 rooms with outside sharing toilet and bathrooms. each room is 12m2. total area for 2 rooms 24m2. number of rooms.