The cost of a Melbourne regrouting job is estimated to be an average of $100 to $200. The total size of the bathroom will determine whether it requires more of the grout or even the amount of effort to make the tile look as desired. The kilogram grout bag has a low price of $1.50 to $22. Some factors that can influence the cost of regrouting include the type of grout, the labour charge, the area size to be covered, and the condition of the current grout.