The approach to this issue has a number of nuances. The cost of repairs, which must be done in the bathroom, consists of a miscalculation, materials, work, and many other points. Not a single master will be able to make a miscalculation for money if he did not see the room itself. If you take the process of work, then it can also arise many difficulties that will contribute to a deviation from the general work plan. And those calculations that were previously made will be no longer accurate.
The cost of the material itself can also change in different directions. And the customer can correctly adjust his needs. Depends on the condition of the room itself, which is subject to repair. It is for such reasons that only the approximate cost of work that is necessary for repair can be called.
In order to make a calculation by detailed, it is recommended to hire an estimate that will figure out such matters very quickly, stipulating all the necessary points. There is also a type of calculation, such as an estimated calculator, but it will be correct when the room is new and has the correct shape. This method of calculation will not affect everything.