(1) In accordance with subsection 109.4 of the International Building Code and pursuant to the requirements of fees being commensurate with costs, the department may assess an investigation fee for any work commenced on a building or structure prior to obtaining the required building permits. The investigation fee will be charged on an hourly rate of $75.00 per hour, for every hour, including portions of an hour spent on investigating the work commenced without the proper building permits. This investigation fee shall be in addition to the regular plan review and building permit fee assessed in ARM 24.301.138(1)(a) and (b).