Locating and exploratory excavation will certainly not be free of charge, possibly within the framework of a building permit procedure, but then you should already own the property...
Sorry if I have to disagree here: locating is indeed free of charge if the plans from the utility providers/operators are not accurate enough to continue planning based on today's standards.
You have to understand where the problem lies. For example, if a gas pipeline was laid 30 years ago and there was only farmland visible five kilometers left and right of the pipeline, it is logical that it was only measured and documented precisely enough to find the pipeline again in an emergency. Whether, in the event of a repair, a row of grain falls more or less on the left or right is/was irrelevant.
If the area is replanned with development 30 years later, this level of accuracy is usually no longer sufficient. The utility providers have their own measurement teams who re-measure the lines in such cases/areas and then make these data available to the planners. Of course also out of their own interest (!).
This takes time – but is available free of charge, experienced that several times myself.
A quick alternative is to plan, for example, one meter additional distance on top of the required width of the protection corridor if there is space available.
Kind regards
Dirk Grafe