Here is a good resource on easements from the Ombudsman’s office. https://propertyrights.utah.gov/find-the-law/legal-topics/easements/
It is important to remember that an easement does not give “fee simple” ownership or rights to the service providers using the easement. There needs to be a balance between allowing a property owner to use their property (in the easement) and the utility being protected and accessible for the utility company. Often, a case by case analysis is appropriate as opposed to blanket restrictions. A new easement granted to a utility provider can identify specific concerns related to that specific easement.

That would seem to depend on what the easement is for. If there are underground utilities, walls can be a problem. Above ground, the companies involved likely have clearance standards to check on. Where you have sloped properties and “it is just our tradition” to place a PUI around every lot- I’d say it is up to you but check with engineering first.

-John Janson