Why the city matters for masonry work
Brick and mortar behave the same in Sandy as they do in Bountiful. The rules around them do not. Permit triggers for retaining walls, the office that issues permits, and historic preservation steps all vary by city.
A few examples. Salt Lake City exempts some retaining walls up to four feet, measured from the bottom of the footing to the top of the wall (SLC permit FAQs). Herriman requires a permit at four feet of unbalanced fill, and for shorter walls carrying a surcharge (Herriman). Kearns and Magna get building permits through the Greater Salt Lake Municipal Services District, not a city building department. Each city page below links to the official office for that city.