That's rather simplistic to say the least. Odds are you will end up with some organic materials in the building that will be susceptible to termite damage.
I would understand for an enclosed garage where you (or a future owner) will likely store stuff.
I am currently building a $8K metal carport - open to the weather on both ends - on a concrete slab and, since it is a structure in Florida, the pest control lobby has their hand out ensuring business for their people, like so many other things in Florida real estate.
We live in the woods, with woodpecker nests in our trees, and we like them - we don't apply pesticides to the dead trunks they eat for food, we do have the occasional termite swarm in the yard, and we haven't had termite infestations in the 60 year old house for the 10 years we have owned it - although when we had a roof leak there was a recurring problem with carpenter ants for many years after... Vapor barriers and soil treatment weren't a thing in the early 1960s when this place was built.
Even if we and our neighbors all blasted our yards and homes with pesticides every year, the creek 100 yards away and the acres of undeveloped unmaintained forest on the other side of it would still swarm termites into our yard and onto our house.
Better to monitor for and promptly remedy "conditions conducive to infestation" than to bathe yourself and your children in preventative application of poisons, IMO.
But, like OP, I just need to pass permit inspection - so chucking $200 at a pest control company is the easiest way out of that.