Whether or not you need a permit to build a pole barn will depend on your location and the laws in your area.
In some cities and towns and counties you need a permit to build a pole barn and some places you do not need a permit to build the pole barn.
In my county and town we do not need permits to build anything including a pole barn.
I built my pole barn myself without getting a permit and never got into trouble for doing so as my area does not require permits.
I checked first to be sure though.
if you do need a permit to build the pole barn it's pretty easy to get.
If you live in a small town then you likely do not need a building permit to build the pole barn and if you live rural such as out in the woods you do not need a permit for the pole barn.
If you hire a pole barn builder then they will usually get the permit whether it's needed or not because of their business and licensing issues.
Building a pole barn on your property will increase your property taxes by at least 5 to 10 percent.
When I built my pole barn it raised my property taxes another $400.00 per year which was okay with me as I needed and wanted the pole barn.