County restrictions require a permit if the structure exceeds a certain size.
Any permit application will require prior review and approval by the CSD.
There are master restrictions that have setback requirements.
Over a certain height must be set back from the property line.
I'd sketch a proposal with structure dimensions, distance from fence line and height.
I'd take to to Morgan at the CSD to look at.
He can let you know what the rules and requirements are.