You need to call, your local town offices. Those matters are governed locally.
The distance from a neighbor's property line that can you build a deck in California varies from community to community. It depends on the specific zoning of the area. In some places it may be as little as 5 feet, while in others the requirement may be 25 feet or more.
When you make deck building plans, you need to consider everything when you make the plans. You should look at how big your property is and how far on your property line you can go in making a deck. Add the dimensions of the deck as well as those of the yard on your plans.
You can plant 3 to 10 feet away from the property line without the permission of your neighbors. Different cities and counties have different rules but generally it is illegal to plant directly on the property line unless your neighbors agree.
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You need to call your local building department.
A storage shed built in San Diego, California must be at least three feet away from the property line. The eaves of the building must be at least two feet away from the property line.
Call your city Building and Planning department.
It depends on the setback requirements in the property's zoning. If it's zoned, the zoning regulations will state how close any part of the building can be to the property.
Depends on the State, County & City codes.
The width of the cut of your mower will answer your question.
deck
It depends on the specific zoning of the parcel. Check with your City Engineer's office.