[quote author="Daedalus" date=1239763820]How tall was the wall you built? I assume in this case the wall will be close to 6' tall, since its purpose is for privacy. A block and concrete wall that tall, stretching 40', would weigh about 12 tons. Per code, it could also be less than 5' from the nearest structure, depending on lot width. It would seem unlikely that any city or county would not require permits/inspections for something like this that simply must be built right.
<a href="http://user.govoutreach.com/anaheim/faq.php?cid=3741">Anaheim requirements.</a></blockquote>
The wall we had built was nominally 6' tall. Or, as the contractor put it, the next block above 6'. The yard slopes some, but the fence is level. So the wall varies from about 6' to 6'6" or so. We back against a street, and a substantial remodel was going on across that street, so I'm sure city inspectors saw our wall going up. They never came over.
You could just stop into the City planning office near city hall and ask. It didn't take long, maybe 5 minutes waiting in line. After that I went to another office (I forget what they call it, plans or architecture) and asked to see the original blueprints of our house. They had them on microfilm and let me look at it. They wouldn't let me make copies of any kind, due to copyright issues.