If any part of your walk sits in the City's right of way, the public land along the street, it needs an encroachment permit from the City's Public Works Engineering Division before we dig. The City has every applicant hire a licensed land surveyor first to pin down what kind of work it is, so build that into your timeline early. The City's permit applications page is where that starts.
The City's Building Division issues building permits for construction work, so that's the other office we check with. When it's unclear what applies to your job, we ask the City instead of guessing, then work out which office it goes through and help you file before work starts. The City's application also has you agree to call 811 before digging, so buried lines get marked first.
We're based in South Lake Tahoe and work in the cities around it. A lot of the walks we pour here run from driveway to front door, and the crossing is where a thin walk breaks first. Pervious concrete lets water soak through, but Tahoe project guidance says it needs fairly frequent upkeep, suits a limited set of low-traffic sites, can be damaged by snowplows and may cost more, though less drainage work can offset that.