City concrete by the numbers
Your Lot, Your Rules — the Sidewalk and Curb Are the City’s
On your own lot, a driveway, walk or patio slab 30 inches or less above grade needs no City building permit (SDMC §129.0203). The moment the work crosses the property line — a new or wider apron, a curb cut, a replaced sidewalk panel — it is public right-of-way, and “all improvements in the Right-of-Way require review and approval” (Information Bulletin 165).
The City also puts the sidewalk out front on you: normal wear, age and damage from your own trees are the owner’s to repair, and a Right-of-Way permit is required for every sidewalk repair. Get the driveway’s geometry right while you’re at it — at least 20 feet long from the back of the sidewalk, 12 to 25 feet wide on a lot over 50 feet, and never steeper than 20%.