Concord, CA Building Setbacks & Zoning: Setback Rules (2026)

Corner lots in Concord are subject to special setback and visibility rules under CMC Title 18. Because a corner lot fronts two streets, it has a primary front yard (typically based on address orientation or the narrower street frontage) with a standard 20-foot setback, and a street side yard on the secondary street with a reduced 10-foot setback. Both street-facing yards are treated more like front yards for design purposes - fences in these yards are typically limited to 3.5 feet in height within the front setback and the street side setback, rather than the 6-foot limit allowed in interior side yards. A vision clearance triangle (sight distance triangle) is required at all corner-lot intersections: generally a 25-foot triangle measured along both property lines from the corner, within which no fence, wall, hedge, or other visual obstruction over 3 feet tall is allowed. This protects driver and pedestrian visibility. The opposite interior side and rear yards follow standard RS setbacks (5 feet side, 15-20 feet rear). ADUs and accessory structures must respect both the street-side setback and the vision-clearance triangle.