Parcel Maps in Walnut Creek, CA

Walnut Creek's postwar ranch tracts were platted generously — wide, deep lots that in many cases carry twice the area today's zoning requires. That makes this one of the more genuinely promising East Bay cities for lot splits, and the deep-lot geometry often points to a flag lot: a new rear parcel served by a narrow access strip out to the street. Whether that works is a feasibility question we answer first — minimum lot size and frontage under the applicable zoning, the City's standards for flag-lot access strips and driveway width, and any creek-corridor setbacks, since Walnut Creek's namesake creeks and their tributaries thread through the tracts and structure setbacks from top of bank can consume the buildable area a split depends on. Toward the city's hillier edges, slope and access grades enter the analysis the way they do everywhere in the hills.

The process runs under the Subdivision Map Act: divisions of four or fewer lots proceed by tentative parcel map to the City, approval with conditions, then a final parcel map examined and recorded with the Contra Costa County Recorder. SB 9 adds a ministerial alternative on qualifying single-family parcels, and on Walnut Creek's roomy ranch lots the statutory minimums are met more often than in the inner East Bay — though the City's objective standards govern the details. For downtown sites near the Broadway Plaza retail core, land division questions usually arrive attached to condominium projects instead, where the map is a condominium conversion or new condo map rather than a simple split.

Our Trimble terrestrial laser scanner captures a deep ranch lot — house, accessory structures, mature trees, creek bank, and grades — in one mobilization. The resulting point cloud serves as the tentative map's topographic base and resolves the practical questions early: where the access strip fits, how the driveway grades, and exactly how much buildable area survives the creek setback.