ADU Surveys in Benicia, CA

Benicia keeps ADU permitting simple — a code-compliant unit needs only a building permit, no design review, through the city's all-electronic permit portal — but its residential submittal checklist asks for a plot plan with real survey content: lot dimensions given as metes and bounds, the building footprint with every projection dimensioned to the property lines, easements, visible utilities to the curb, and every tree with its species, trunk size, and canopy extent. Two elevation rules follow: lots with more than 5 feet of elevation difference need topography with contours, and hill sites need pad elevations with a ground-slope drainage scheme — with the checklist noting that topography must extend beyond the site boundaries far enough to show anything the project might affect. A soils report sits on the submittal list as an as-applicable item.

Benicia's geography sorts its ADU projects neatly. The historic grid downtown and in the Arsenal — where ADUs must meet special design standards for the Downtown and Arsenal Historic Districts — sits on walkable slopes with 19th-century lot lines that deserve healthy skepticism; Benicia was laid out in 1847, and the fences have had 175 years to wander off the record. The Southampton hills, by contrast, are where the 5-foot-relief contour trigger and hillside pad-elevation rules do their work, and portions of the city fall in mapped flood zones where the city directs builders to its floodplain administrator and FEMA elevation-certificate guidance. Our laser-scanned site survey answers all of it in one visit: boundary resolved from the metes-and-bounds record, trees with trunk sizes and canopies, contours where the lot demands them, and datum-referenced elevations where flood review applies.

Benicia is Solano County, so records run through the Solano County Recorder in Fairfield rather than Martinez. Deliverables are a stamped plot-plan base map, layered DWG, and staked corners; the city's pre-approved ADU program still requires this site-specific work under any standardized plan. See also our Benicia topographic surveys.