Foundation and Footing Digs in Los Angeles

Digging to the engineer’s drawings

Footing depth and width come from the structural plans and, where there is one, the soils report. We do not size footings; we dig what the drawings show. Before layout, we check the footing schedule against the foundation plan, so a thickened edge, a grade beam or an isolated pad under a post is not missed. Trench lines are laid out from the surveyor’s or builder’s reference points, and the bottoms are cut flat and level to the depth shown, with clean sides so the concrete takes the width the engineer designed.

Over-excavation and recompaction

Some soils reports call for the ground under a new foundation to be dug out below footing depth and put back as compacted fill. It comes up where the upper soil is loose, where an earlier owner placed uncompacted fill, or where conditions change across the lot. The report sets how deep and how far beyond the footprint the removal goes. We dig to that line, the soils engineer observes the exposed bottom, and fill returns in compacted lifts to the density the report specifies. If the engineer finds something unexpected at the bottom, such as softer ground or buried debris, the depth can change on the spot, so the written scope says how that extra digging is handled.

When the dig is next to a neighbor’s house

On many Los Angeles lots a new foundation lands a few feet from the property line and the house next door. California law requires reasonable notice to the adjoining owner before excavating, and if the dig goes deeper than the neighbor’s foundation, advance written notice is required so they have time to protect their structure. We handle that as part of permitting. Santa Monica will not issue the permit without proof the notice was given. Along a shared line, we plan the sequence so footings stay open as briefly as practical, and where the plans call for shoring or slot cuts, the dig follows that order exactly.

Permits, inspection and the spoil pile

Inside the City of Los Angeles, footing excavation covered by a valid building permit is generally exempt from a separate grading permit on flat lots. Hillside lots are treated differently; see our hillside grading page. Footing excavations are inspected before concrete, so the bottoms have to stay clean until then. Excavated material either goes back later as backfill or leaves the site, and on a tight lot we decide where it sits so it does not load the edge of an open trench. For backyard units, the ADU pad page covers access and the sewer tie-in.

What sets the schedule? The footing layout on the plans, the soil, whether over-excavation and recompaction are required, and when the inspection can be booked.

Frequently asked questions