Grading & Drainage Site Plans for California Properties

Coordinated With the Rest of the Project

Grading and drainage often become relevant because of another construction project. Here is how we approach the connection.

Exempt Doesn't Mean No Requirements Apply

Grading permits are generally associated with earth movement, but the exact thresholds and exemptions are established locally. A relatively small residential project may be exempt from a formal grading permit in one jurisdiction while still needing to comply with grading, slope, drainage, erosion, or building-code requirements.

This is why a property owner should not treat "permit exempt" as meaning "no technical requirements apply." The site conditions and local ordinance still matter.

Documenting Design, Not Inventing It

Drainage arrows on a drawing can look simple, but they imply how water is intended to move. That makes it important not to invent drainage design without appropriate information — a site plan can document slopes and drainage features provided by the project team, survey, engineer, or reliable field information.

More complicated drainage systems may require calculations, hydrology, stormwater design, or civil engineering. The California State Water Resources Control Board also regulates stormwater from certain construction activity at the state level — larger or qualifying projects may need separate stormwater compliance beyond the local grading plan.

A Reliable Plan Depends on Reliable Elevation Data

Topographic surveys can provide ground elevations, contours, structures, and other site data that are difficult to establish accurately from aerial images or basic parcel records. General drafting can organize topographic information but does not create a professional topographic survey unless that work is performed by an appropriately licensed professional.

If a project is located on a hillside, near retaining walls, or in an area where small elevation differences affect drainage, obtaining proper survey and engineering information early can prevent repeated redesign.

Grading Information Shouldn't Exist in Isolation

Finished-floor elevations, driveway slopes, retaining walls, pool elevations, building pads, and drainage paths can affect multiple sheets. If one drawing shows a building at a different elevation from another, the permit reviewer may request clarification before the project can proceed.

What You Can Expect From the Drafting Scope

A typical drafting scope may include a grading and drainage site plan, existing and proposed elevations supplied by the project team, drainage arrows, retaining or hardscape relationships, limits of work, notes, and PDF/CAD deliverables.

Civil engineering, hydrology, stormwater calculations, geotechnical analysis, professional topographic surveying, retaining-wall structural design, and stamped grading plans are separate where required. We can coordinate with those professionals and draft from their approved design information.