Rough grading certification is the formal statement by the civil engineer and geotechnical engineer that the earthwork on a site has been completed in substantial conformance with the approved grading plans and geotechnical recommendations. It is the gateway between site grading and building construction. Without rough grading certification, the building department will not issue foundation permits, and vertical construction cannot begin. Understanding what the certification requires and what delays it helps keep projects on schedule.

What Rough Grading Certification Means

The certification is typically a letter (or set of letters) from the project engineers stating:

• From the civil engineer: The rough grading has been completed in substantial conformance with the approved grading plans. Pad elevations, slope ratios, drainage infrastructure, and site geometry match the plans within acceptable tolerances.
• From the geotechnical engineer: All fill placement and compaction has been performed under their observation and testing. The fill meets the compaction and moisture content requirements specified in the geotechnical report. The subgrade is suitable for the proposed foundations, pavements, and other improvements.

These letters are submitted to the building department and/or public works department. The jurisdiction reviews the letters, confirms that the certifications address the grading permit conditions, and then releases the hold on the next phase of permits.

Who Signs What

Prerequisites for Certification

Before the civil engineer and geotechnical engineer can issue their certification letters, the following must be complete:

1. All earthwork complete. All cuts, fills, building pads, slopes, and retaining walls must be at final rough grade elevation. No additional significant earthwork should remain.
2. All compaction testing passed. Every lift of fill must have passing compaction test results. Any previously failing tests must have been corrected and retested.
3. Subdrain and drainage infrastructure installed. Behind retaining walls, under fill slopes, and at the base of keyways, the subdrains specified in the geotechnical report must be in place.
4. Erosion control in place. Slopes must be protected (hydroseeded, covered with erosion blankets, or otherwise stabilized) per the SWPPP or erosion control plan.
5. Survey of as-graded conditions. A licensed surveyor must shoot the as-graded pad elevations, slope tops and toes, and drainage infrastructure inverts. The civil engineer uses this survey to prepare the as-graded plan and verify conformance with the design.

The As-Graded Plan

The as-graded plan (also called the as-built grading plan or record of survey) shows the actual constructed conditions compared to the approved design. It typically includes:

• As-graded pad elevations at building corners and at a grid across the pad.
• As-graded top-of-slope and toe-of-slope elevations.
• Slope ratios as constructed (measured, not assumed from the plan).
• Drainage structure inverts (catch basins, area drains, V-ditches).
• Retaining wall top and bottom elevations.
• Comparison to the approved plan elevations, with notes on any deviations.

Acceptable tolerances for as-graded elevations are typically plus or minus 0.1 foot (1.2 inches) for pad elevations and plus or minus 0.2 foot for slope elevations. Larger deviations require evaluation by the civil engineer and possibly a revised drainage analysis to confirm that the drainage patterns still function correctly.

Timeline

The rough grading certification process typically takes 2-4 weeks after earthwork is physically complete:

Common Reasons Certification Is Delayed

• Missing compaction test results. If the geotechnical firm does not have continuous test coverage for every lift of fill, they cannot certify. Gaps in testing (contractor placed fill without calling the testing firm) require remediation: the fill must be removed and replaced with testing, or the geotechnical engineer must perform additional investigation (test pits, in-situ testing) to verify the compaction of the untested fill.
• Pad elevations are wrong. If the as-graded survey shows pad elevations that differ from the approved plans by more than the tolerance, the civil engineer must evaluate the impact on drainage, building design, and ADA compliance. If the deviation is significant, a revised grading plan may be required.
• Slopes are too steep. If the constructed slope ratios are steeper than the approved plan (e.g., 1.8:1 instead of 2:1), the geotechnical engineer may need to evaluate slope stability and may not certify without remediation.
• Drainage does not flow correctly. If the as-graded survey shows ponding areas or reverse grades that were not in the design, the civil engineer cannot certify that the drainage conforms to the plans. The contractor must regrade the affected areas.
• Erosion control is not installed. Many jurisdictions will not accept rough grading certification until erosion control measures are in place on all exposed slopes and disturbed areas.

After Certification

Once rough grading certification is accepted by the jurisdiction:

• Foundation permits can be issued (if not already included in the building permit).
• Vertical construction can begin.
• The grading permit remains open for final grading (fine grading around the building, final drainage connections, landscaping), which is certified separately after building construction is complete.

The rough grading certification is not the end of the civil engineer's involvement. Fine grading, utility connections, pavement, and final drainage all occur after the building is constructed, and a final grading certification is required to close out the grading permit.