LA Grading Permit 50 Cubic Yards Threshold (2026)
A grading permit is required for any excavation or fill over 50 cubic yards under LAMC §91.7006 and CBC Chapter 18. On hillside-suffixed lots the threshold drops to 20 cubic yards, and any project exporting more than 1,000 cubic yards of soil triggers a LADOT haul-route approval adding 4–12 weeks to the schedule. This guide walks the thresholds, the geotechnical report chain, the 2026 LADBS fee schedule, the NPDES storm-water overlay, the CEQA exemption framework for ministerial projects, and the six site-specific variables (soil type, access, export distance, tipping fees, shoring, dewatering) that drive grading cost more than any other factor.
The 50 cubic yards trigger — what LAMC §91.7006 requires
LAMC §91.7006.1 requires a grading permit for any excavation, fill, or combined excavation-and-fill exceeding 50 cubic yards on a parcel.
Separate trigger: any grading within 15 feet of a property line regardless of quantity, any grading that changes drainage patterns onto adjacent property, any grading on a hillside-suffixed parcel over 20 cubic yards.
50 cubic yards is roughly a 20-by-20-foot excavation 3.5 feet deep — about the size of a pool shell or a two-car-garage foundation. Most pool builds, ADU foundations, and whole-house additions cross the threshold.
Under-threshold grading (landscape terracing, small patio, minor driveway work) does not require a grading permit but still must follow LAMC §65.02 drainage requirements.
The hillside threshold — tighter rules
For hillside-suffixed parcels (R1-H, RE-H, RA-H) under the Baseline Hillside Ordinance (LAMC §12.21-C.10), the grading threshold drops to 20 cubic yards.
Hillside grading also has maximum export and import limits tied to lot area under LAMC §12.21-C.10.h.2: typically 1,500 cubic yards export maximum on lots under 20,000 sqft, 2,500 cubic yards on lots 20,000–40,000 sqft, and case-by-case for larger parcels.
Slope limits: finished cut or fill slopes cannot exceed 2:1 (horizontal to vertical) without engineered design. Engineered design requires a California-licensed geotechnical engineer and civil engineer of record.
Hillside parcels in the Very High Fire Hazard Severity Zone also need to meet CBC Chapter 7A perimeter and defensible-space integration during grading design.
Geotechnical report — the CBC Chapter 18 requirement
CBC §1803.2 requires a geotechnical (soils) investigation for any structure or grading project that will impose significant loads or cross potentially unstable soil.
LADBS requires the geotechnical report to be stamped by a California-licensed Geotechnical Engineer under Business & Professions Code §6735. The report covers slope stability, soil bearing capacity, foundation recommendations, drainage, seismic amplification, liquefaction potential (in CGS mapped zones), and expansive soil mitigation.
Cost: $5,000–$15,000 for a typical single-family lot, higher on hillside parcels with known landslide flags, fault proximity (Alquist-Priolo zones), or prior failure history. Report turnaround 4–8 weeks from field work to issuance.
LADBS will not accept grading plans without an accepted geotechnical report. If the report identifies mitigation (friction piles, tieback walls, drainage modifications), those become mandatory design elements.
Haul route — the 1,000 cubic yards trigger
LAMC §62.05 requires a haul route approval from LADOT for any grading project exporting or importing more than 1,000 cubic yards of material.
The haul route identifies streets for truck travel, restricted hours (typically 9 AM to 3 PM to avoid rush hour on major arterials), truck count per day, and turning-radius compatibility.
Haul route approval takes 4–12 weeks including LADOT review, neighborhood council notice under CD rules, and sometimes a public hearing for large projects.
Typical LA hillside grading for a larger custom home or a pool with significant cut exports 1,500–4,000 cubic yards. A typical 10-cubic-yard dump truck makes 150–400 trips, running $150–$280 per load plus tipping fees at the landfill or clean-fill receiving site.
Fees and timelines — the 2026 LADBS numbers
LADBS grading permit fees scale with cubic yards under LAMC §91.7001 Table 7-A. Base fee at 50 cubic yards starts at about $420 in 2026. 500 cubic yards runs $1,850. 5,000 cubic yards runs $6,200.
Plan-check fee is separate, typically 65% of the permit fee. So a 1,000-cubic-yard project might see $2,800 permit + $1,820 plan check.
Timeline: small grading with no geotechnical issues plan-checks in 4–8 weeks. Hillside grading with geotechnical review and haul route runs 12–24 weeks. Fault-zone or landslide-adjacent grading can exceed 6 months.
Inspections: multiple stages — excavation inspection, setback verification, compaction testing (every 2 feet of fill lift typically), final grade inspection. Compaction testing must be done by a California-licensed materials testing lab and reports filed with LADBS before vertical construction starts.
The six cost variables — what actually drives grading price
Soil type: expansive clay (common in the Valley floors) adds lime-stabilization cost. Decomposed granite (common in hills) is fast to cut but compacts poorly. Rock excavation typically adds $45–$120 per cubic yard over standard earth.
Access: tight sites in Silver Lake, Hollywood Hills, and similar neighborhoods require smaller trucks and slower cycles, adding 30–60% to haul cost.
Export distance: the nearest clean-fill site or landfill that accepts the material determines round-trip time. Distance from Hollywood Hills to Sun Valley Recycling (typical receiving site) is 40 minutes each way.
Tipping fees: $12–$28 per cubic yard in 2026, higher for contaminated soil that requires Class II or hazardous-waste landfill.
Shoring: required for excavations over 4 feet under Cal/OSHA CCR Title 8 §1540 or for setbacks less than 1:1 from structures or property lines. Adds $8,000–$45,000.
Dewatering: seasonally high water tables near the LA River or in coastal lowlands (Venice, Marina del Rey) add dewatering pumps and sediment-basin costs.
Grading for pools, ADUs, and additions — common project scopes
Pool excavation typically exports 80–180 cubic yards for a 15 x 30 pool depending on depth. Most LA pool projects cross the 50-cubic-yard threshold and pull a grading permit alongside the pool permit.
ADU foundation grading: 40–120 cubic yards for a typical 600–1,000-sqft detached ADU. Flat-lot ADUs often stay under threshold if the footprint is small. Hillside ADUs almost always trigger a grading permit under the 20-cubic-yard hillside threshold.
Whole-house additions: foundation footings, utility trenching, and site leveling typically generate 60–220 cubic yards depending on addition size and existing grade. Most cross the threshold.
Basement construction: the largest grading scopes in residential LA. A 800-sqft basement excavates 350–550 cubic yards plus shoring. Schedule 16–28 weeks of grading-plus-foundation work, with heavy coordination between geotech, structural engineer, and civil engineer.
Major landscape grading for terracing, drainage swales, or pool deck leveling: these often run 100–400 cubic yards and need their own grading permit separate from any structural permit.
CEQA and environmental review for larger grading projects
Ministerial projects (most SB 9 and ADU grading) are exempt from CEQA under Public Resources Code §21080. Discretionary projects (zone changes, variances, specific-plan amendments) trigger CEQA review.
Categorical exemptions under CEQA Guidelines §15300 cover most single-family home grading. Exemption Class 3 covers new small structures and minor alterations; Class 4 covers minor alterations to land.
When CEQA applies, typical document levels: Categorical Exemption (shortest path, essentially a memo), Mitigated Negative Declaration (MND), or full Environmental Impact Report (EIR). Single-family-scale grading almost never triggers EIR.
Cumulative impact: neighborhoods with multiple concurrent grading projects (especially in post-fire rebuild zones) can see combined impact analysis on traffic, air quality, and drainage. The Palisades and Eaton fire rebuilds generated a CEQA programmatic EIR in 2025 that covers most standard rebuild scopes.
Archaeological and tribal consultation for larger sites
Gov Code §7050.5 and Public Resources Code §5097 require halting work and notifying LA County Coroner and the Native American Heritage Commission if human remains or cultural artifacts are discovered during grading.
Larger grading projects (typically 5,000+ cubic yards or specific sensitive locations) may trigger AB 52 (effective 2014) tribal consultation requirements under Public Resources Code §21080.3.1.
LA County maintains a Sensitivity Map of historic and prehistoric resource areas. Properties in sensitive locations (Chumash and Tongva village sites, Spanish and Mexican-era ranchos, early LA settlement zones) face additional review.
Chance-find protocol in grading specifications: stop-work trigger, qualified archaeologist within 24 hours, tribal monitor if Native American cultural material, LADBS notification, and scope adjustment if significant resources are found.
Storm water pollution prevention — the NPDES overlay
Grading projects that disturb 1 acre or more trigger the California General Construction Stormwater Permit under the National Pollutant Discharge Elimination System (NPDES).
Smaller projects still must comply with LA Bureau of Sanitation SUSMP (Standard Urban Stormwater Mitigation Plan) requirements under LAMC §64.72 when grading exceeds 500 cubic yards.
Best management practices (BMPs) during active grading: straw wattles around the downslope perimeter, silt fence, stabilized construction entrance with 6-inch crushed rock, and dust control via water truck or polymer application twice daily.
Post-grading stabilization: temporary seeding or hydromulch on exposed soil within 14 days of grading completion. Permanent landscape stabilization required within 90 days.
Inspection: LA Bureau of Sanitation inspectors visit active grading sites on a cycle. Violations incur fines of $1,000–$5,000 per day under LAMC §64.72.
Post-fire grading considerations in the burn scar
Post-January 2025 fire parcels require coordination between LADBS, LA County Public Works (Watershed Management Division), and Cal Fire before significant grading.
Debris flow hazard persists 2–5 years post-burn as hydrophobic soil repels water. Grading plans need to show diversion of upslope runoff, sediment basins proportioned to the USGS debris-flow probability model, and outlet structures designed for post-fire peak flow.
USGS post-fire hazard models for the Palisades and Eaton watersheds were published March 2025 and updated November 2025 as soil permeability began recovering.
For whole-house foundations and hillside construction that depends on grading coordination, see the hillside-construction pillar: https://askbaily.com/hillside-construction-los-angeles
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