Grading and drainage
Solana Beach's 50 cubic yard grading cap rules out some sloped sites, so we check it first. From the Solana Beach ADU Submittal Process and Basic Plan Requirements (June 2025).
How grading is counted
| Table | Includes |
|---|---|
| ADU (max 50 CY) | Cut outside the structure; fill; aggregate |
| ADU exempt | Cut under the structure; footing excavation; removal and recompaction |
| Non-ADU scope | Other grading; the worksheet flags a DRP if aggregate exceeds 100 CY |
Engineering items
- Topographic plan by a civil engineer or land surveyor, 2 ft contours, USGS sea level datum
- Drainage study may be required for ADUs outside the existing footprint; detention, hydrology or soils reports possible
- Roof drains flow to landscaped areas before reaching the street
- Storm water category checklist and SWQMP
- Construction BMPs shown on the site plan
Sources, checked Oct 14, 2026: Solana Beach ADU Submittal Process and Basic Plan Requirements (June 2025).
FAQ
What is the grading limit for an ADU?
ADUs are not permitted where more than 50 cubic yards of grading is required to create the ADU.
What grading is exempt?
The worksheet lists cut under the structure, footing excavation and removal/recompaction as exempt.
Is a drainage study required?
For new ADUs outside the existing footprint, a drainage study by a registered civil engineer may be required.