Permit path in Lafayette
City zoning plan check
The City of Lafayette Planning Department reviews first.
County plan review
Lafayette contracts with the County Building Inspection Department for plan check.
County inspections
Footing, reinforcement, drainage and final inspections.
Because County staff handle Lafayette’s building review, ask at the zoning check which wall-height threshold applies; the County’s own exemption for unincorporated areas ends at 3 feet measured from the top of the footing (County rules). Any surcharge (a driveway, house or slope above) means a permit and engineering. Full comparison: permits by city.
Grading: 50 cubic yards
The County’s grading thresholds drop from 200 to 50 cubic yards of excavation or fill in Lafayette, Moraga and Orinda (Contra Costa County). A long hillside wall with a deep cut can reach that quickly once over-excavation for drain rock and geogrid is counted.
Planning a wall on a Lafayette slope? Talk it through with a local contractor.
Protected trees near the wall
Lafayette’s tree ordinance, in effect since January 2025, protects indigenous oaks, bays, buckeyes and madrones with trunks 12 inches or more in diameter on developed property, native riparian species from 6 inches, and native trees of any size in restricted ridgeline areas; removing or excessively pruning one needs a permit (Lafayette ordinance). Wall footings dug near big oaks deserve an arborist’s input before excavation.
Walls that suit Lafayette lots
Terraced segmental block walls and board-formed concrete fit the steeper lots off the hillside roads; stone and boulder walls suit older ranch-style properties where equipment can reach. Compare options in hillside and tiered walls, and price them with the cost guide.
Lafayette questions
Do I need a permit for a retaining wall in Lafayette?
Start with the City of Lafayette’s zoning plan check; the County Building Inspection Department then handles plan check and inspections. Ask at the zoning check which height threshold applies to your wall. Any wall holding up a driveway, building or slope should be expected to need engineering.
Can I remove an oak to build a wall in Lafayette?
Lafayette’s tree protection ordinance (effective January 2025) protects indigenous oaks, bays, buckeyes and madrones 12 inches or more in diameter on developed lots, and native riparian trees from 6 inches. Removing or excessively pruning one needs a tree permit.
Sources
- City of Lafayette: Building permits
- Contra Costa County: Retaining walls (PDF)
- Contra Costa County: Grading permits
- Lafayette tree protection ordinance (2025)
Checked October 2026. Rules and prices change; confirm with the agency or a contractor before you build.