The question is not what the wall costs. It is whether the City or the County will let you build it without a building permit. City of San Diego Information Bulletin 220 (October 2024) and San Diego County Planning & Development Services form PDS 083 both draw the line at 3 feet, measured from the top of the footing to the top of the wall. A wall that looks 2.5 feet above grade can still need a permit once the buried footing is counted. Bloom Pro SD does not pull permits. We match you with a licensed hardscape contractor, and you hire that company directly.
This page is the permit question. For dollars per face-foot, use retaining wall cost on San Diego slopes. For block vs wood vs concrete, use retaining wall materials.
City of San Diego: when IB 220 requires a permit
Inside City of San Diego jurisdiction, a retaining wall needs a building permit when any of these is true (IB 220):
- Height exceeds 3 feet, measured from the top of the footing to the highest point on the wall.
- The wall supports backfill steeper than 1.5 horizontal to 1 vertical.
- The wall supports a surcharge: driveways, walkways, structure footings, fences, and similar extra load.
- The wall impounds flammable liquids.
- Tiered walls whose total height, from the bottom-tier wall’s top-of-footing to the top of the highest tier, is greater than 6 feet, or a tier footing that crosses the lower wall’s slope-stability plane. The bulletin treats that plane as 2 horizontal to 1 vertical up from the bottom edge of each footing’s heel.
A wall under 3 feet is not automatically exempt. Surcharge, steep backfill, or a flammable-liquid condition still triggers a permit. Those same conditions also cannot use the City’s standard retaining-wall drawings in Information Bulletin 221. They need a custom engineered design.
Plans go in electronically through the City portal as a Building Permit. IB 220 says Rapid Review is available when you use that bulletin’s standard path. Fees are collected per Information Bulletin 501: submittal fees before review, inspection fees at issuance. This page does not invent a dollar amount for those fees.
Unincorporated county: PDS 083
On an unincorporated San Diego County lot, PDS 083 (retaining walls with sloping backfill) says construction of retaining walls requires a permit except those less than 3 feet in height and not supporting surcharge. Wall height is measured from the top of the footing to the top of the wall. Companion form PDS 084 covers level backfill. No building foundation, driveway, parking, or other loading is allowed on the upper level within a distance equal to the wall height unless a California licensed architect, civil engineer, or structural engineer designs it. Footing mix on that form is a minimum 2,500 psi.
That is the County’s rule, not a countywide copy of every city. Encinitas, Chula Vista, El Cajon, and the rest run their own counters. Ask the office that issues permits for the parcel.
What this is not
Do not treat a 4-foot “from the bottom of the footing” rumor as City or County law. City IB 220 and County PDS 083 both use 3 feet from the top of the footing. Pacific Beach Builder’s “over 4 feet” line and similar blog shortcuts are not the City bulletin.
An uncovered patio slab is also not this page. Patio covers (shade structures) are City Information Bulletin 206, a different permit family. See our poured concrete patio cost guide for that split.
What the contractor should put in writing
A usable retaining-wall proposal names:
- The jurisdiction (City of San Diego vs a named other city vs unincorporated county)
- Measured height from top of footing, not only the visible face
- Whether anything sits above the wall that counts as surcharge
- Who prepares plans, who submits them, and who pays permit and inspection fees
- Drainage: pipe, gravel, and where water leaves the property
Bloom Pro SD does not inspect the slope, stamp drawings, or talk to DSD for you. The independent contractor you hire does that work, or tells you they will not.
How we fit
Hardscaping is in scope. If the wall is holding a hillside, sitting under a driveway, or sitting near a property line, call (760) 400-6355 and we will match you with a licensed local pro who quotes after they see the site.