Solana Beach Retaining Walls on Coastal and Bluff-Top Lots, Plus Del Mar

Last Updated: October 27, 2026

Almost every retaining wall in Solana Beach is a coastal project before it is anything else: about 99% of a grid sample of the city falls inside the California Coastal Zone. Batterline San Diego Retaining Walls offers and manages garden, terrace and hillside retaining walls here, along with drainage fixes and repairs, with building permits through the City of Solana Beach’s Community Development department and coastal permits where they apply.

Bluff-top rules in the certified Land Use Plan

Solana Beach writes its own bluff rules into its certified Land Use Plan, as modified by the California Coastal Commission. New bluff-top development has to sit landward of a Geologic Setback Line of at least 40 feet, so that no retention device is ever needed to protect it; cantilevers can reach up to 10 feet past that line with every footing landward. Upper-bluff retention systems are approved only on specific findings and last only as long as the structure they protect needs them. Their permits expire after 20 years and are reassessed, mitigation for sand supply and public access is assessed in 20-year increments with a Coastal Development Permit amendment before each period ends, and monitoring reports are due every five years.

The scale of existing armoring shows why. In its 2013 findings, the Coastal Commission counted 53 bluff-top single-family homes in Solana Beach, all north of Fletcher Cove. About 35 had a lower seawall, about 15 of those also had mid or upper bluff armoring, and about 16 had only seacave or notch infill or natural bluff. Upper-bluff retention devices are engineered coastal structures, and shoring, soldier piles and tiebacks are not services Batterline offers. On these lots the walls in scope are the garden and terrace walls landward of the setback, and the coastal bluff walls guide explains how bluff permits differ from ordinary wall permits.

Sandy soils and where the water goes

Solana Beach soils are mostly sand, not clay. A USDA soil survey sample puts moderate or higher shrink-swell at just 3% of points, with Marina loamy coarse sand and Corralitos loamy sand among the common units, alongside a severely eroded loamy alluvial land-Huerhuero complex on 9 to 50 percent slopes. A third of points sit on slopes of 15% or more. Sand doesn’t swell against a wall, but it erodes, so the questions are how water leaves the lot and where the wall’s drains discharge. A drain outlet that empties toward a bluff or down an unprotected slope moves the problem rather than solving it. Most homes are older, with 69% built before 1980 (Census ACS), and a wall’s drains are worth checking before its face. On a steeper lot the wall becomes a hillside wall in poured concrete or block, engineered for that slope.

Del Mar, its own city and permit office

Del Mar

Del Mar is a separate city with its own permit office, the City of Del Mar Planning and Community Development. Its zoning and coastal rules for walls near bluffs, slopes and canyons are its own, and how they apply to a wall is confirmed with the City for each address before design. About 99% of a grid sample of Del Mar lies in the Coastal Zone, 21% of a sample falls on mapped slopes over 25%, and its soils are sandy, mostly Marina loamy coarse sand on 2 to 30 percent slopes. Homes skew older, with 75% built before 1980 (Census ACS). The permit guide explains why each city’s rules are confirmed separately, and the cost guide gives typical San Diego-area wall ranges.