Briefing summary
- Hazard rank: the City’s 2023 hazard plan annex rates earthquake as a High significance hazard, with extensive geographic reach and a “Likely” probability rating.
- Housing age: Census estimates put about 69% of Solana Beach housing units before 1980, and about half in the 1970s alone.
- Where the work usually is: the connections between a wood house and its foundation, and, in raised-floor homes, the short crawl-space walls.
- Help available: ZIP 92075 appears on the state’s Earthquake Brace + Bolt list for qualifying older raised-foundation homes.
- Process note: all of Solana Beach is in the Coastal Zone, so even seismic work starts with the City’s planning intake.
Earthquake preparedness tends to slip down the list in a city where the bluffs get most of the attention. It shouldn’t. The same plan that tracks bluff failures ranks shaking as the city’s top-tier hazard, and the housing stock is old enough that some buildings may predate the anchorage and bracing details used today. What follows is written for two readers at once: the owner of a single older house, and the board member who has to think about several buildings.
The fault picture in the City’s own plan
The Solana Beach annex to the County’s 2023 hazard mitigation plan lists the Rose Canyon, La Nacion, Elsinore, San Jacinto, Coronado Bank and San Clemente fault zones as the major active faults in the county. It describes the Rose Canyon fault zone as part of the larger Newport-Inglewood system and calls it the greatest potential threat to the region, including Solana Beach, because of its proximity to population. The Coronado Bank fault lies about 10 miles offshore.
The annex also records the history residents sometimes forget. A strong earthquake on May 27, 1862, damaged buildings in Old Town San Diego, and a magnitude 5.3 earthquake on the Coronado Bank fault on July 13, 1986, was centered about 25 miles west of Solana Beach. The County’s loss estimate for the city uses a Rose Canyon magnitude 6.9 scenario and counts shaking, liquefaction and landslide together. The annex further pairs erosion and landslide with earthquake as a priority concern, a reminder that on a bluff-edge city the two hazards are not separate.
Which Solana Beach houses this is about
The 2024 five-year Census estimates count about 6,600 housing units in Solana Beach. Roughly 3,300 of them were built between 1970 and 1979. Another 840 or so date from the 1950s or earlier. Only about 7% of units were built in 2000 or later.
For seismic planning, three groups stand out:
- Older single-family homes on raised wood floors, with crawl spaces and, in some cases, short cripple walls.
- 1970s single-family and townhome stock on slabs or raised floors, some of it possibly built before today’s anchorage details.
- Condominium buildings, some with parking or open space beneath living units. Our HOA and condo structural repair page covers building-level questions.
Three connections a retrofit looks at
California’s Existing Building Code, Appendix A3, applies to light wood-frame homes and lists the weaknesses a retrofit addresses. Section A303 includes sill plates not anchored to the foundation, unbraced cripple walls, posts on isolated pads, and foundations that are not continuous or are built of unreinforced masonry.
In plain terms, a reviewer is asking three questions:
- Is the house bolted down? Anchor bolts or plates tie the wood sill to the concrete.
- Are short crawl-space walls braced? Cripple walls are usually sheathed with structural panels so they don’t fold.
- Does the foundation itself hold together? Isolated piers or old masonry may need more than hardware.
The California Residential Mitigation Program describes the same work for homeowners as a “brace and bolt” or “bolt-only” retrofit, depending on whether cripple walls are present, and adds strapping of the water heater. Our seismic retrofit page goes further into the vulnerabilities we look for.
When the prescriptive path ends
Appendix A3 offers prescriptive details for common cases. It also sets limits. Section A304 requires cripple walls taller than four feet to be designed by a registered design professional, and conditions such as steep hillside foundations, irregular framing or unusual additions fall outside a simple plan set. In those cases, engineering design is part of the project, not an option. That is where we coordinate with licensed engineers as needed.
The grant program and its fine print
The Earthquake Brace + Bolt program, run by the California Residential Mitigation Program, lists ZIP 92075 among its Southern California ZIP codes. The program applies only to wood-framed, pre-1980 homes on raised foundations. Registration opens for a limited period each year, and qualification is based on the registration questions about the house. Supplemental grants are offered to income-eligible households when funds allow.
Three points owners tend to miss:
- Work must comply with Appendix A3 of the Existing Building Code.
- A contractor must come from the program’s directory, or an owner can act as owner-builder under program rules.
- For larger FEMA-funded supplemental grants in a mapped flood hazard area, the program describes flood insurance requirements that run with the property.
Slab-on-grade homes do not qualify for this program, though they may still benefit from a look at anchorage and connections.
Permits in an all-coastal-zone city
The City’s Building Services page notes that Solana Beach adopted the 2025 California codes, including the Existing Building Code, effective January 1, 2026. It also states that the entire city is in the Coastal Zone and that coastal development permits, waivers and exemptions are reviewed by the California Coastal Commission rather than the City. For a bluff-top property, initial planning review is not approved until the Commission’s approval letter is submitted.
A seismic retrofit is normally interior structural work, but the intake still runs through planning first, and planning staff tell the applicant whether Commission review applies. We do not predict how that review will go; we help owners prepare the scope and drawings it will look at.
Board agenda item: the seismic question
For condominium and townhome associations, seismic work belongs in the building record alongside balconies and drainage. A practical first agenda item:
- Confirm the construction type and year for each building.
- Identify any parking or open space beneath living units.
- Collect existing permits and drawings from the City’s records process.
- Note whether any building has had seismic work, and where it is documented.
- Decide whether a structural evaluation should be scoped this year, and for which buildings first.
Our earlier briefing on how HOA boards can scope a structural evaluation sets out how to frame that request.
What shapes a seismic project’s scope here
- foundation type: raised floor, slab, or a mix after additions
- presence and height of cripple walls
- condition of sill plates, including any salt-air or moisture damage
- continuity of the foundation and any isolated piers
- access to the crawl space
- whether engineering design is required under Appendix A3
- planning intake and any Coastal Commission review steps
Seven points to carry forward
- Earthquake is rated High in the City’s own hazard plan.
- About half of local housing dates from the 1970s.
- Bolting, bracing and foundation continuity are the core questions.
- Tall cripple walls and hillside foundations need engineered design.
- ZIP 92075 is on the Brace + Bolt list for qualifying raised-floor homes.
- Planning intake comes first in a city that is entirely coastal.
- Boards should give seismic its own line in the building file.
We serve all of Solana Beach. To start with a crawl-space look or a building-level review, request a Free Quote.