Los Angeles sits atop some of the most active fault systems in North America. The city has responded with mandatory seismic retrofit ordinances that require thousands of building owners to strengthen their structures against earthquake damage. These are not voluntary guidelines. They are enforceable mandates with defined timelines, and noncompliance carries serious consequences including fines, restrictions on occupancy, and potential condemnation.

The Two Major Retrofit Ordinances

The City of Los Angeles has enacted two landmark mandatory retrofit ordinances, both signed into law in 2015 under Ordinance Nos. 183893 and 184081.

Soft-Story Wood-Frame Buildings (Ordinance 183893)

This ordinance targets wood-frame residential buildings with three or more stories, or with two or more stories over a ground-floor soft story (typically open parking or commercial space at ground level). These buildings are vulnerable to collapse during strong ground shaking because the open ground floor lacks sufficient lateral bracing.

LADBS identified approximately 13,500 buildings subject to this ordinance. Property owners were notified by the department and given specific compliance deadlines based on a phased timeline.

The compliance timeline for soft-story buildings is structured in phases:

  • Within two years of notification: Submit a structural analysis and retrofit plans to LADBS.
  • Within three and a half years of notification: Obtain a building permit for the retrofit work.
  • Within seven years of notification: Complete all retrofit construction and obtain final inspection sign-off.

Given that notifications began in 2016 and 2017, the final construction completion deadlines for most soft-story buildings have arrived or are imminent. Owners who have not yet complied face escalating enforcement.

Non-Ductile Concrete Buildings (Ordinance 184081)

This ordinance targets concrete buildings constructed before 1976 that lack modern ductile reinforcement. Non-ductile concrete structures are among the most dangerous building types in an earthquake, as they can suffer catastrophic, sudden failure without the warning signs that other structural systems exhibit.

LADBS identified approximately 1,500 buildings in this category. The compliance timeline is longer due to the greater complexity and cost of these retrofits:

  • Within five years of notification: Submit a structural analysis and retrofit plans to LADBS.
  • Within ten years of notification: Obtain a building permit for the retrofit work.
  • Within 25 years of notification: Complete all retrofit construction and obtain final inspection sign-off.

The extended timeline for non-ductile concrete buildings reflects both the engineering complexity and the substantial cost involved, which can reach millions of dollars for large structures.

What the Retrofit Involves

Soft-Story Retrofits

The typical soft-story retrofit involves adding steel moment frames, plywood sheathing, or a combination of bracing systems at the ground-floor level to increase lateral resistance. A licensed structural engineer must design the retrofit in accordance with ASCE 41 (Seismic Evaluation and Retrofit of Existing Buildings) and the specific provisions of the Los Angeles Building Code. The work generally allows the building to remain occupied during construction.

Non-Ductile Concrete Retrofits

Retrofitting non-ductile concrete buildings is significantly more involved. Common approaches include adding concrete or steel shear walls, wrapping columns with fiber-reinforced polymer (FRP), adding external bracing, and strengthening beam-column connections. The engineering analysis and construction are far more extensive, and partial or full tenant relocation during construction is sometimes necessary.

Enforcement and Consequences of Noncompliance

LADBS tracks compliance through its permitting and inspection systems. Property owners who miss deadlines receive notices of violation and may face escalating penalties. The city has the authority to impose daily fines, record compliance orders against the property title, restrict the issuance of new permits, and ultimately restrict occupancy.

Noncompliance also creates significant liability exposure. If an un-retrofitted building suffers earthquake damage and occupants are injured, the property owner's failure to comply with a known mandatory requirement will be a central issue in any resulting litigation.

Unreinforced Masonry Buildings

It is worth noting that Los Angeles addressed its most vulnerable building type, unreinforced masonry (URM) buildings, decades earlier under Division 88 of the LAMC, enacted in 1981. That program required the retrofit of approximately 8,000 URM buildings over a phased timeline that extended through the 1990s. While Division 88 compliance is largely complete, some URM buildings still have outstanding compliance issues, and property owners should verify their building's status with LADBS.

Financial Considerations

The cost of seismic retrofits varies widely. Soft-story retrofits for smaller apartment buildings may cost in the range of tens of thousands of dollars, while non-ductile concrete retrofits for large commercial structures can cost several million. Los Angeles has explored various financing programs and incentives to assist property owners, but the financial responsibility ultimately falls on the building owner.

Key Takeaways

Los Angeles mandatory seismic retrofit ordinances affect thousands of soft-story wood-frame and non-ductile concrete buildings across the city. Compliance timelines are defined and enforced by LADBS, with the soft-story deadlines largely expired and the non-ductile concrete deadlines extending further into the future. Property owners who have not yet begun the process should act immediately, as delays increase both enforcement risk and vulnerability to earthquake damage.