Los Angeles

Non-Ductile Concrete Structures

On October 13, 2015, the city of Los Angeles passed Ordinance #183893, which includes the LA Non-Ductile Reinforced Concrete Ordinance found here: Article 1, Division 95: Mandatory Earthquake Hazard Reduction in Existing Non-Ductile Concrete Buildings.


Los Angeles’ mandatory non-ductile concrete ordinance applies to existing buildings that have the following characteristics:

  • Reinforced concrete construction
  • Construction permit was applied for prior to January 13, 1977

This ordinance excludes detached single-family dwellings and detached duplexes.

It is currently estimated that approximately 1,500 buildings in the city of Los Angeles fall within the scope of this ordinance.


The city of Los Angeles requires that non-ductile concrete building retrofits adhere to the timeline shown below. The timeline is similar to that of the wood-frame soft-story retrofit mandates; however, longer time allowances were established between action items. It is expected that Orders to building owners will be delivered within the first 1.5 years following the ordinance’s approval in November 2015. Once the Order has been received, the subsequent deadlines are initiated.

BEGIN PROCESS Order received by building owner
3 YEARS AFTER ORDER Submit one of the following:
1. Proof that structure meets ordinance requirements OR
2. Plans for retrofit OR
3. Plans for demolition
10 YEARS AFTER ORDER Obtain one of the following:
1. Permit for rehabilitation OR 
2. Permit for demolition
25 YEARS AFTER ORDER Complete one of the following:
1. Construction/retrofit OR
2. Demolition


In the News

L.A. races to fix vulnerable buildings before next major earthquake (LA Times)

Los Angeles Passes Nation's Strictest Seismic Retrofit Ordinance (ASCE)




Wiss, Janney, Elstner Associates, Inc.
Phone: 626.696.4650
E-mail: seismicordinances@wje.com

LADBS Non-Ductile Concrete Retrofit Unit
201 N. Figueroa Street, Suite 880, Los Angeles, CA 90012
E-mail: LADBS.nonductileconcreteretrofit@lacity.org