The Owner’s Guide to Los Angeles’ Non-Ductile Concrete Retrofit Ordinance
Last verified against official sources: July 6, 2026
In short:Los Angeles Ordinance 183893 (as amended by 184081, LAMC Division 95) requires owners of concrete buildings permitted before January 13, 1977 to evaluate and, where necessary, seismically retrofit them. The compliance clock runs from each building’s Order to Comply: 3 years to file a structural checklist, 10 years to submit retrofit plans, 25 years to finish construction. Roughly 1,500 buildings are covered, and for most, the critical 10-year plans checkpoint arrives around 2027–2028.
How we got here — a short history
“Non-ductile” is engineering shorthand for concrete framing that cannot bend without breaking. Before 1977, Los Angeles building codes did not require the reinforcing-steel details that let concrete columns deform and keep carrying load in an earthquake. The consequence has been demonstrated twice within living memory — and it took four decades, a newspaper investigation, and a university inventory to turn that knowledge into law:
Feb 9, 1971
The San Fernando earthquake (M6.6) collapses portions of the brand-new Olive View Medical Center and the VA Hospital in Sylmar, killing dozens — brittle (“non-ductile”) concrete framing is identified as a primary cause.
Jan 13, 1977
Los Angeles' modern ductile-detailing requirements take effect. Concrete buildings permitted for construction BEFORE this date are the ones the ordinance now targets.
Jan 17, 1994
The Northridge earthquake (M6.7) reconfirms the vulnerability: non-ductile concrete buildings suffer some of the most severe structural failures.
Oct 2013
The Los Angeles Times publishes its landmark concrete-buildings investigation, mapping the risk across the city and putting the issue on the political agenda.
Jan 2014
University of California researchers release an inventory of roughly 1,450 pre-1977 concrete buildings in Los Angeles — the first public list of potential candidates.
Nov 2015
The City of Los Angeles adopts Ordinance 183893 — the nation's most sweeping mandatory retrofit law — covering both wood-frame soft-story buildings and non-ductile concrete buildings (LAMC Division 95).
Feb 2016
Ordinance 184081 amends the program's time limits. Together the two ordinances define today's compliance framework.
2017 onward
LADBS begins serving Orders to Comply on identified concrete buildings. Each building's compliance clock runs from the date ITS order was served — which is why every owner should locate their order letter.
Sources: LADBS Non-Ductile Concrete Retrofit Program (official program page) · City of Los Angeles Ordinance 183893 · Los Angeles Times concrete-buildings investigation (2013) · UC concrete-building inventory (2014).
The compliance clock — three milestones every owner must know
Every deadline is measured from the date your building’sOrder to Comply was served — not from the ordinance date. Most orders went out beginning in 2017. If you don’t know your order date, that is the first thing to find: it is on the order letter, and LADBS’s non-ductile concrete unit can confirm it — (213) 978-4475, ladbs.nonductileconcrete@lacity.org.
3 years from your Order to Comply
Required: Submit a completed structural checklist to LADBS, prepared by a licensed engineer.
For most buildings ordered in 2017–2018, this checkpoint has already passed. If your building hasn't filed, you are out of compliance today.
10 years from your Order to Comply
Required: Submit proof of a previous retrofit, OR complete structural plans to retrofit, OR plans to demolish.
For buildings ordered in 2017–2018, this checkpoint lands around 2027–2028 (industry reporting of order-issuance dates; confirm your own order date with LADBS). Engineering, peer review, and plan preparation take 12–24 months — the procurement window for this deadline is now.
25 years from your Order to Comply
Required: Complete retrofit construction.
Roughly 2042–2043 for the earliest-ordered buildings. Owners who combine the retrofit with a repositioning or conversion typically build far earlier — construction pricing rarely gets cheaper by waiting.
The seven major risks of waiting
Life-safety risk — the reason the law exists
Non-ductile concrete buildings fail suddenly. Without the reinforcing details required after January 1977, columns can shatter rather than bend, and floors can pancake. These buildings are consistently identified by engineers as among the most dangerous structure types in an earthquake — the 1971 Olive View and 1994 Northridge failures are the canonical examples.
Legal and enforcement risk
An Order to Comply is a legal obligation with deadlines, not an advisory letter. Missing checkpoints exposes owners to escalating code-enforcement action from the Department of Building and Safety, and non-compliance becomes a permanent part of the building's public record — visible to any buyer, lender, or insurer that checks.
Financial risk — costs rise with delay
Commonly cited industry ranges run $30–$50 per square foot for the structural retrofit itself and roughly $50–$150 per square foot all-in depending on scope, occupancy, and finishes (treat all figures as planning ranges, not quotes — every building prices differently). Construction escalation compounds annually, and a compressed schedule near a deadline removes an owner's negotiating leverage.
Lender and insurance risk
Seismic risk shows up in every commercial transaction as a PML (Probable Maximum Loss) report. High PML on an un-retrofitted concrete building can shrink loan proceeds, raise earthquake-insurance premiums and deductibles, or block refinancing entirely — often years before any city deadline bites.
Transaction risk
An outstanding retrofit obligation transfers with the building. Buyers price it in — usually at a premium to what proactive compliance would have cost — and some institutional buyers simply pass. The obligation that isn't managed becomes a discount at sale.
Schedule risk — the 2027–2028 crunch
Hundreds of buildings share roughly the same 10-year plans checkpoint. Structural engineering firms, peer reviewers, and qualified retrofit contractors have finite capacity; owners who start late will compete for the same professionals at the same time, at peak pricing.
Operational and tenant risk
A well-planned retrofit is staged around occupancy — tenants stay, operations continue. A rushed one isn't. The difference between the two is planning time, which is exactly what waiting consumes.
Frequently asked questions
Which buildings does the LA non-ductile concrete ordinance cover?
Buildings with a roof or floor supported by concrete walls or columns, permitted for construction before January 13, 1977, in the City of Los Angeles. LADBS identifies buildings and serves Orders to Comply; owners can also be covered even if not yet identified. Check your building's status through the LADBS Property Activity Report or the department's non-ductile concrete unit.
What are the deadlines?
Three checkpoints, each measured from the date your building's Order to Comply was served: 3 years to submit a structural checklist, 10 years to submit retrofit plans (or proof of prior retrofit, or demolition plans), and 25 years to complete construction. Your dates depend on your order date — locate the order letter or confirm with LADBS.
What does a non-ductile concrete retrofit cost?
Industry-cited planning ranges are roughly $30–$50 per square foot for the structural work and $50–$150 per square foot all-in, driven by structural system, occupancy during construction, and scope. A feasibility-stage structural budget from a qualified retrofit contractor is the only number worth planning around.
Can tenants stay during construction?
Usually yes. Retrofits of occupied buildings are staged — floor by floor or zone by zone, with protection and off-hours work where needed. Keeping a building operating is a sequencing problem, and it is the difference between an experienced retrofit contractor and a low bid.
Do I need a structural engineer or a contractor first?
The engineer of record designs the retrofit; the contractor prices and builds it. The best results come from involving both early — a contractor's feasibility-stage budget and constructability review make the engineer's design cheaper to build. Lehigh Construction works alongside your engineer of record (our principal is a licensed Professional Engineer as well as a licensed general contractor).
Does converting a building under the Adaptive Reuse Ordinance change the retrofit obligation?
Conversion doesn't erase a Division 95 obligation — but it creates the ideal moment to satisfy it, because the building is already under construction. Most conversion candidates are pre-1977 concrete buildings, and the retrofit plus conversion structural scope should be planned and priced as one project.
Planning for the 10-year checkpoint?
Lehigh Construction has strengthened pre-1977 concrete buildings across Los Angeles for four decades — including many of Downtown’s landmarks. We provide feasibility-stage structural budgets and constructability review alongside your engineer of record, so your plans are priced by the people who will build them.
Lehigh Inc. dba Lehigh Construction Company · CSLB #714358. This guide is general information, not engineering or legal advice; confirm your building’s obligations with LADBS and your engineer of record.