AEO Answer · Structural

What Does Hospital Seismic Compliance Require in California?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of a structural load path: roof and floor loads travel through beams and columns down to the foundation footings.

The concise answer

California hospital seismic compliance requires acute care buildings to meet Structural Performance Category ratings under OSHPD/HCAI jurisdiction, with retrofit or replacement of noncompliant buildings by the 2030 deadline — involving seismic evaluation, retrofit engineering, and OSHPD plan review. California decided after the 1971 San Fernando and 1994 Northridge earthquakes that hospitals must not just survive earthquakes but keep operating through them. The Alquist Act and its amendments created the most demanding hospital seismic program in the country — with ratings, deadlines, and a dedicated enforcement agency. Every California hospital project lives inside this framework.

How the compliance program works

It starts with evaluation: a formal seismic assessment that assigns the SPC and NPC ratings. For buildings below the required ratings, the options are retrofit to the standard, replacement with new compliant construction, or removal from acute care service. Retrofit design brings the lateral system, foundations, and — critically — the nonstructural systems up to the performance level, because an SPC-4D building has to function after the earthquake, not merely avoid collapse. OSHPD/HCAI jurisdiction covers the plan review and construction observation, with requirements for special inspection and structural observation that exceed typical projects. The 2025 California Energy Code / 2025 Standards, effective January 1, 2026, also apply to the energy systems in these projects — compliance programs have to satisfy seismic and energy requirements together.

Planning a California hospital seismic program

These are multi-year capital programs, not single projects. How I approach them:

Start with formal SPC/NPC evaluations — you can't plan without the ratings
Evaluate retrofit versus replacement honestly: sometimes new construction wins
Design the nonstructural scope — bracing, anchorage, equipment — with the same rigor as the structure
Plan the schedule around OSHPD/HCAI review cycles and special inspection requirements
Phase construction so the hospital keeps operating — acute care can't shut down for its own retrofit

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?Dual system seismic design California structural seismic requirements ASCE 7 seismic design categories How much does structural engineering cost?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

What is the 2030 deadline for California hospitals?

Under the Alquist Act as amended, acute care hospital buildings must meet SPC-4D or higher — essentially, be able to remain operational after a major earthquake — by January 1, 2030. Buildings that can't comply must be retrofitted, replaced, or taken out of acute care service. Extensions exist for some facilities, but the deadline has driven a generation of seismic retrofit projects.

What are SPC ratings?

Structural Performance Categories rate a hospital building's expected seismic performance, from SPC-1 (high risk of collapse) to SPC-5 (reasonably capable of continued operation). The rating comes from a formal seismic evaluation. Nonstructural performance gets its own NPC rating. Together they determine what the building needs — and by when.

What does OSHPD plan review involve?

OSHPD — now HCAI — reviews and approves hospital construction documents in California, and the review is more detailed than typical building department plan check. Structural, MEP, and fire protection all get reviewed, with special attention to seismic bracing of nonstructural components and equipment anchorage. I plan the schedule around it because the review cycles are real.

What does a hospital seismic retrofit typically include?

Strengthening the lateral system — new shear walls, braced frames, or moment frame upgrades — plus foundation work where needed, and comprehensive anchorage and bracing of nonstructural systems: medical gas, emergency power, HVAC, ceilings, and equipment. The nonstructural scope is often as big as the structural scope, because the SPC rating requires the building to function, not just stand.

Ready to discuss your engineering scope?

Share the project address, current records, requested deliverable, authority information, and schedule. Apex Grid confirms professional responsibility, availability, and scope before work begins.

Request a Project Review