When Los Angeles officials opened a probe into alleged unpermitted construction at the Lineage cold-storage site in Boyle Heights in June 2026, as reported by CBS News, litigators read the news differently than the public did. A permitting question is rarely just paperwork. Pull on it and a defendant's claim that a building was reasonably safe can come apart. For attorneys handling fire and premises liability cases in California, that question runs straight to a building code expert witness.
Unpermitted work skipped the inspections meant to catch dangerous conditions before people occupy a space. A wall framed without a permit was never checked for fire-rated assembly. An added mezzanine was never reviewed for occupancy load or egress. When a fire spreads or someone is hurt, the gap between what the code required and what was actually built becomes the case. A construction defect expert witness in Los Angeles turns that gap into something a jury can weigh.
Why Unpermitted Construction Changes the Liability Analysis
Permits and inspections create a documented chain of accountability. When that chain is missing, you lose the easy reference points, but you gain a stronger narrative. A property owner who built without permits chose to bypass the review process that exists to protect occupants. That choice speaks to the standard of care.
A building code expert witness starts by reconstructing what the applicable code required at the time of construction. In California, that means the California Building Code and California Fire Code, which adopt and amend the model International codes, plus any local ordinances the city or county layers on. The expert identifies the version in force, the occupancy classification that governed the space, and the specific provisions the work should have satisfied.
From there, the expert documents the divergence. Was the structure altered in a way that changed its occupancy group without triggering a code analysis? Were fire separations, sprinkler coverage, or exit paths compromised by work no inspector ever saw? Unpermitted construction produces exactly these latent hazards, because surfacing them is the point of the permit process. Skip the process and the defects survive into occupancy.
Establishing Duty Through Code-Compliance Testimony
Duty in a premises case is framed around what a reasonable property owner should have done. Building codes give that abstract standard a spine. They are the minimum, legislatively adopted baseline for safety, and a defendant who fell below it has a hard time arguing the conduct was reasonable.
A code-compliance expert maps the defendant's obligations to specific code sections rather than general principles. Instead of testifying that a building "should have been safer," the expert can explain that a particular assembly was required to carry a one-hour or two-hour fire rating, that a given exit had to maintain a minimum clear width, or that an occupancy of a certain size triggered an automatic sprinkler requirement. That specificity lets the jury anchor the duty to a written rule rather than to competing opinions about reasonableness.
Code violations in California are not negligence per se on their own, but they are strong evidence of the standard of care. The expert lays that evidence out plainly: here is what the code required, here is what was built, and here is the distance between the two.
Connecting the Defect to Causation in Fire Cases
Proving a violation existed is half the work. The harder question is whether the violation caused or worsened the harm. Here a building code expert witness often works alongside a fire origin-and-cause investigator, and the division of labor matters.
The fire investigator addresses where and how a fire started. The building code or construction defect expert addresses how the building's condition affected the outcome once it was burning. A missing fire-rated separation can let flames move into a space that should have been protected. A blocked, locked, or undersized exit can turn a survivable event into a deadly one. Combustible construction where the code required noncombustible material can accelerate spread.
In an unpermitted-construction case, this causal link is often stronger, because the dangerous condition was never reviewed by anyone. The expert analyzes how the building actually behaved during the incident and compares it to how a code-compliant structure would likely have performed. That comparison, grounded in code requirements and accepted fire-protection engineering principles, connects the paper violation to the real-world harm.
What to Look For When Retaining the Expert
Not every construction expert fits a life-safety case. The skill set you need depends on what the building was supposed to do and where it failed.
- Code expertise that matches the building. Someone fluent in the California Building Code and California Fire Code, including how local amendments apply in your jurisdiction, will be more credible than a general contractor opining from experience alone.
- Relevant licensing or certification. Depending on the issue, look for a licensed architect, a professional engineer, a certified building official, or a fire-protection engineer. The right credential survives challenges to qualification.
- Fire and life-safety experience. A defect expert who handles water intrusion and stucco claims is not the right witness for an egress or fire-separation case. Ask directly about prior work on fire and premises matters.
- Testimony history. An expert who can explain occupancy classification or fire-rating requirements to a lay jury is worth more than one who writes a technically perfect but impenetrable report.
Bring the expert in early. Unpermitted construction cases turn on physical evidence that does not survive long. Conditions get repaired, demolished, or altered, and permit records have to be pulled and interpreted. An expert engaged at the outset can guide preservation and document the as-built conditions before they change.
A Practical Takeaway
When a defendant built outside the permit system, the case is rarely about a single missing signature. It is about the inspections that never happened and the hazards that survived because of it. A building code or construction defect expert gives you the framework to show, section by section, what the law required and how the construction fell short, then to tie that shortfall to the duty owed and the harm suffered.
If you are evaluating candidates for one of these matters, compare credentials and disciplines side by side before you commit. You can browse listed building code and construction defect expert witnesses in California to see how different experts describe their backgrounds, licensing, and litigation experience, and narrow the field to those who fit the specific failure your case turns on.
This article is general educational information for attorneys and is not legal advice.