TL;DR — Key Takeaways
- Most construction defect cases cannot be proved without expert testimony. What the defect is, what caused it, whether work met the standard, and what repair costs are all expert questions.
- California’s expert exchange is triggered by a demand made after the trial date is set, with a simultaneous exchange of expert information before trial.
- An expert who is not properly disclosed can be excluded from trial on the other side’s objection. That can end a case.
- A party who deposes the other side’s expert pays that expert’s reasonable fee for the deposition.
- The expert’s repair scope usually becomes the damages claim. An overreaching scope costs credibility.
- Expert costs can exceed the value of a small claim. That calculation belongs at the start of the case.
Most California construction defect cases turn on expert testimony, because the central questions, what the defect is, what caused it, whether the work met the applicable standard, and what a proper repair costs, are technical questions a judge or jury cannot answer from lay evidence. Experts must be disclosed under a formal exchange procedure before trial, and a party that fails to disclose properly can have its expert excluded. The expert’s repair scope typically becomes the damages claim, which makes choosing and directing the expert one of the most consequential decisions in the case.
Why experts are necessary
Standard of care. Whether a contractor, architect, or engineer met the standard of their trade or profession is generally proved through someone qualified in that trade or profession. Claims against design professionals require it before the case can even be filed.
Causation. A leak, a crack, or a failed component can have several possible causes, some attributable to the contractor and some not. Separating construction defects from maintenance failures, owner modifications, weather, and normal settlement is expert work.
The statutory standards. For new homes covered by the Right to Repair Act, the claim is measured against technical functionality standards for water intrusion, structural integrity, soils, and other systems. Proving a violation is an engineering exercise. Does the Right to Repair Act apply to you covers when those standards govern.
Repair cost. Damages in a defect case are usually the reasonable cost of repair. Establishing what repair is needed, and what it costs, generally requires a qualified estimator or engineer.
Qualification. California requires an expert to have special knowledge, skill, experience, training, or education in the subject of the testimony. A general contractor may be qualified on construction practice and not on structural engineering. Matching the expert to the question matters.
Retain early, designate later
Experts usually enter a construction case long before the formal exchange.
An expert retained early to help counsel evaluate the claim, often called a consulting expert, can inspect the site, review documents, and identify what failed and why while the evidence is still available. That early work frequently decides whether the case is worth pursuing, which defendants to name, and what to demand.
A consultant’s work is generally protected until the expert is designated to testify, at which point the expert’s opinions and the materials relied on become subject to discovery. That transition is worth planning, because what a designated expert reviewed and considered can be examined by the other side.
Retaining early also protects against a recurring expert problem in defect cases: an investigation that starts after the site has been repaired.
The disclosure procedure
California’s expert witness exchange follows a statutory sequence.
The demand. After the initial trial date is set, any party may demand a simultaneous exchange of expert witness information. The demand must be served within a set window keyed to the trial date.
The exchange. On the date set in the demand, all parties exchange lists of the experts they expect to call. For retained experts, the exchange includes a declaration describing the expert’s qualifications, the general substance of the expected testimony, the expert’s agreement to testify, and the expert’s fee. If the demand requests it, parties also exchange discoverable reports and writings.
Supplemental designation. Within a short period after the exchange, a party may designate additional experts on subjects the other side’s experts addressed that it had not.
Depositions. Experts may then be deposed. The party taking the deposition of the other side’s expert must pay that expert’s reasonable and customary hourly fee for the deposition time.
What happens if you miss it
This is where cases are lost.
If a party that fully and timely complied with the exchange objects, the court shall exclude the expert opinion of any witness offered by a party that unreasonably failed to list the witness, submit the required declaration, produce requested reports, or make the expert available for deposition.
The exclusion is mandatory once its conditions are met. In a defect case, losing the expert on causation or repair cost can mean there is no admissible evidence on an essential element, and the case may not survive.
Relief is available in narrow circumstances, typically where the failure resulted from mistake, inadvertence, or excusable neglect and the request is made promptly, and courts can permit late designation on terms. But relying on relief is not a strategy. The deadlines are fixed by the trial date, and they need to be calendared the day the trial date is set.
If your case has a trial date and you have not calendared the expert demand and exchange, that is worth addressing today. Call Bay Legal at (650) 668-8000 in Northern California or (213) 668-8000 in Southern California.
Cost, and what drives it
Expert costs in a construction case are substantial and scale with the complexity of the defects, the number of trades involved, and how far the case goes. What drives them:
Investigation. Site inspections, destructive testing, laboratory analysis, and document review.
Reports. Written findings, repair recommendations, and cost estimates.
Depositions. Preparation and testimony, plus the reverse: deposing the other side’s experts, whose fees the deposing party pays.
Trial. Preparation and testimony.
Multiple experts. A case involving waterproofing, structural issues, and mechanical systems may need a separate expert for each, plus a cost estimator.
Recovering expert costs. Expert fees are not ordinarily recoverable as costs by the prevailing party. A formal statutory offer to compromise that the other side rejects and then fails to beat can allow the offering party to recover its post-offer expert fees, in the court’s discretion. Offers to compromise under section 998 covers how that works.
How the expert’s scope shapes damages
In a defect case the expert’s repair recommendation usually becomes the damages number, which creates a real tension.
The pull toward overreach. A broad repair scope produces a larger claim. A recommendation to replace the entire building envelope rather than repair the failed sections, or to upgrade beyond the original standard, inflates the number.
Why overreach backfires. The other side’s expert will attack a scope that goes beyond what the defect requires, and a jury that concludes the plaintiff’s expert overreached may discount everything that expert said, including the parts that were right. Courts can also limit damages to the reasonable cost of repair.
The better approach. A scope that addresses what failed, with the reasoning shown, is more persuasive and more durable than a maximal one. The strongest expert is usually the one the other side’s expert has the hardest time contradicting.
When the experts disagree
In most defect cases they will. The other side’s expert will attribute the problem to a different cause, recommend a narrower repair, or estimate a lower cost.
The trier of fact decides between them, weighing qualifications, the quality of the investigation, whether the opinion is grounded in the evidence, and how the expert holds up on cross-examination. Courts also act as gatekeepers and can exclude expert opinion that rests on speculation or on reasoning that does not connect the data to the conclusion.
Disagreement between experts is often what settles a case. When both sides see a credible expert on the other side, the risk of trial becomes concrete, and a mediated settlement frequently follows. Mediation, arbitration, or trial covers that.
When the expert costs more than the claim
Worth saying directly.
For a modest defect, the cost of retaining, deposing, and presenting experts can approach or exceed the realistic recovery, particularly where fees are not recoverable and the defendant will retain experts of its own. In that situation the right course may be an early expert inspection used to support a negotiated resolution, a claim sized to fit small claims or limited civil court, or a decision not to litigate at all.
The expert analysis worth paying for is the one that tells you early whether the claim is strong enough, and large enough, to justify the rest. Is my lawsuit worth it works through that decision.
Bay Legal retains and works with construction experts for owners and contractors. Reach us at (650) 668-8000, (213) 668-8000, or through baylegal.com/contact-us.
Frequently Asked Questions
Why do California construction defect cases require experts?
Because the central questions are technical: what the defect is, what caused it, whether the work met the standard of the trade or profession, and what a proper repair costs. Those generally require testimony from someone with special knowledge, skill, experience, training, or education in the subject.
When must experts be disclosed and what happens if you miss it?
After the initial trial date is set, any party may demand a simultaneous exchange of expert information on a date keyed to the trial date. If a party unreasonably fails to list an expert, provide the required declaration, produce requested reports, or make the expert available for deposition, the court must exclude that expert’s opinion on the objection of a party that complied.
What do construction experts typically cost?
Costs are substantial and scale with the number of defects and trades involved, the testing required, and how far the case goes. Investigation, reports, depositions, and trial testimony each add cost, and a party deposing the other side’s expert pays that expert’s reasonable deposition fee. Expert fees are not ordinarily recoverable except in specific circumstances.
How does the expert’s scope shape the damages claim?
The expert’s repair recommendation usually becomes the damages figure. A scope that goes beyond what the defect requires invites attack and can undermine the expert’s credibility on everything else, while a scope that addresses what failed, with its reasoning shown, is generally more persuasive.
What happens when the experts disagree?
The judge or jury weighs the competing opinions on qualifications, investigation quality, grounding in the evidence, and performance on cross-examination. Courts can also exclude opinion that rests on speculation. Credible experts on both sides often make the risk of trial concrete enough to produce a settlement.
