Expert witness for claims related to poorly executed construction work in Ibiza

When a renovation or construction project is not carried out according to the agreed terms, the affected owner has the right to claim damages. Hiring a specialist in defective construction work is the most crucial step in transforming a technical issue into solid evidence in any proceeding, whether it be direct negotiation with the contractor, mediation, or legal action. At Optima Pericial, an expert witness firm located in Ibiza and operating throughout the Balearic Islands, we help owners and companies document, quantify, and claim damages resulting from faulty construction work, providing expert reports with full legal validity.

Ibiza boasts a very active real estate and new construction market, with a demand for renovations and new builds that are not always executed to the promised quality. Construction defects, substandard finishes, and poorly executed installations generate disputes that require rigorous technical assessment to be resolved favorably. This article explains in detail how the expert assessment process works in these cases, what types of defects can be claimed, and what the applicable legal framework is.

What is a construction expert and what is their role in a claim?

A construction expert is a technician with specialized training —usually an architect, technical architect or engineer— whose main function is to objectively and impartially analyze the actual state of a work or building.

Their intervention is crucial when there is a discrepancy between what the contractor claims to have delivered and what the owner has received. The expert acts as a technical bridge between the dispute and the legal system.

Technical inspection and defect analysis

The expert's first task is to conduct a detailed visual inspection of the affected property. During this visit, they examine all construction elements, finishes, installations, and structural components that show any anomalies.

This phase includes comprehensive photographic documentation, taking measurements, and sometimes conducting tests or technical trials on the materials. Every defect detected is recorded with technical precision.

Next, the expert determines the root cause of each failure: whether it is due to a design flaw, a manufacturing defect, the use of unsuitable materials, or a combination of factors. This causal determination is fundamental for establishing liability.

Economic valuation of the damages

Identifying defects is not enough. The expert report must accurately quantify the cost of repairing or correcting each construction defect detected.

This economic valuation is prepared using current market prices, recognized construction databases, and objective technical criteria. The result is a substantiated figure that the owner can use to file a claim against the party responsible for the construction work.

In cases where the work has been left unfinished, the expert also determines the percentage of actual execution with respect to the agreed budget, which makes it possible to calculate whether the contractor has been paid more than what has been done.

Preparation of the legally valid expert report

The final result of all this work is the technical expert report, also known as the expert opinion. This document outlines the methodology used, the technician's observations, the cause of the defects, their extent, and the economic valuation.

A well-structured report, signed by a qualified expert, is fully admissible as evidence in civil court proceedings. The courts place particular value on it when it is backed by proven experience in the construction sector.

At Optima Pericial, we prepare these reports with the technical rigor and legal structure necessary to ensure they have the maximum probative value, both in out-of-court negotiations and in court.

Types of construction defects that can be claimed

Not all defects in a construction project have the same origin or the same legal severity. The classification of defects is relevant because it determines the time limits for filing claims and the applicable liability regime.

Structural defects

These are the most serious. They affect the elements that guarantee the mechanical resistance and stability of the building: foundations, pillars, beams, slabs, load-bearing walls and other supporting elements.

Common examples include significant structural cracks, differential settlement of the foundation, excessive deflection in floor slabs, and failures in the metal structure. These defects can compromise the safety of the building and its occupants.

The Building Regulations Law (LOE) establishes a ten-year warranty period for this type of defect, counted from the date of acceptance of the work.

Defects in installations and construction elements

This group includes faults that, without jeopardizing the stability of the building, cause uninhabitable conditions or affect the proper use of the property.

Common examples include dampness due to seepage or condensation, problems in electrical, plumbing or air conditioning installations, defects in thermal or acoustic insulation, and cracks that allow water to enter.

For this type of defect, the Spanish Building Regulations (LOE) establish a three-year warranty period . At Optima Pericial, this is one of the areas where we handle the most cases on the island of Ibiza, given the high volume of comprehensive renovations and rehabilitation projects.

Finishing defects and surface flaws

These are minor technical defects, but they still constitute a breach of contract. They include poorly applied paint, uneven flooring, woodwork that doesn't close properly, peeling wall coverings, or installations that aren't functioning correctly.

The Building Regulations (LOE) stipulate a one-year warranty period for these defects from the date of completion of the work. Although the period is shorter, these defects are the most frequent and also those that most commonly result in claims.

Unfinished or partially completed works

There is an additional category that affects cases where the contractor has abandoned the work before its completion, or has delivered work that does not correspond to the agreed budget.

In these situations, the expert measures and assesses the degree of completion, comparing what has actually been done with what is stated in the contract and project documents. This allows them to determine if the owner has overpaid or if they have the right to retain part of the price.

Legal framework for claiming a defective work in Spain

Claims for defective construction are covered by several regulations that should be understood before taking any action. Understanding the current legal framework allows you to act within the correct timeframes and with the appropriate arguments.

The Building Regulations Act (LOE)

Law 38/1999, on Building Regulations, is the reference standard for large-scale construction projects. It establishes the responsibilities of the parties involved in the construction process: developer, designer, project manager, construction manager, and builder.

The LOE sets the aforementioned warranty periods (10, 3, and 1 year) and establishes that the deadline for bringing a liability claim in court is two years from the date the damage becomes apparent. This deadline is independent of the warranty period for the defect itself.

This law applies primarily to new construction, extensions, and renovations of a certain scale. For partial renovations or minor works, other regulations apply.

The Civil Code and the construction contract

When the LOE is not directly applicable —as happens in many domestic renovations or smaller-scale works—, the claim is based on the Civil Code, specifically on the articles relating to the contract for the lease of work.

Article 1544 of the Civil Code governs this type of contract, establishing reciprocal obligations: the contractor must deliver the work with the agreed quality, and the owner must pay the price. If the contractor fails to comply, the owner may demand repairs, a price reduction, or termination of the contract.

For actions based on breach of contract, the Civil Code establishes a five-year statute of limitations, which offers more time than the LOE in certain cases.

The breach of contract exception

A legal tool of great practical relevance is the so-called exceptio non adimpleti contractus, consistently recognized by the jurisprudence of the Supreme Court.

This exception allows the owner to legitimately refuse to pay the full agreed price when the contractor has not fulfilled their part of the contract, i.e., when the work has significant defects or is incomplete.

To successfully invoke this exception, an expert report certifying the defects and their economic value is essential. Without this technical evidence, the owner's position in any dispute—whether in or out of court—is significantly weakened.

The General Law for the Defense of Consumers

When the owner is an individual contracting the work as an end consumer, they can also rely on the General Law for the Defense of Consumers and Users. This law establishes a six-month period for hidden defects in the provision of services, although the time limits under the Civil Code and the Building Regulations Act (LOE) are usually more favorable in most cases.

How to file a claim step by step when a job is done badly

Acting in an organized and documented manner makes the difference between a successful claim and one that fails. The recommended process for handling these types of disputes is described below.

Step 1: Formal communication with the person in charge of the work

The first step is always to notify the contractor or responsible company of the detected defects. This notification must be made in writing with proof of receipt, preferably by registered mail or certified letter.

The document should detail the observed errors, formally request their correction within a reasonable timeframe, and attach any available evidence: photographs, videos, delivery notes, or any other relevant document.

This step is crucial because it proves that the owner gave the contractor an opportunity to resolve the problem before escalating the claim. Furthermore, it interrupts the statute of limitations.

Step 2: Commissioning the technical expert report

Regardless of whether the contractor responds to the notification or not, the next step is to commission a specialized expert to prepare a technical report on the defects.

This report is the cornerstone of any claim for shoddy workmanship. It must identify construction defects, determine their cause, assess their extent, and quantify the cost of repairs. Without this technical evidence, it is very difficult to sustain a claim in court or even with the contractor's own insurance company.

At Optima Pericial we carry out this inspection with rigorous methodology, preparing reports that meet all the formal and technical requirements demanded by the courts of the Balearic Islands.

Step 3: Extrajudicial route — mediation and negotiation

Once the expert report is available, it is possible to try to resolve the conflict out of court. This alternative is faster and cheaper than litigation, and in many cases leads to satisfactory agreements.

The available options include direct negotiation between the parties supported by the expert opinion, mediation through an impartial third party, or consumer arbitration if the service has been provided to an end consumer.

In Ibiza, the volume of conflicts arising from construction work on tourist and residential properties makes the extrajudicial route especially valued for its speed.

Step 4: legal claim

If the previous options are unsuccessful, the owner may file a civil lawsuit in the competent courts. The expert report prepared in the previous phase becomes the main technical evidence in the proceedings.

In the judicial process, the expert may be called upon to ratify and defend their opinion before the judge, which requires that the report be written with methodological rigor and that the expert have experience in the oral defense of their conclusions.

In cases where the defects involve an urban planning violation —for example, works carried out without a license or that do not comply with planning regulations—, a complaint can also be filed with the Ibiza City Council or the competent island body, independently of any civil action.

What should an expert report on construction defects contain?

The quality and structure of an expert report largely determine its effectiveness as evidence. A well-prepared report makes the difference between winning or losing a claim.

Identification of the assignment and the expert

Every expert report must begin with the identification of the expert —name, qualifications, professional registration number—, the description of the assignment received and the list of documentation and sources consulted to prepare the report.

This section certifies the technical training of the signatory and establishes the framework for expert action, which is an essential requirement for the report to be valid in court.

Technical description of the defects detected

The core of the report is a detailed description of each identified construction defect. Each defect must be described, indicating its exact location, extent, technical nature, and supporting evidence.

Photographic documentation plays an essential role in this section. Images should be georeferenced whenever possible and accompanied by plans or sketches that spatially locate each anomaly.

Causal analysis

The report must explain why the defects occurred, not just describe them. Causal analysis is the most technically demanding part of the report and the one that most influences the determination of liability.

An error in execution, the use of unsuitable materials, poor supervision by the site manager, or a project with design flaws generate different liabilities and affect different stakeholders. The expert must accurately distinguish between these scenarios.

Substantiated economic valuation

The damage assessment must be transparent and verifiable. The report must detail the repair items, the corresponding measurements, and the unit prices applied, referencing recognized construction databases.

A well-founded valuation carries far more evidentiary weight than a lump sum figure without a breakdown. Courts particularly value reports that allow for the comparison and verification of economic calculations.

Conclusions and signature of the expert

The report must conclude with clear and concise conclusions that directly answer the questions raised in the assignment. These conclusions are the summary that the judge, lawyer, or insurer will read first.

The expert's signature, along with their qualifications and professional registration number, attests to the authorship and technical responsibility of the report. In legal proceedings, the expert may be required to ratify their opinion under oath.

Claim against the contractor's insurer

Many construction companies and contractors carry liability insurance that covers damages caused by faulty workmanship. When this coverage exists, the homeowner can file a claim directly with the insurer.

How an insurance claim works

Once the insurance company is notified of the loss, it appoints its own adjuster to assess the damages. The difference between the company's valuation and the insured's actual losses is usually the main source of conflict in these claims.

Having an independent expert reportprepared

An appraisal prepared by an independent technician allows the owner to negotiate from a position of equality with the insurer. Without this document, the company's valuation usually prevails, resulting in financial losses for the claimant.

At Optima Pericial, we have in-depth knowledge of the valuation protocols applied by insurance companies, which allows us to prepare expert reports specifically aimed at refuting low valuations and substantiating claims for the real amount of the damage.

The expert for the party versus the expert for the insurance company

When the owner submits their own expert report, the insurer can accept the valuation, propose an intermediate figure, or maintain its initial position. In the latter case, both parties can appoint a third expert whose decision will be binding.

For the expert's report to have any real impact on this process, it must be prepared with the same technical rigor and formal structure as the insurer's report. An incomplete or poorly substantiated report loses credibility in any expert comparison.

Third-party liability insurance and ten-year liability insurance

In addition to the contractor's civil liability insurance, the Building Regulations Law requires the developer to take out a ten-year insurance policy that covers structural damage for ten years from the date of acceptance of the building.

This insurance is mandatory for new construction projects intended for residential use. Activating it requires prior technical verification of the structural damage, which again makes the expert report an essential document for initiating the claims process.

In renovations or construction projects that lack current ten-year structural warranty or liability insurance, claims must be filed directly against the responsible party through civil proceedings. The expert report retains its value as essential evidence in all cases.

When is it essential to act quickly?

In claims for defective construction work, time is of the essence for the property owner. There are situations in which delaying an expert assessment can irreversibly jeopardize the claim.

When defects are evolving

Some construction defects are progressive in nature: rising damp, widening cracks, or installations that cause secondary damage. In these cases, an expert inspection should be carried out as soon as possible to document the initial condition and correctly attribute the damage to the source of the problem.

If action is delayed, the responsible party may claim that subsequent damages are a consequence of the passage of time or a lack of maintenance by the owner, making it difficult to determine responsibility.

When the contractor threatens to initiate legal action

It is common for contractors, when faced with a homeowner's refusal to pay the full amount for the work, to threaten legal action for non-payment. In this scenario, the homeowner needs an expert report documenting the contractor's breaches of contract before initiating legal proceedings.

Without that prior technical test, the owner may find themselves in a very weak defensive position within the legal process, without solid technical arguments to justify withholding payment.

When the end of the warranty period is approaching

The time limits established by the LOE (Law on Building Regulations) are mandatory, meaning they are neither interrupted nor suspended except in very specific cases. If the one-year warranty period for finishing defects is about to expire, it is urgent to document the defects and formally notify the relevant authorities before that period ends.

At Optima Pericial we advise our clients in Ibiza not to wait for the conflict to worsen: an early expert inspection is always more effective and less costly than a late intervention.

Particularities of the construction market in Ibiza

The specific context of Ibiza adds relevant particularities to claims for defective works that should be taken into account.

High turnover of contractors and renovation companies

The dynamism of Ibiza's real estate market attracts a large number of construction companies and self-employed individuals, not all with the same level of expertise. This high turnover increases the risk of hiring a contractor who does not meet the required technical standards.

In this environment, having a well-documented expert opinion from the outset is especially valuable, as it facilitates the identification of the responsible party before they can disappear or cease their activity.

Construction in protected environments and with specific regulations

Ibiza has large areas under urban and environmental protection regulations. Construction work carried out in these areas must comply with specific regulations that go beyond the general requirements of the Building Regulations Act (LOE).

When a construction project fails to comply with these additional regulations—for example, in specially protected areas or listed buildings—the damages can extend beyond mere economic losses, also affecting the legality of the building. The expert must be familiar with this regulatory framework to properly assess all the implications of the defect.

Properties for tourist use and second residence

A significant portion of the construction work carried out in Ibiza involves properties intended for tourist rentals or second homes. In these cases, the indirect damages resulting from substandard work—such as the inability to operate the property during the repair period—can be as significant as the direct material damages.

The expert report may include the assessment of these indirect damages, quantifying the lost profits suffered by the owner as a result of the deficient execution of the work.

Conclusion: technical evidence is the basis of any claim for defective work

When a project fails to meet the agreed-upon specifications, the owner has a range of legal and technical tools at their disposal to enforce their rights. However, none of these are effective without a solid evidentiary basis.

The expert report prepared by a construction specialist is the document that transforms a complaint into evidence, and evidence into a well-founded claim. Without it, any negotiation or litigation starts at a disadvantage.

If the construction work you've contracted in Ibiza has defects, construction flaws, poor finishes, or is unfinished, don't wait for the problem to escalate. Acting quickly and with the right technical support is the best way to protect your investment and defend your rights.

Contact Optima Pericial, experts specializing in defective construction work in Ibiza

Optima Pericial is an expert witness firm located in Ibiza and operating throughout the Balearic Islands, specializing in the preparation of expert reports for both judicial and extrajudicial purposes. It provides damage assessment services, issues technical reports for legal proceedings, and offers technical assistance in insurance claims, with a rigorous and objective approach based on in-depth knowledge of the internal protocols of insurance companies.

Their experience with real-world cases of defective construction in Ibiza has allowed them to help homeowners obtain compensation far exceeding initial offers, as well as defend clients against unjustified claims. If you need an expert for a claim related to shoddy construction in Ibiza or anywhere in the Balearic Islands, contact Optima Pericial: we will put all our technical expertise at your disposal so you can file your claim with the strongest possible guarantees.