Ten-year construction liability: how experts assess long-tail structural claims

What ten-year liability means in practice

In civil-law systems such as France and several Middle Eastern and North African states, builders and designers bear a strict liability for around ten years for defects that threaten the stability of a structure or make it unfit for use. Owners or contractors in those markets often must hold decennial liability insurance, and international contractors from the UK, Ireland, the US, Canada or Australia regularly meet this requirement when working abroad.

English-speaking jurisdictions reach a similar result by other routes. Structural warranties on new homes typically last ten years, latent defects insurance often runs for ten or twelve years, and limitation periods or statutes of repose cap how long claims can be brought. In England and Wales, the Building Safety Act 2022 significantly extended the time for certain claims under the Defective Premises Act, which has revived interest in long-tail liability.

Which damage falls inside the ten-year window

The focus is on serious defects: failing foundations, movement in load-bearing structure, collapse risk, major water penetration through the envelope or defects that make the building unusable for its purpose. Finishes, minor cracking and equipment failures are generally outside, or fall under shorter guarantees.

The experts on each side of the file

When a claim is made under a decennial or latent defects policy, the insurer appoints a technical expert or loss adjuster, often supported by a structural or geotechnical engineer. In many decennial markets, a technical inspection firm also reviewed the design and construction before cover was granted, and its reports become key evidence.

The building owner, or the contractor facing a recourse claim, can appoint their own independent expert. That adviser reviews the inspection history, investigates cause and argues for a repair that restores stability and use in the long term. If the matter goes to court, a judicial or tribunal-appointed expert may also be named.

Investigating damage that developed slowly

Long-tail claims depend on reconstructing a story that may have started on the drawing board. The expert works backwards from symptoms to the original design and construction decisions.

• Survey and monitoring of movement, levels and cracking over a meaningful period.
• Review of geotechnical reports, structural calculations and design changes during construction.
• Examination of technical inspection reports and handover or acceptance records.
• Intrusive investigation such as trial pits, cores or opening-up of the envelope.
• Analysis of maintenance history, alterations and changes of use since completion.

Proving the date of first appearance

Timing is decisive. The owner must usually show that the damage became apparent within the cover period and was notified promptly. Dated photographs, earlier surveys, emails to managing agents and maintenance logs can establish when the problem was first noticed.

Where claims under ten-year cover are contested

Because so much time has passed, insurers have more room to suggest alternative explanations for the damage. Typical arguments include:

• The damage is not serious enough to meet the threshold for structural or fitness-for-use defects.
• Lack of maintenance, later alterations or changes in use caused or worsened the problem.
• External factors such as nearby excavation, trees or exceptional weather are responsible.
• The defect was visible at handover and should have been reserved at acceptance.
• The proposed repair goes beyond what is needed, for example full underpinning where local works would suffice.
• Notification came after the cover period or long after the owner became aware.

Costing a lasting structural repair

Structural remediation is expensive and disruptive, so the method matters as much as the price. The owner's expert should define the repair strategy with engineering support, then price it fully: investigation, design, statutory approvals, temporary works, the repair itself, reinstatement of finishes and, if covered, relocation of occupants or loss of rent.

Comparing two clearly specified schemes, one from each side, often narrows the gap faster than debating a single global figure.

When to appoint your own expert

Independent advice is strongly recommended when the insurer disputes cause or seriousness, when the repair proposal seems minimal, when several apartments or units are affected, or when a contractor faces a recovery action after the insurer has paid the owner. On international projects, an expert familiar with the local decennial regime and language avoids costly misunderstandings.

Act early: limitation and notification rules are strict, and evidence weakens every year. Where internal complaints fail, policyholders may be able to use an ombudsman scheme, mediation or the courts, depending on the country and the size of the claim.

Ten-year liability claims hinge on timing, seriousness and cause, each of which must be proved long after the works ended. Securing an independent expert as soon as damage appears keeps those arguments in the owner's favour.