Cracks and structural damage: getting the cause, and the claim, right

Hairline or structural? Reading what the walls are saying

Most buildings crack a little. Plaster shrinkage, seasonal timber movement and minor settlement of new construction produce fine cracks that are usually cosmetic and normally fall outside cover as wear and tear. Structural damage is different: cracks that widen over time, run diagonally from the corners of windows and doors, are wider at one end, appear on both sides of a wall, or come with sticking doors and sloping floors suggest that part of the building is moving.

Engineers often grade cracks by width and pattern rather than by appearance alone, and they want to know whether the movement is ongoing or historic. That distinction matters because insurers generally pay for damage caused by a sudden insured event, not for slow deterioration or defects that existed before the policy started.

Causes that are usually insured, and those that are not

Wording differs widely between countries and policies, so treat this as orientation rather than a rule.

• Often covered, subject to wording: subsidence, heave or landslip (common in UK buildings policies), impact by vehicles or falling trees, explosion, escape of water undermining foundations, storm damage to structure.
• Often excluded: normal settlement and shrinkage, faulty design or workmanship, defective materials, thermal movement, new structures settling, and in many North American policies earth movement unless a specific endorsement has been bought.
• Grey areas: leaking drains that softened the soil, nearby construction or excavation, tree roots, and damage to garden walls, paths and outbuildings, which may carry separate limits.

How a structural claim is investigated

After notification, the insurer typically appoints a loss adjuster or field adjuster, who may in turn instruct a structural engineer or a specialist subsidence management firm. The first visit records crack locations and widths, checks for distortion and looks at the surroundings: trees, drains, slopes, recent works and soil type.

If the cause is not obvious, the insurer may order investigations such as trial pits to inspect foundations, boreholes for soil samples, CCTV surveys of drains and tree root identification. Movement is often monitored for months with gauges or level surveys before any repair is agreed. This phase is where many policyholders feel the claim has stalled, so ask for a written plan with timescales.

Documents that strengthen your position

Evidence of when the damage first appeared is valuable, because insurers frequently argue that cracks are long-standing. Dated photos, decorating invoices showing walls were recently sound, survey reports from your purchase, and notes on when doors began to stick all help. Keep records of nearby works, burst pipes or storms, along with any correspondence with neighbours or councils about trees.

Typical points of conflict with the insurer

The biggest arguments are almost always about causation and scope. An insurer may accept that cracks exist but attribute them to settlement, poor construction or thermal movement, all usually excluded. Where cover is accepted, the debate moves to the repair method: the insurer may favour crack stitching and redecoration, while your engineer believes underpinning or drain replacement is needed to stop recurrence.

Other frequent friction points include the excess, which for subsidence is often much higher than for other perils, damage that predates the policy, the split of responsibility when you have changed insurer, and whether alternative accommodation is payable while major works are carried out.

Changing insurer mid-problem

Movement that starts under one policy and is discovered under another creates a handover problem. In the UK, insurers have long followed an industry agreement on subsidence claims when cover changes, but the details and current application should be checked with the insurers concerned. Elsewhere, the policy in force when damage first became apparent is commonly the reference point. Disclose known cracking when switching policies, because non-disclosure can undermine future claims.

The role of an expert working for the homeowner

A public adjuster or loss assessor acting for you does not replace an engineer, but coordinates the technical and contractual sides. They can commission an independent structural engineer, challenge an investigation that ignored a plausible insured cause, compare the proposed repair with what is needed for lasting reinstatement and price the full scope, including decorations, removal of fixtures and professional fees.

They also manage the timetable, pressing for monitoring results and decisions, and prepare the file if a formal complaint, appraisal process or ombudsman referral becomes necessary.

Signals that independent help is worth it

Consider bringing in your own expert if the insurer has declined on grounds of settlement or wear and tear but your own observations suggest recent movement, if the repair offered looks cosmetic, if investigations have dragged on without explanation, or if the property is a significant asset such as a rental block or listed building. On minor plaster cracks with a clear answer, the cost of an expert is rarely justified.

In structural claims, causation is the whole case: document early, ask for the reasoning behind any decision and challenge it with evidence. expertdassure.com suggests securing independent technical advice whenever the cause or the repair method is in doubt.