An interactive analysis of what drives construction claims globally. Tile size represents how frequently each cause affects projects (as a percentage of all projects studied). Colour indicates the financial severity when that cause occurs, scored 1-10 where 1 (green) is low financial impact and 10 (red) is the most costly. Data synthesised from annual industry reports analysing over 2,200 projects in 114 countries with combined capital expenditure exceeding USD 2.4 trillion.
The treemap shows 40 causes of construction claims across 11 major categories. Each tile represents a distinct cause. The size of each tile is proportional to its frequency (the percentage of projects globally where that cause generated a claim). The colour of each tile represents its financial severity when it occurs, on a scale where green (1-2) indicates low financial impact, amber (5-6) indicates significant impact, and red (9-10) indicates the most costly disputes.
The most common causes (largest tiles) are scope changes (28%), incorrect design (22%), delay to completion (24%), and final account disputes (16%). The most financially severe causes include delay (scored 9), scope changes (scored 8), and design deficiencies (scored 8), reflecting the high cost of time-related and design-driven disputes.
Hover over any tile (or tap on mobile) to see the full assessment, including a plain-language rationale explaining why that score was given. The breakdown panels beneath the treemap show distributions by tier, category, and individual item.
Frequency percentages are measured independently per cause. A single project is typically affected by multiple causes simultaneously, so individual frequencies do not sum to 100%.
This analysis employs a structured heuristic evaluation framework combining four weighted dimensions: typical claim quantum as a percentage of contract value, consequential cost multiplier (the ratio of direct to indirect costs triggered by the cause), duration of resolution (how long claims of this type take to settle), and frequency of escalation to formal proceedings (adjudication, arbitration, litigation). Each cause was assessed against published industry data covering the period 2020-2025, with particular weight given to the most recent annual reporting cycles. The resulting composite Financial Severity Index is expressed on a normalised 1-10 scale.
Scope changes affected 28% of projects globally in the latest reporting period, down from over 36% five years ago. The decline suggests improved front-end definition on some projects, but the cause remains stubbornly dominant. On design-build and EPC contracts, scope changes are particularly contentious because the contractor has accepted design risk; any employer-directed change to the employer's requirements triggers re-design, re-pricing, and often re-programming. On traditional design-bid-build contracts, scope changes are more straightforwardly valued as variations, but the consequential delay and disruption effects remain difficult to quantify.
When design-related causes are aggregated (incorrect design at 22%, incomplete design at 19%, late design information at 15%, and coordination failures at 11%), design deficiencies collectively affect more projects than scope changes. The industry's reliance on incomplete design at tender stage is the root cause. Employers push to start construction before design is finalised to meet programme deadlines or funding milestones. Contractors accept design risk they cannot fully assess. The result is predictable: information arrives late, errors are discovered during construction, and coordination gaps emerge when it is most expensive to fix them.
Delay claims carry the highest financial severity of any category because time-related costs accrue daily. Global data shows contractors claimed time extensions averaging 49% of planned schedule duration, a figure that has improved (down from 71% in earlier periods) but remains substantial. Prolongation costs, comprising site establishment, supervision, plant hire, insurance, and financing charges, can reach 0.5-1% of contract value per month of delay. On a GBP 100 million project, that is GBP 500,000 to GBP 1 million per month. When delay is caused by multiple concurrent events (employer design changes, ground conditions, supply chain disruption), apportioning responsibility between the parties is the most technically demanding aspect of claims practice.
Payment disputes affect one in seven projects globally and have been increasing as economic conditions tighten. Late payment cascades through the supply chain: the employer pays the main contractor late, the main contractor pays subcontractors late, and subcontractors pay suppliers late. The Construction Act 1996 (UK) and similar legislation in other common-law jurisdictions exists because the construction industry's payment culture was, and in many respects remains, dysfunctional. The rise of smash-and-grab adjudications in the UK (63% of all adjudication claims per the 2024 survey) is a direct response to persistent non-compliance with payment notice requirements.
The most encouraging trend is the decline in the frequency of most causes over the past five years. Scope changes, design deficiencies, and contract administration failures have all reduced, suggesting that the industry is learning, albeit slowly. The less encouraging trend is that financial severity has not fallen at the same rate: disputes that do occur tend to be larger and more complex. The average sum in dispute (33.4% of contract value) remains stubbornly high. Cashflow and payment disputes have risen in relative ranking as other causes declined, and subcontractor insolvency risk has increased with elevated insolvency rates across the construction sector.