{
  "query": "UK construction inflation trends May 2026 NEC4 contract cost escalation benchmarks",
  "claims": [
    {
      "claim": "As of September 2025, UK construction output price inflation was recorded at 2.7% year-on-year, which at that time exceeded input price inflation.",
      "verbatim_quote": "Output price inflation, running at 2.7% y/y in September 2025 (the latest available ONS data13 had, for the first time in several years, exceeded input price inflation, providing some relief to margins",
      "source_url": "https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-april-2026",
      "relevance": "high"
    },
    {
      "claim": "By February 2026, the effective borrowing rate for UK private non-financial corporations had fallen to approximately 5.66% from a 2024 peak.",
      "verbatim_quote": "the effective rate on new loans to UK private non-financial corporations had fallen from a 2024 peak of 7.26% to around 5.66% by February 2026",
      "source_url": "https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-april-2026",
      "relevance": "medium"
    },
    {
      "claim": "Under the NEC4 ECC contract, Secondary Option X1 is the specific mechanism used to manage inflation risk.",
      "verbatim_quote": "NEC4 ECC: Secondary option X1 – which must be selected in the contract data –provides a mechanism for the employer to agree to take on the risk of inflation.",
      "source_url": "https://gowlingwlg.com/en/insights-resources/articles/2026/war-supply-chain-disruption-and-inflation",
      "relevance": "high"
    },
    {
      "claim": "In NEC4 Option C (target cost) contracts, inflation-related cost overruns are managed via a pain/gain share mechanism.",
      "verbatim_quote": "Under NEC4 Option C (target cost), the cost saving or overrun is calculated and split between the parties through a \"pain/gain share\" mechanism",
      "source_url": "https://gowlingwlg.com/en/insights-resources/articles/2026/war-supply-chain-disruption-and-inflation",
      "relevance": "high"
    },
    {
      "claim": "UK construction cost inflation in early 2026 is expected to remain moderate due to soft demand, though pressures from labor shortages and commodity volatility persist.",
      "verbatim_quote": "Construction cost inflation is expected to remain moderate in the near term due to soft demand and competitive pressure across supply chains. However, rising commodity and energy prices, labour shortages, and increased infrastructure investment could create renewed inflationary pressure",
      "source_url": "https://www.arcadis.com/en-gb/insights/perspectives/europe/united-kingdom/uk-construction-market-view-spring-2026",
      "relevance": "high"
    },
    {
      "claim": "Historical data shows UK construction output price inflation peaked in mid-2022 at 12.1% for new work and 10.7% for the sector average.",
      "verbatim_quote": "ONS data shows that output price inflation in the sector peaked in mid-2022: in June, inflation for new construction work stood at a very high 12.1%. ... leading to average construction sector output inflation of 10.7%.",
      "source_url": "https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-december-2025",
      "relevance": "low"
    }
  ],
  "market_context": "- [HIGH] As of September 2025, UK construction output price inflation was recorded at 2.7% year-on-year, which at that time exceeded input price inflation. (source: https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-april-2026)\n- [MEDIUM] By February 2026, the effective borrowing rate for UK private non-financial corporations had fallen to approximately 5.66% from a 2024 peak. (source: https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-april-2026)\n- [HIGH] Under the NEC4 ECC contract, Secondary Option X1 is the specific mechanism used to manage inflation risk. (source: https://gowlingwlg.com/en/insights-resources/articles/2026/war-supply-chain-disruption-and-inflation)\n- [HIGH] In NEC4 Option C (target cost) contracts, inflation-related cost overruns are managed via a pain/gain share mechanism. (source: https://gowlingwlg.com/en/insights-resources/articles/2026/war-supply-chain-disruption-and-inflation)\n- [HIGH] UK construction cost inflation in early 2026 is expected to remain moderate due to soft demand, though pressures from labor shortages and commodity volatility persist. (source: https://www.arcadis.com/en-gb/insights/perspectives/europe/united-kingdom/uk-construction-market-view-spring-2026)\n- [LOW] Historical data shows UK construction output price inflation peaked in mid-2022 at 12.1% for new work and 10.7% for the sector average. (source: https://www.tmhcc.com/en/news-and-articles/thought-leadership/uk-construction-sector-report-december-2025)"
}