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問題 · 2026-05-21
Chiltern tunnel cost HS2 an extra £485–500 million versus the original scheme; broader final costs remain unresolved.
The Chiltern tunnel's direct additional cost relative to HS2's original proposed scheme is approximately £485–500 million [1]. This increase stemmed primarily from a 2015 decision to extend the tunnel northward by 2.6 kilometres, replacing open-cut sections to mitigate environmental and community concerns. The extension and associated scope changes were formally documented in Department for Transport assessments [1].
The tunnel's absolute final cost remains uncertain. While the C1 contract segment (which includes the tunnel) was valued at around £1.6 billion when awarded in 2017, no official final settlement figure for the tunnel alone has been published. Broader HS2 cost inflation—the overall project budget has risen to £87.7–102.7 billion as of 2026—reflects multiple compounding factors including design changes, geological challenges, inflation, and scope creep across the entire scheme, not the Chiltern tunnel alone [2].
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