THE Ministry of Defence wasted £1.35billion on bungled building projects for the Navy’s nuclear missiles.
Its mistakes caused delays of at least six years, said watchdog the National Audit Office.
And the MoD failed to share the cost with suppliers or learn from past problems, a report said.
The Navy’s Trident armed nuclear subs rely on a support network at key sites, which need to be regularly updated.
But “poor management” in the early stages of three construction projects allowed costs to soar and delays to set in.
The projects included a £1.8billion warhead assembly plant near Reading, Berks.
It is the only one of the three to be completed.
NAO head Gareth Davies said: “While these infrastructure projects are complex, the MoD has encountered similar challenges before in its nuclear work.
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“Although it has recently introduced changes to enhance its oversight of the projects and improve its contracts with suppliers, it should have learnt from past mistakes.
“Instead, the MoD’s failure to mitigate commercial and delivery risks early on has led to project delays and cost increases, as well as impacting its wider work.”
A MOD spokesperson said: “Nuclear infrastructure projects are often large and complex with niche designs.”