A single company at the centre of the Grenfell inquiry is reportedly spending up to £50,000 a day on legal fees and related advice.
Overall, US-based cladding manufacturer Arconic is said to have spent some £30m on its case so far – including the public inquiry into the disaster and the criminal investigation.
By comparison, the Grenfell public inquiry has cost more than £40m as it moves into its second stage over the new year.
Due to start in January, that second stage – estimated to be at least as expensive as the first – will investigate decisions during the refurbishment of the tower.
Twenty construction, design and materials companies – each paying their own legal bills – have been granted core-participant status.
And each will have its own legal team present for much, if not all, of the 18 months of planned hearings.
The Royal Borough of Kensington and Chelsea, has already set aside more than £6m for legal costs.
By February this year the Home Office had already spent £2.1m .
London Fire Brigadehas paid around £2.8m.
Other contractors involved are reportedly still to declare their legal bills.