The High Court in London heard an application from specialist insurance firm Hiscox, whose building adjoins the site in Bishopsgate.
Keltbray is currently carrying out demolition work on the site, ahead of an expected start on the substructure in the spring by Mace.
But this timetable could be hit if Hiscox’s claims that demolition work is too noisy are upheld. It has demanded “finite levels of vibration”. The hearing has been adjourned until 21 January.
The court agreed that the Pinnacle must guarantee access for Hiscox’s delivery vehicles. But it dismissed a claim that more needed to be done to prevent water getting into the Hiscox building.
It added that the current agreement between Hiscox and the Pinnacle would remain. This would see planning body, the City of London Corporation, called in to adjudicate if there is any vibration in excess of agreed “trigger levels”.
A Pinnacle spokesman said: “Hiscox want to make the current trigger levels into the absolute limits.
“If these limits were set, no one would be able to build anything in the centre of London. It would be a massive precedent."
Developer Arab Investments is hoping the Pinnacle, which will stand at 288 m, will be completed in 2011.
It will be the UK’s tallest building until the 310 metre Shard of Glass building at London Bridge is completed.