What does NEC4 clause 60.1(2) mean?

In the NEC4 main contract it is the Client who must give access. On an NEC subcontract it is your main contractor. You must be given access to, and use of, each part of the Site by the later of two dates. One is the access date for that part in the Contract Data. The other is the date for access on the Accepted Programme, the programme your main contractor has accepted. The word later matters. If your own programme shows you needing an area after its access date, your main contractor is not late until the programme date passes. So programme access later than the Contract Data allows, and you push back your own claim. To prove the event, show which part of the Site is affected, its access date and the programme date as it stood. Then show the later of the two, and evidence you did not get access and use on that date. An area you can enter but not use still counts. Notify under clause 61.3 within 8 weeks of becoming aware, normally the day the date passes without access. The change to the Prices, your contract price, is assessed under clause 63.1. It is the effect on actual Defined Cost up to the notification and forecast Defined Cost after it, plus the Fee. That usually means standing people and equipment, remobilising and working out of sequence. Two things go wrong most. The Accepted Programme was never updated, so the date relied on comes from a programme nobody accepted. Or the event is notified when the cost is known, not when access was refused. Any delay to the Completion Date is assessed separately under clause 63, and that is a job for your planner.