What does NEC4 clause 60.1(5) mean?

The clause protects you from people you do not control. It has three separate limbs. The first is not working within the times shown on the Accepted Programme. The second is not working within the conditions the Scope states. The third is doing work on the Site that the Scope does not mention. In the NEC4 main contract the people are the Client or Others. Others means anyone who is not a party, the Project Manager, the Supervisor, the Adjudicator, or one of your own suppliers or subcontractors. On a subcontract, read the Client as your main contractor. Others then includes its other trades, a utility company or the end client's own fit-out firm. The first limb needs an Accepted Programme showing when those others were to work. So your programme must plot their activities, not just yours. The second needs the Scope to state their conditions, such as working hours, sequence or areas. The third needs evidence of the work done, and that the Scope did not mention it. Notify under clause 61.3 within 8 weeks of becoming aware of the interference. 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 is most often disruption, return visits, protection and standing time. Two things go wrong most. The programme shows the others' work as a note, not as dated activities. Or the interference goes in the site diary but is not notified until the next application, by when the 8 weeks have gone. Any delay to the Completion Date is assessed separately under clause 63, and that is a job for your planner.