How does NEC4 clause 62 work?

Those are the periods in the NEC4 main contract, and your subcontract may set different ones. Clause 62 is the quotation stage, and it runs to a timetable either side can lose by ignoring. Under clause 62.2, a quotation sets out the proposed change to the Prices and any delay to the Completion Date and Key Dates. It shows how you worked them out. Where the programme is affected, it shows the changes to the Accepted Programme. You can also be asked to quote for other ways of dealing with the event. Under clause 62.3, you submit the quotation within 3 weeks of being asked, and the reply is due within 2 weeks of your submission. The reply accepts it, asks for a revised quotation, or says the other side will make its own assessment. Under clause 62.4, a request for a revised quotation must give reasons. Under clause 62.5, both periods can be extended if both sides agree before the period ends. Clause 62.6 deals with silence. If no reply comes in time, you can notify the failure. If there is still no reply within 2 weeks of that notice, the quotation is treated as accepted. The money is assessed on the clause 63 rules. So the quotation is a forecast of Defined Cost plus the Fee, not a claim built from invoices. The time element sits with the programme and your planner, not the QS. Three things go wrong. Quotations go in as a bare total with no details, which invites a request to revise. Extensions are asked for after the period has ended, when the clause no longer allows them. And subcontractors who get no reply wait instead of notifying the failure, so the quotation sits unpriced until the final account.