When is the Employer's QS allowed to change his or her mind ?

Asked 3 months ago
2020-11-18 08:04:28

Under a traditional JCT Standard Form Building Contract can the Employer's Quantity Surveyor revise or update a previously agreed valuation assessment of a variation?
If assessment of a variation claim has been made and agreed between QS and Contractor during the course of the carrying out the work, is the QS empowered to change that assessment when calculating the Final Payment Certificate? Does it make any difference if previously agreed assessments are later found to contain clear and obvious errors or duplications with other areas of the account calculations?