How we can determine preliminaries amount to pay to the contractor when there is a concurrent delay from both parties, i.e. client/contractor?

Based on the contract agreement article of payment terms both parties must act to pay and receive the contract advance or work done  amount according to rules and procedures.  If there is a delay in one of the parties timely actions, then the contract agreement would be  base for claiming actions. Further if the reason for the delay is by the side of the contractor,  then the client must act based on the agreement and considering advantage of the Client, so as not to get loss.  And if the delay is by the side of the Client, then the contractor must act as per his agreement and must makes claims  for late payments.

Preliminary items can be group to different categories of initial ,final cost , time related charges, cost related charges or combination of types.

Proportion per month.

Dividing total preliminary by number of months in contract period, giving constant amount for inclusion in each valuation. But this does not take in to account if work may be behind program, which could result total preliminary  bring paid before complete.

Percentage of value.

Preliminary are expressed in % of contract sum to be added to  monthly value of contractor measured work.

In both this and previous method  prime cost or provisional sum in preliminary should be deducted before proportion.

Detailed breakdown.

This is best method having all details.

Example:

Supply and operations of track mounted crane.

This may cover

Base ( put down labour and material (initial cost)), take up and remove ( final cost))

Track (( laying ( initial cost), hire ( time related cost), remove ( final cost)).

Transport ( ( to site( initial cost), from site( final cost)).

Fuel cost electricity ( time related cost)

Operator ( time related cost)

Temporary electric supply ( bring in ( initial cost),remove ( final cost))

Preliminaries pay by work done percentage method. SO from there clien/contractor can be paid accordingly. Once the project is delay, the percentage of work done is low too.

Yeah, i understand now that when there is a concurrent delay, the delay is shared by the Contractor and the Employer. However, since the fact of the delay is established the Contractor is granted an Extension of Time. The Employer thereby forgoes his rights to claim penalty on the Contractor’s delay and the Contractor still have to similarly forego his rights for preliminaries and other costs.