The differences between Tender Sum & Sub Contract Sum

Dayaniddi is correct. The terms you need to look out for are "Lump sum" and "Re-measure".



A re-measure contract final account value is based on the quantity of works actually completed at the rates tendered. (Provided that the original BoQ was reasonably accurate in the anticipated quantities).



A lump sum contract final account value (in the absence of any variations) should be equal to the tender value. However if the contract is based on a BoQ provided by the Client and that BoQ is prooved to be inaccurate the Contractor is normally entitled to the recovery of the costs relating to errors/omissions contained in the BoQ.

Contract sum or subcontract sum can be measurable or remeasurable? for an example, if you have 40,000m2 area of painting works, you can clearly let this package as subcontract(lumpsum). In case, if you want to let for an example excavation works, the subcontractor will go for unit rate basis, upto 3m rate1, next level rate2(more than the previous one)where you anticipate the estimated quantities may change in actual execution. in that case, during tender stage you can mention that the subcontract is of remeasurable type, but you can fix the unit rate depends on varying depths. during execution you can re-measure the quantities by some means(no of trucks etc.,)and pay the money.