Below shows some common contract types used in construction. It is also prudent to remember that the contract type is a base and most contracts has has its own unique complications to the type.
The Lump Sum Contract can sometimes be called 'Stipulated Sum' and is the most basic form of agreement where the contractor/supplier agrees a fixed lump sum price to undertake all the specified contract works and the employer agrees to pay this price upon completion of works.
The Schedule of Rates may be provided by the employer but quantities are usually binding upon the contract drawings and specifications. The SoR can be used for payment purposes and the rates used for assessments of design changes and additional work.
The Re-measurement Contract contains a Bill of Quantities ( BQ )provided by the employer or its consultants, however the BQ quantity is estimated and not final . The contractor will quote against each BQ item and enter a unit rate or unit price to build up the total contract price on basis of those BQ quantities .
During the construction period , the actual quantity of works executed under each BQ item will be jointly measured and valued at the quoted rate for interim payment purpose .
At completion of contract , the exact quantity of works finally executed under each BQ item will be again re-measured ( ie. the final measurement ) and valued at the quoted rate to evaluate the final account .
In case of instructed variation or additional works that are without basis of BQ rate(s) , the contractor can build up new rates or star rates for those works for valuation .
Arguably , this type of contract is more fair to both the client and the contractor because the final contact sum is based on a final re-measurement rather than being based on preliminary quantities set at tender.
This type of contract is sometimes known as “ Build , Own , Operate and Transfer ( BOOT ) contract ” . The client will layout a series of required end products with specification , terms and conditions ; and the contractor has to finance , design , construct , maintain , manage and operate the finished work for an agreed period say 10 years , 20 years or so .
During this agreed period , the contractor has the temporary ownership of these finished works and can charge the end users for recovery of its investment together with the expected profit . However when the agreed period expires , the finished work will have to be transferred back to the client in specified conditions .
This type of contract is sometimes known as “ package contract ” or “ turnkey contract ” or “ design and build contract ” and can be on lump sum basis or re-measurement basis .
The client or its engineer will set out the requirements in board or particular terms and invite the tenderers ( usually pre-qualified ) to submit a comprehensive proposal for the design and construction of the project .
This type of contract is usually for the maintenance or renovation work of a large sized project and the construction period usually ranges between 2 to 3 years or as otherwise agreed .
Usually a “ schedule of rates ” contains a comprehensive list of work items is already prepared to cover the employer’s proposed works but without specified quantities . The tenderers will be invited to quote their competitive rates against the work items in the schedule ; or sometimes to quote an addition / deduction percentages against the pre-determined rates entered by the employer or its engineer .
The employer will issue Works Orders to the contractor during the stated period for execution of any work items as required in anywhere within the project site . Payment for workdone will be based on the agreed schedule of rates . In case the executed work items are not covered under the agreed schedule of rates , a new rate or “ star rate ” will be built up and jointly agreed for payment purpose .
This type of contract is a short term contract and usually applies to some project which has an urgency to commence construction work . It includes a list of major work items with provisional quantities and invites the contractor to quote .
Following the award of the contract , the contractor will immediately commence preparatory work and detailed scope of works will be instructed from time to time until the whole design is completed . The works payment will be on the basis of the list of major work items , and will negotiate a relevant new rate for the missing work items .
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