1. Fixing lump sum contract

Fixing lump sum contract means contracting the project at the agreed total price. It is characterized by defining the contract content and calculating the package price on the basis of drawings and engineering specifications, and it is guaranteed in one lump sum.

during the execution of the contract, unless the construction unit requests to change the original contract content, the contractor shall generally not request to change the package price. This method is relatively simple for the construction unit, so it is welcomed by the general construction unit.

For the contractor, if the design drawings and specifications are quite detailed, the cost can be estimated more accurately, and the contract is signed in a more comprehensive way, so that there is not too much risk, which is also a relatively simple contracting method.

if the drawings and specifications are not detailed enough, there are many unknowns, or unexpected circumstances such as sudden price increase of materials and bad weather occur, the contractor shall bear the risk of contingency; Therefore, unforeseen expenses are often increased, which is not conducive to reducing the cost, and ultimately is unfavorable to the contractor. This contracting method is usually only suitable for small-scale and technically uncomplicated projects.

2. The contract for pricing by quantity is based on the bill of quantities and the unit price table. Usually, the construction unit entrusts the design unit or professional estimator (cost engineer or surveyor) to put forward the bill of quantities, listing the partial quantities, such as several cubic meters of digging, several cubic meters of filling and tamping, several cubic meters of concrete, several square meters of wall plastering, etc., and the contractor will fill in the unit price and then calculate the total cost.

Because the engineering quantity is uniformly calculated, the contractor can get the total cost only by rechecking and filling in the appropriate unit price, with less risk; The contracting unit only needs to review whether the unit price is reasonable, which is convenient for both parties. At present, this contracting method is widely used in the world.

3. unit price contract

When the project needs to be started without detailed construction drawings, or some conditions of the project are not completely clear although there are construction drawings, it is not possible to calculate the engineering quantity more accurately, and it is necessary to avoid making the construction unit and the contractor take too much risks by luck. It is more appropriate to adopt unit price contract.

4. Cost plus fee contract

The basic feature of this contracting method is to determine the total project cost according to the actual cost of the project (including labor cost, material cost, construction machinery use fee, other direct costs, construction management fee and various independent fees, but excluding the total management fee and tax payable of the contracting enterprise), plus the agreed total management fee and profit.

this contracting method is mainly applicable to the situation that the contents of the project are not very clear before the start of construction, such as an emergency project that is designed and constructed at the same time, or a project that needs to be repaired after being damaged by disasters such as earthquake and war.

5. Contracts with remuneration calculated according to the total investment or contracted workload

This contracting method is mainly applicable to contracting business such as feasibility study, survey and design, procurement and supply of materials and equipment. That is to say, the design fee is calculated according to a certain percentage of the estimated investment, the survey fee is calculated according to a certain percentage of the completed survey workload, and the procurement contract business fee is calculated according to a certain percentage of the price of materials and equipment, etc., all of which should be clearly stipulated in the contract.

Baidu encyclopedia-project contracting