建筑安装工程合同,是业主与承包商之间的经济契约,是维护双方经济权益的法定文件,双方都要恪守履行。但是,再完善详尽的勘测设计和标书,在合同实施过程中,也会发生这样或那样的变更。如工程分项的增减、技术要求的修改、施工条件的改变等。这就涉及到如何计算费用问题;大的变更则涉及到工期的调整。如何合理计算合同变更费用?各单位各工 The construction and installation project contract is an economic contract between the owner and the contractor. It is a statutory document for safeguarding the economic rights and interests of both parties, and both parties must abide by it. However, the detailed survey and design and bidding documents will be further improved. During the implementation of the contract, one or more changes will also occur. Such as the increase or decrease of sub-items, the revision of technical requirements, the change of construction conditions, etc. This involves how to calculate the cost; large changes involve the adjustment of the schedule. How to reasonably calculate contract change fees?