Which is more expensive, civil engineering or installation?

Generally, in a project, the civil engineering cost is large and the installation cost is small. However, again, the calculation of civil engineering is much larger than that of installation, and you pay more cost and time. At present, there are too many civil works, the installation is scarce, it is easy to take over, and the benefit is not worse than that of civil works. It is recommended to install and hope to adopt it.