No, building bridges is a lot simpler because we have a set of coding practices to follow ( eurocode, ACI, British standards and whatnot). The performance of the buildings follow the deterministic Newton's laws, and you even have software packages written for that.

Your clients don't change the specs half way through and expect you to provide an accurate estimate and at the same time, don't intend to pay you extra. You can forecast the cost of building to a very accurate degree because all bridges are more of the same, unlike software which by definition,is new every time because each time the requirement is different.

And so on.

I know because I work in civil engineering software field.