It&#x27;s tough to say for sure, it depends heavily on the project and the company and people building it.<p>My estimate though is that proper use of BIM (not just design &amp; engineering, but also accounting and time management... 5D) would save anywhere between 40-70% on their projects.<p>So, why isn&#x27;t it happening? Because the construction industry is always the last industry to adopt new technologies. &quot;If it ain&#x27;t broke, don&#x27;t fix it&quot; is the mentality. Also, if you&#x27;re 40-65 years old and been building forever, it&#x27;s not so fun to listen to 25-30 year olds tell you what&#x27;s what. But that&#x27;s what needs to happen.<p>The older guys in firms don&#x27;t listen (the ones that do save a bunch of money...), and so the young talented people leave for better industries like software engineering, where they are actually respected and valued.<p>We are started to see SOME private companies, like Suffolk, really adopting new stuff. The big guys like Turner and AECOM are trying to adopt, but like I said earlier, their technology infrastructure is a JOKE! Try writing BIM automation scripts when your network admin won&#x27;t even let you have root access. What a sad, sad joke it is.