Having read a lot, and listened to podcasts, about BER, the takeaway seems to be that quality control is of utmost importance. The amount of money you spend on quality control almost can't be high enough. 30% or more of the budget just for quality control now seems entirely reasonable to me. And it can't be just at the end, it has to be an ongoing thing where everything is sanity checked as it is being done by people who preferably know their shit better than the people actually doing the work. Starting with the fundamental assumptions of the architectural drawings and ending with the carpets. Because we see the alternative and it's just depressing how far over budget things can go.