I was once working on a one off build and also on a smaller build at the same time. The smaller build was built start to finish as per the plans, the larger one was choices all the way.
replyThe net result, we topped out and roofed the big house, then built the small house in its entirety while the owners of the big house chose their windows. Add that in favour of waterfall design...
Not permitting and regulation? We're told that is the biggest impediment to development.
replyPermitting and regulation is generally a sub-component to each of the three things mentioned, and can be a major factor in schedule adherence for large scale construction projects. Whether that is the primary impediment or not is often a factor of the specifics of the project (and its design) and the overall environment. During major events (e.g. COVID), materials access and availability was a far more challenging aspect of schedule adherence for most large projects than any other factor.
replyI've never worked in this field as the GP, but I have family that do and I've heard plenty of stories and made my own observations, but definitely take my two cents with plenty of salt. Maybe GP will reply also.