What we Found
- Waste from the typical construction site added 5% to the overall cost of the project (in terms of cleanup and haul-off) and a minimum of one month was added to the schedule just in performing cleanup.
- Closing down the home for large crews like painters, for instance, was extremely inefficient. Even working as fast as they could, it still caused a massive critical path in the project schedule that could not be moved or changed. Another disadvantage of large crews was the inefficiency of human movement and the re-work it often created. Think of a large grocery store packed with people. It is hard to be efficient when you are constantly moving around other people to get to what you need while also watching out for product displays and items which can easily be scratched or broken.
- Re-work is a significant problem on a construction job site, especially when many items on the job take 6-8 weeks to re-ship.
- Misplaced items are the cause of significant delays on a construction jobsite.
- Delayed shipments, products out of stock, broken or missing parts, or a miscalculation in material quantities are another cause of significant delays.
Builders tend to add contingency in the schedule for all of these delays. It can add up to 6 months to the schedule for these types of issues. For larger homes, those over 5,000 s.f., the problem is compounded, which is why you have seen some larger homes in the area under construction for up to two years or more.