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I agree that preventing a problem is usually much cheaper than correcting it after construction has already started. A constructability review can reveal issues such as difficult installation sequences, limited access for equipment, conflicts between trades, or details that are technically possible but inefficient to build. These observations are especially valuable when they come from people with practical construction experience rather than being evaluated purely from a design perspective. The article at https://www.fields-builds.com/blog/cutting-costs-avoiding-delays-constructability-reviews explains this relationship well and shows why constructability should be considered before the project reaches the field.