As a GC specializing in energy service projects for small-to-medium size businesses, one of the first things we ask from a new client is that they provide us with a set of drawings for their building.  More often than not, they have no as-built drawings and, in many cases, they don’t even have the original permit set of drawings.  The AIA defines as-built drawings as the ones red-lined by the contractor to show changes from the original CDs.  I would like to see buildings keep drawings up-to-date with any changes made during or after construction, so that the current configuration of the building can be readily determined and avoid surprises during retrofit or renovation projects.  That means when an AC unit is replaced, for example, that the drawings be marked-up accordingly.  It’s much easier to maintain drawings provided with a new building, than to have to create as-builts for an existing building for which no drawings exist.  Most new buildings have stringent requirements for the project manual to be provided, yet I’ve been in buildings only a year or two old, and they can’t put their hands on any of the drawings.  As-builts can be prepared retroactively for existing buildings, but it’s expensive, often $2 per SF or more.  Memo to commercial building owners and operators:  keep those drawings current, it’ll save you a lot of time and money.