Blueprints to Reality: Decoding Construction
What the drawings mean, who is allowed to change them, and why the answer to the second question decides how your project goes.
Clients are usually shown drawings and almost never shown the information release schedule, which is a shame, because the schedule is the document that predicts how the job will go.
The drawings are a snapshot
A general arrangement drawing at tender stage is a statement of intent. It is accurate about what the building is and vague about how it is put together, because at that stage nobody has yet had the argument between the structural engineer and the services engineer about the third floor.
This is normal and not a problem. It becomes a problem when it is mistaken for a final answer and priced as one.
Four documents worth understanding
The information release schedule. Which drawing arrives when. If a package is due to be procured in March and its drawings are scheduled for April, you have found your first delay before anyone has spent a pound.
The RFI log. Questions from site that the drawings did not answer. A healthy log is busy early and quiet late. A log that is quiet early and busy late means problems are being discovered rather than anticipated.
The risk register. Every job has one; the useful ones name a person and a date against each entry rather than a probability score.
The temporary works register. The structures that hold up the building while it is being built. Almost invisible to clients and responsible for a disproportionate share of serious incidents.
Who can change a drawing
The single most useful question to ask at the first project meeting. The answer should be a named individual and a documented process, and it should be the same answer in month nine as in month one.
Where the answer is unclear, changes get made verbally on site, the model stops being the record, and eighteen months later nobody can say why a riser moved.
The point
Construction is not mysterious. It is a long sequence of decisions, most of them made early, recorded in documents that are available to you and rarely read. Ask for the schedule and the registers. They will tell you more than the renders.