Information a contractor can price and build from, without a fortnight of requests for information first.
That it can be priced accurately and built without interpretation. A package that leaves questions open transfers risk to the contractor, who prices the risk, and the client pays for it in the tender return before a brick is laid.
Details, schedules and specification are produced as one coordinated set for that reason.
Against the structural and services information rather than alongside it. A clash found in a drawing costs an afternoon; the same clash found on site costs a variation and a delay, and it is always found eventually.
Queries arrive on every project. Answering them quickly, and recording the answer in the drawings, is what keeps a programme intact — and it is the point at which most of a consultant's value is either delivered or lost.
Describe what you have in mind and we will say plainly whether this is the right service for it, and what it would involve.