As-Built Versus Record Drawings: What Gets Documented Exactly?

As-built drawings are the contractor's field-marked record of what changed during construction; record drawings are the design team's finalized, verified set incorporating those changes — the authoritative document of the building as built. The process works best when it's continuous, not a closeout scramble. Good contractors redline as they go — the foreman marks the change the week it happens, not from memory six months later. The design team reviews the markups for completeness and incorporates them into the record set, clouding or otherwise identifying the changes. The final deliverable: a clean set, clearly labeled as record drawings with a date, that the owner can hand to the next team with confidence.

Beyond the updated plans, a complete record package includes the changes that matter most to future work: underground utility locations with dimensions to fixed references (the single most valuable as-built information on any site), concealed MEP routing above ceilings and in walls, structural modifications and field fixes, equipment schedules updated to the installed models and serial numbers, and control sequences as actually programmed rather than as originally specified. The systems that get the most future use from record documents are the concealed ones — underground, in-slab, and above-ceiling. What's visible can be surveyed later; what's buried can only be known from the record. I tell owners: if you pay for one thing at closeout, pay for accurate underground and concealed MEP as-builts.

Record documents don't happen by hope. They happen by contract:

• Require it in the contract: as-built maintenance as a condition of progress payments, not a punch-list afterthought
• Define the format: CAD, PDF, BIM — and the level of detail expected for each discipline
• Review monthly: spot-check redlines during construction — unmarked months mean unrecorded changes
• Tie it to closeout: final payment and retention release contingent on acceptable record documents
• Include O&M manuals: equipment cut sheets, warranties, and maintenance schedules alongside the drawings
• Plan the handover: a labeled, organized digital package — not a box of tubes or a corrupted flash drive