The Problem
As-built record assembly at closeout is expensive because it requires reconstructing a continuous history from point-in-time snapshots. Field markups made during construction reflect reality as the installer knew it that day. By the time those markups reach the drafting team at closeout, some have been lost, some are illegible, and some conflict with later revisions nobody marked up. The as-built drawings that result are often partial representations of reality rather than complete ones.
An Autodesk and FMI study found that poor project data and miscommunication drive 48 percent of rework on U.S. construction sites, with 22 percent attributable to poor data alone, generating $31.3 billion in annual rework costs in the U.S. A significant portion of that rework occurs on renovation and retrofit projects where the as-built drawings from the original construction are inaccurate or incomplete, and work performed against them reflects that inaccuracy.
On complex MEP packages, a single outdated or inaccurate drawing can trigger rework costs exceeding $500,000. (FMI research, cited by MSUITE) That figure reflects what happens downstream, on future projects, when the permanent record of installed systems isn't accurate.
A 2025 Qualis Flow report found that 95 percent of construction deliveries contain incomplete, inconsistent, or inaccurate documentation. As-built records are a primary contributor to that statistic. They are the documentation type most dependent on consistent field-to-office information flow throughout construction, and most vulnerable to the consequences when that flow breaks down.
The closeout timeline compound the assembly problem. Under the payment timeline pressure described in the previous article in this series, as-built completion competes with other closeout documentation for attention. What should be a continuous documentation discipline during construction becomes a sprint at the end of the project, when the field team has moved on and the information that should have been captured in real time has to be reconstructed.
What's Driving It
As-built problems are almost entirely a process design failure. The information required to produce accurate as-built drawings exists: in field markups, in installer knowledge, in the revision record. The problem is that there is no systematic mechanism for capturing it continuously and organizing it in a way that makes the final assembly straightforward.
When field markup collection depends on individual foremen remembering to submit updated drawings weekly, the collection is inconsistent. When revision tracking is managed across multiple paper sets and email attachments rather than a centralized drawing management system, the revision history is incomplete. When as-built update responsibility isn't assigned explicitly, it gets absorbed into whoever has time, which means it gets done last.
The downstream consequence, inaccurate permanent records for facilities that will be maintained and renovated for 30 or more years, is a liability that doesn't appear on the project P&L.
What Resolution Looks Like
A continuous as-built documentation workflow addresses the assembly problem by treating field markup collection as a scheduled, tracked activity throughout construction rather than a retroactive effort at closeout. Field changes are captured at the point of installation, organized against the current drawing set, and maintained in a central environment that reflects the building as built rather than as designed.
AI-assisted tools support this by tracking which drawing sections have received field updates, flagging sections where construction activity occurred without documented markups, and flagging conflicts between installer records and the current drawing set for engineer review. The drafting team still reviews and incorporates all markups. What changes is the completeness of the record they're working from at closeout.
QP's approach to as-built documentation workflows draws on a discipline where permanent records carry regulatory weight: where the standard for "complete and accurate" is defined by what the record needs to demonstrate years later, not by what was achievable under closeout pressure. That standard produces better records for MEP firms and better outcomes for the owners who depend on them.
For owners, accurate as-built drawings reduce the cost of every subsequent interaction with the building's MEP systems. For the MEP firm, providing accurate as-built records is both a quality differentiator and a legal protection. The firm that delivers a complete, accurate as-built package at closeout has fulfilled its documentation obligation. The firm that delivers an incomplete package has not, regardless of the quality of the installed work.
The Bottom Line
As-built records are permanent. The building will be maintained, renovated, and modified for decades. The accuracy of the record produced at the end of the original project determines the cost and accuracy of every project that follows.
The cost of maintaining accurate as-built records continuously throughout construction is lower than the cost of assembling them retroactively at closeout, and far lower than the rework cost generated when future projects proceed against inaccurate records.
Sources: Autodesk / FMI: poor data drives 22% of U.S. construction rework; $31.3B annual rework cost; FMI / MSUITE: inaccurate MEP drawings can trigger rework costs exceeding $500K per package; Qualis Flow 2025: 95% of construction deliveries contain incomplete or inaccurate documentation
If your as-built drawings are assembled at project closeout from field markups that may or may not have been maintained, the record you're delivering is less reliable than it should be.
Quantum Precision helps MEP firms build the field documentation workflows that make accurate as-built assembly a natural outcome of construction rather than a separate effort at the end.
See how as-built workflows are structured →