In the modern construction industry, alongside the physical facility, the digital database encompassing the building’s entire lifecycle represents increasing value. While the primary goal during construction is to build as accurately and efficiently as possible, for long-term value creation, what matters is how the property can be operated, maintained, and further developed.
The foundation of this digital informational background is the BIM-based as-built model, which maps every physical element of the building in precise detail. However, this model is not the same as the structured and enriched mass of data a facility manager works with day in and day out—the latter is the operational BIM model.
Although many treat them as one and the same, the two differ significantly in their function, level of detail, data content, and user base. And yet: one cannot exist without the other.
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What is the Difference Between the Two Models?
The as-built model is a digital representation reflecting the physical reality of the building. It contains modifications made during construction, the installed materials and systems, and their exact locations.
The operational model, on the other hand, is a BIM model designed to manage the facility’s entire lifecycle. The focus is no longer on “what was built,” but rather: how do we operate it, how do we maintain it, how do we reduce operating costs, how do we respond to faults, and how do we document these processes?
Both are indispensable—but they serve distinct functions within digital workflows.
1. What is an As-Built BIM Model?
The as-built model is a post-construction snapshot—a detailed, digitally structured imprint of the actual built state. It is not merely an updated plan, but a comprehensive, geometrically and technologically precise BIM model that records what was built, how it was built, and exactly where it is located.
What Does it Contain?
- True geometric layout: The exact positions of walls, slabs, substructures, and MEP (Mechanical, Electrical, and Plumbing) routing.
- Structural and technical elements: Types of installed materials, manufacturers, part numbers, and installation dates.
- Project-specific documents: Permits, declarations of conformity, performance certificates, and maintenance manuals.
- A record of clashes, on-site alterations, and other construction deviations compared to the original plans.
How is it Created?
- If construction was managed in BIM, the as-built model is updated step-by-step throughout the execution phase.
- If BIM was not used from the start, then:
- We create a point cloud using laser scanning (LIDAR).
- We digitize 2D documentation and convert it into BIM.
- We supplement missing data using other photo-based data collection methods and on-site surveys.
What is it Used For?
- As part of the handover documentation.
- As the foundation for legal and warranty tracing.
- As a preparatory platform for maintenance and operational data.
However, on its own, it is not sufficient for facility management. This is where the second model comes into play.
2. What is an Operational BIM Model?
The operational model is an advanced, purposefully enriched version of the as-built model, containing the structured information necessary for the facility’s daily operation, maintenance, and future development.
Additional Data It Contains:
- Maintenance cycles: (e.g., specifying when to inspect, replace, or repair specific items).
- Condition data of mechanical, electrical, and other facility systems.
- Warranty periods and guarantee information.
- Asset-level tracking: Systems identified with QR codes, RFID tags, or IoT sensors.
- Digital connectivity with CMMS/CAFM/FM (Computerized Maintenance Management System / Computer-Aided Facility Management) systems.
The Main Goal:
- Proactive and predictive facility management.
- Optimization of energy consumption.
- Automatic and rapid fault resolution.
- Data-driven decision-making throughout the entire lifecycle.
A well-structured operational model can reduce facility management costs by up to 20–30% and dramatically increases total transparency.
3. Main Differences
| Aspect | As-Built BIM Model | Operational BIM Model |
| Purpose | Recording changes made during construction | Supporting the operation and use of the building |
| Content | Geometry, materials, technical data, documentation | Maintenance, lifecycle, asset-level data, services |
| Level of Information (LOI) | Technical and manufacturer data | Usage, operational, service provider, and lifespan information |
| Users | Designers, contractors, investors | Facility operators, Facility Managers (FM), maintenance personnel |
| Lifespan | Until handover; serves as part of the final documentation | A continuous database utilized throughout the building’s entire lifecycle |
4. Why Are Both Necessary—and How Do They Build on Each Other?
The as-built BIM model is the foundation of the operational model—without it, we cannot speak of true, long-term, data-driven facility management. This model documents the physical reality, the geometric layout, and the actually installed materials and systems of the building, acting as a kind of digital “final snapshot” of the construction phase. However, on its own, it is not sufficient for operation because it does not contain all the information required for the daily running of a building.
For an as-built model to become an operational model, its content must be supplemented with data relevant to facility management and maintenance. This process can only be efficient and seamless if, right from the start of the project—during the design phase—we define what information needs to be collected and in what format it should be structured. The framework for this is provided by the EIR (Exchange Information Requirements) document, which records the investor’s expectations regarding the model’s content.
During construction, data collection takes place in real time according to these requirements: for example, through QR-code asset registration, digital software usage, or sensor data input. Thus, physical and digital processes progress in parallel, and the model is continuously updated.
Upon project closure, all collected data is handed over in a structured, FM-compatible (Facility Management) format that can be directly integrated into facility management systems. Consequently, the investor receives not just documentation, but an actively usable digital tool that supports operation, maintenance, and cost-effective facility management throughout the building’s entire lifecycle.
5. Common Mistakes—What to Avoid
When building the connection between BIM-based as-built and operational models, several flawed practices can occur that later lead to severe information gaps, unnecessary extra costs, and longer operational turnaround times. These mistakes are mostly not technological, but stem from shortcomings in process management—often tracing back to poorly defined expectations, bad timing, or inadequate information management.
- Producing Data-Deficient Models: This is one of the most common mistakes. It means that although the contractor creates an as-built BIM model, it only contains geometric layouts and architectural structures, but lacks the fundamental technical, manufacturer, maintenance, or operational data required for FM systems to function. In such cases, the model starts “blind” from a facility management perspective—FM professionals will not know, for example, when a boiler’s warranty expires, how often a filter needs to be cleaned, or which service provider handles a specific installed asset.
- Using a Non-FM-Compatible Data Structure: A model might contain detailed data, but if it is not placed in the correct fields, recorded in the right format, or fails to meet the requirements of FM software (e.g., IFC, COBie, Excel import/export structures), the data cannot be automatically transferred to the operational system. This later requires lengthy manual conversions, which are not only time-consuming but also highly prone to error. An intelligent asset registry or automated maintenance schedule cannot be generated from a poorly structured model.
- Bringing FM Experts in Too Late: Operational considerations cannot be retrofitted into a model at the last minute, during the week of handover. The development of the model and the design of the data structure must begin during the design phase: it must be precisely defined what information each element should carry, where it will be stored, and how it will be transferred to operational systems. If FM requirements are brought to the table late, the existing model can no longer accommodate them in a structured way, requiring remodeling or expansion—which is both time-consuming and expensive.
- The Lack of Transition Between BIM and FM: Last but not least, one of the gravest mistakes is failing to establish a proper handover process. If, upon project closure, there is no FM data package or software integration, the BIM model “stops” at the as-built level. In this case, the digital twin that would enable real-time, data-driven operation is never created. The result: the investor receives a model, but it is never put to actual use because there is no data flow between construction and operation, no regular updates, and no usable connection to daily operations.
6. What Process is Needed to Connect the Two Models?
This is not a simple “push-button” export. Rather, it is a carefully constructed data enrichment and integration process that includes:
- Structuring data fields according to FM requirements.
- Preparing software integration (e.g., IFC, COBie, APIs).
- BIM auditing and strict quality control.
- Training and support on the operator/facility management side.
AFMTEC accompanies your projects through this entire journey—delivering not just models, but a fully functional, usable system tailored for your operational success.
