As-built plans are the basis for every construction project – from renovation to conversion. However, these plans often do not correspond to reality. The result: planning errors, delays, and additional costs.
In this article, we’ll show you the most common sources of error in as-built plans – and how you can reliably avoid them with modern methods such as 3D laser scanning and digital inventory recording.
Common Sources of Error in As-built Plans
1. Outdated or Incorrect Measurement Methods
Many as-built plans are still based on tape measures, optical total stations, or old hand-drawn sketches. These often provide inaccurate or even incorrect measurements, which can lead to expensive rework during further planning.
2. Undocumented Conversions
Especially in older buildings, information on conversions or structural changes is often missing. Wall openings, relocated beams, or new installations are frequently not recorded – a high risk for everyone involved in the planning process.
3. Incorrect Digitization
In many cases, paper plans were converted to CAD without structural verification. Dimensional distortions, incorrect axes, or unverified grid data are the result.
4. Economic Consequences
Incorrect area information can directly lead to incorrect utility bills. Disputes between tenants, owners, and property managers are often the consequence. That’s why we at Shoai Architects offer precise area calculations according to DIN 277, GIF, and WoFIV standards – recognized by banks, courts, and real estate agents.
How do you identify plan deviations early on?
1. Control measurements at critical points
Load-bearing components, wall thicknesses, or ceiling openings should be specifically checked – these are often where the most significant deviations are hidden.
2. Logic check of the plans
Are room heights plausible? Do axis dimensions match? Do wall thicknesses match the construction method? Any abnormalities indicate inaccuracies.
3. Use of 3D laser scanning
The most precise method of as-built recording: 3D laser scanners provide a highly detailed point cloud from which precise digital as-built plans are created. This allows plan deviations to be reliably identified before they become a problem.
4. Use of digital building twins
With platforms like Ivion from NavVis, which we use at the Shoai architectural firm, all parties involved can work interactively in the digital model, take measurements, and manage documentation – ideal for renovation or maintenance measures.
Our solutions for more precise as-built plans
✅ 3D laser scanning and total stations
✅ Drone surveying for hard-to-reach areas
✅ CAD and BIM-based modeling
✅ Cloud-based data management for all project participants
Conclusion: Precision begins with as-built recording
Incorrect as-built plans are among the most common causes of planning problems, addenda, and cost increases in the construction industry. Using modern methods like 3D laser scanning, BIM integration, and digital tools like Ivion, we at Shoai Architects create a solid foundation for robust planning, reliable area calculations, and successful construction projects.
📩 Would you like to learn more about precise inventory management or have your plans reviewed?
Then feel free to contact us – we’ll provide you with a free, no-obligation consultation!
