Can AR in Civil Engineering Reduce Costs? The Economic Effects of Efficiency Gains

Table of Contents

• Introduction

• What Is AR Civil Engineering?

• Key Points of Operational Efficiency Using AR

• Cost Reduction Effects Brought by AR Implementation

• Use Cases of AR in Civil Engineering

• Challenges and Countermeasures for AR Adoption

• Introduction to Simple Surveying with LRTK

• Conclusion

• FAQ

Introduction

In recent years, the construction and civil engineering industries have been paying increasing attention to AR (Augmented Reality) technology. The ability to hold up a smartphone or tablet on site and overlay design drawings or 3D models onto the real scenery is revolutionizing construction management and surveying. In Japan, digital technology adoption is being promoted through initiatives such as the Ministry of Land, Infrastructure, Transport and Tourism-led *i-Construction*, and AR is expected as a means to address issues like labor shortages and the aging of skilled technicians. With the serious personnel shortage problem known as the "2025 cliff" approaching, improving operational efficiency and productivity through AR has become a concern for the entire industry.

This article answers the question, "Can AR in civil engineering reduce costs?" by explaining in detail the concrete benefits of operational efficiency using AR and the resulting economic effects. By understanding how AR technology reduces costs on site, we hope this will help inform cost-effectiveness assessments and investment decisions for construction projects.

What Is AR Civil Engineering?

"AR civil engineering" refers to the use of AR technology at civil engineering and infrastructure construction sites. AR (Augmented Reality) is a technology that overlays digital information onto the real-world view. For example, you can display a model of the finished structure or design drawings over the site as viewed through a tablet's camera. Where previously one had to imagine the finished image or discrepancies from 2D drawings or photos, AR enables intuitive, on-the-spot confirmation.

Using AR in civil engineering allows on-site comparison of actual objects with design data. This produces various benefits such as preventing construction errors, smoothing communication, and improving progress management efficiency. As the saying goes, "seeing is believing": information that was hard to convey with words or drawings can be shared visually, making it easier to align understanding among all site stakeholders.

So, specifically, which site tasks become more efficient when AR is introduced, and how much cost reduction does that lead to? From the next chapter, we will examine the key points of AR utilization and its economic effects step by step.

Key Points of Operational Efficiency Using AR

Incorporating AR into civil engineering sites can be expected to produce various efficiency effects in daily construction management and surveying tasks. The main points are summarized below.

• Labor-saving in surveying and measurement work: Tasks that used to require several people and a lot of time, such as surveying and as-built measurement, can be performed as "simple surveying" with just a smartphone using AR-enabled apps. For example, a major general contractor developed a smartphone AR app that allows a single person to measure earthwork volumes and terrain without dedicated equipment. Height differences and excavation volumes can be visualized instantly on AR, dramatically reducing the time and manpower required for surveying.

• Visualized progress management: By simply holding a device on site, you can overlay the finished model and schedule information in place. This makes discrepancies between current progress and the plan obvious at a glance, enabling immediate schedule reviews or personnel adjustments as needed. Real-time visualization of progress reduces set-up losses and contributes to shorter construction periods.

• Error prevention and quality assurance: By superimposing 3D design data of the construction target over the actual object via AR, positional offsets and dimensional errors can be detected and corrected on the spot. For example, in piping work, displaying pipe installation positions in AR and comparing them with actual on-site positions allows correction of millimeter-level deviations that would be invisible after burial, preventing rework and avoiding material waste and quality defects.

• Remote communication and technical support: Sharing on-site video via AR glasses or tablets makes it easy for experts in remote locations to provide real-time instructions and support. This reduces travel time and business trip costs while enabling quick, accurate decisions without senior technicians physically visiting the site. Sharing veteran know-how through AR also aids in training younger workers.

• Improved coordination and information sharing: Displaying the next construction steps or the expected finished appearance in AR helps workers share a common image of the outcome and cooperate smoothly. This reduces communication omissions and misunderstandings and improves overall team efficiency. Showing clients or nearby residents the completed image via on-site AR can also facilitate smoother consensus building and communication.

Through AR adoption, various on-site processes can eliminate unnecessary effort, allowing high productivity to be maintained even with fewer people. Especially for less experienced staff, AR's visual guidance helps them grasp key points easily, contributing not only to labor savings but also to more efficient human resource development.

Cost Reduction Effects Brought by AR Implementation

Now, let's look at how the above operational efficiencies translate into concrete cost reductions. The key is eliminating waste through time savings and error reduction.

First, reduced working time directly cuts labor costs. For example, there are site reports stating that AR halved the time required for surveying tasks. As a result, work that used to take two people half a day can now be completed by one person in a few hours, reducing labor expenses accordingly. Similarly, by always grasping progress with AR, waiting times can be reduced and duplicate work prevented, and overall shortening of the construction period can suppress extra daily wages and indirect costs (site maintenance expenses, etc.).

Next, reducing construction errors and rework produces significant economic effects. Rework or additional corrections at the site increase costs for materials, equipment, and labor. If AR allows early detection and correction of mistakes during construction, high-cost rework discovered after completion can be avoided. For instance, one construction company reported that after introducing an AR system, rework due to misreading drawings drastically decreased, resulting in major reductions in complaint handling and additional construction costs.

Also noteworthy is cost compression through effective use of design data. In an overseas example, directly displaying BIM and other 3D design data on site with AR eliminated the need to convert to 2D drawings, cutting waste equivalent to 7–11% of the project budget. Creating 2D drawings from 3D models traditionally required time and manpower and introduced loss of design information. By omitting such intermediate processes through AR, consistent data utilization from design to construction becomes possible, achieving large efficiency gains and cost reductions.

Furthermore, cost savings from reduced travel due to remote support is another economic benefit. If experts or supervisors do not need to visit every site and can check conditions and give instructions via AR, travel expenses and time-related labor costs are saved. This is particularly advantageous for managers handling multiple sites.

As described above, efficiencies achieved by AR implementation bring cost merits across many aspects: reduced labor costs, prevention of wasteful costs from errors, and elimination of auxiliary tasks. Even on small sites, incremental daily savings can add up to a significant return on investment over the long term. In practice, there have been reports such as "fewer re-inspections shortened the construction period" and "site management can be handled with fewer people," making AR notable as a countermeasure to chronic labor shortages.

Use Cases of AR in Civil Engineering

AR technology is already being used across various civil engineering and construction scenarios. Here we present example images from the perspectives of error reduction at construction sites, safety improvement in infrastructure maintenance, and survey work efficiency.

● Error reduction at construction sites (general contractor implementation example) Some major construction companies were early to adopt AR for managing equipment piping works. They built a system that overlays 3D models from design drawings onto live site video on a tablet, enabling real-time verification of drawing information against the actual object. Tasks that used to require comparing paper drawings with the site for pipe location checks have become intuitive and reliable with AR, significantly reducing verification work. Because omissions in drawings leading to construction errors can be detected and corrected on site, the occurrence of rework has been curbed. After introducing the AR app, conflicts between temporary structures and permanent structures were resolved one after another, leading to reduced additional work and complaints and, consequently, shortened construction periods. Even small and medium-sized civil engineering firms can utilize AR with just a tablet, enabling site supervisors and craftsmen alike to share design intent on the spot and work without errors.

● Improved safety in infrastructure maintenance (road and rail examples) AR is also being applied to infrastructure inspection and maintenance such as highways and railways. For inspecting aged tunnels and bridges, it is necessary to accurately identify deteriorated areas by comparing drawings and past records with current site conditions. With AR, inspectors can overlay repair histories and design drawings onto the live site view via a smartphone to check information on the spot. Services that visualize routes of underground pipes and cables in AR have also emerged, reducing the risk of damaging buried utilities during excavation. One infrastructure management company reported that AR visualization of underground pipelines greatly reduced near-miss incidents during excavation. There are also initiatives to display maintenance procedures as AR manuals to guide workers in real time on disassembly steps and inspection points. For example, in vehicle maintenance, highlighting bolts that must not be left loose in AR helps prevent human error and ensures reliable maintenance checks.

● Survey work efficiency (integration with ICT construction and CIM examples) For surveyors and site management engineers, AR is becoming a powerful support tool. Traditionally, confirming that as-built conditions match designs required measuring positions and heights with total stations and comparing them to drawings, which was time-consuming. With AR technology, the 3D model used in design (BIM/CIM data) can be overlaid on the site video to detect discrepancies between as-built conditions and the design at a glance. For example, overlaying a design model on a structure under construction in AR can immediately reveal errors such as "this height is a few cm (a few in) higher than the design" or "this wall position is slightly to the left of the drawing." Detecting such deviations before concrete placement allows correction instructions to be issued, resulting in more accurate construction. AR is also changing how surveying itself is done. AR measurement technologies have emerged that let you place a virtual surveying rod in the screen to capture cross-section shapes, eliminating the cumbersome work of recording measurement points in field notebooks and later drafting drawings. These technologies enable automatic generation of survey drawings and smooth data linkage between site and office, dramatically improving surveying efficiency.

From these examples, it is clear that AR in civil engineering delivers multifaceted effects such as reduction of construction errors, improved safety, and work efficiency gains. Regardless of site type or scale, there is growing room to apply AR to various processes with ingenuity.

Challenges and Countermeasures for AR Adoption

AR technology is very useful, but several challenges have been pointed out when actually using it on site. For example, concerns include "how to align digital models with the real object on site" and "whether expensive dedicated equipment is required." Traditional AR systems sometimes required placing markers at each site or setting reference points for initial calibration, making introduction cumbersome. Also, preparing 3D models and drawing data for AR display and training on-site staff can make the barrier to operation seem high.

However, in recent years, user-friendly AR solutions have begun to appear that overcome these challenges. By combining smartphones and tablets with cloud services, AR can be made easy to use on site even without specialized skills. In the next chapter, we introduce how our company’s latest solution, "LRTK," lowers the hurdles for AR adoption.

Introduction to Simple Surveying with LRTK

Our company offers "LRTK" as a solution that allows anyone on site to perform high-precision positioning and AR surveying easily. LRTK equips a smartphone or tablet with a compact high-precision GNSS antenna and connects to the cloud to achieve cm-level positioning accuracy (cm level accuracy; half-inch accuracy) in the field. This automates and simplifies the previously difficult task of precise alignment for accurate AR display.

Specifically, by using LRTK, you can always know the device position with high accuracy through satellite positioning (RTK-GNSS), eliminating the need to place markers for each site or perform complicated initial calibrations. For example, if you upload design drawings or BIM model data in advance to LRTK's cloud system, on site you only need to hold up your smartphone to display the model at full scale and at the correct coordinates in AR. Intuitive to use without specialized surveying skills, LRTK makes it easy for each person with a smartphone to handle everything from simple surveying to AR-based as-built checks.

LRTK is already being used on many civil engineering and construction sites and has received high praise such as "dramatically shortened surveying time" and "smoother data sharing between site and office." It is a modern AR-enabled positioning tool compatible with the Ministry of Land, Infrastructure, Transport and Tourism's construction DX initiatives and will be a powerful partner for accurate and efficient construction management even with a small crew. If you are interested in improving on-site operations with AR technology or in simple surveying, please take a look at LRTK's detailed information and consider bringing a new "visualization" experience to your site.

Conclusion

The introduction of AR technology to civil engineering sites is strongly driving digital transformation (DX) of on-site operations. By fusing on-site conditions and design information in real time with AR, intuitive and accurate progress management and high-quality construction without errors have become possible. As seen in the cases covered in this article, concrete effects have already been reported in many sites, such as remote support, heavy equipment operation assistance, and labor-saving of surveying and inspection processes.

On the other hand, adopting new technology requires data preparation, setup, and training, but recently smartphone × cloud AR solutions that are easy to use have emerged, steadily lowering the barriers. Introducing AR to your construction sites has sufficient potential to complement labor shortages, improve work efficiency, and ensure quality.

Please consider the content and examples in this article to examine whether there are issues in your sites that "AR can solve." Starting AR utilization from small initiatives can be the trigger to raise your site's productivity and quality control to the next level. Finally, we introduced tools such as our company's LRTK as one example of a new AR-based construction management method. By adopting appropriate solutions, you can maximize the benefits of efficiency and quality improvement. Harness cutting-edge technology to bring new innovation to civil construction management sites.

FAQ

Q: What equipment and preparations are needed to use AR at construction sites? A: Basically, you can start with just one AR-capable device such as a smartphone or tablet. By preparing a dedicated AR app or cloud service and loading data such as construction drawings or 3D models, you can overlay digital information on site. If you want more accurate alignment, it is advisable to combine high-precision GPS receivers attachable to tablets or AR glasses. However, in many cases you can try AR sufficiently with common mobile devices first, making it easy to consider adoption.

Q: Does AR implementation cost money? What is the cost-effectiveness? A: Implementation costs vary by case, but recently it has become possible to start at relatively low cost using smartphone apps and cloud services. Even when procuring dedicated equipment, the financial burden has been reduced compared with traditional large surveying instruments or VR systems. More importantly, reported benefits of AR include "surveying time halved" and "fewer re-inspections shortened construction periods," so the cost merits from reduced labor and error prevention are very large. AR tends to be effective even on small sites, so overall it can be considered a highly cost-effective measure.

Q: Does using AR help improve on-site safety? A: Yes, AR is effective for safety management as well. For example, AR can visualize danger zones or no-entry areas to warn workers, and AR displays can supplement heavy equipment blind spots, contributing to accident prevention. Displaying work procedures in AR can also reduce human errors and mistakes from misunderstandings. In safety training, AR simulations can provide pseudo-experiences of working at heights to enhance hazard prediction drills. Thus, AR adoption contributes not only to efficiency and quality but also to improved safety.

Q: What is the difference between VR (virtual reality) and AR, and which is more suitable for construction? A: VR (Virtual Reality) involves wearing a headset and entering a completely virtual space. AR overlays digital information onto the real world so you can see real site conditions and digital data at the same time. For construction management and situations where on-site verification and work are required, AR is often more suitable because it allows direct checking of progress and discrepancies with design on site, directly aiding daily management and error prevention. VR, on the other hand, is used for simulated experiences of the finished project or for pre-simulation of construction procedures. Both technologies are used according to purpose, but for on-site work support, AR tends to take the leading role.