Reducing Waste on Construction Sites! Five Methods to Achieve Efficiency [Definitive Site Improvement Guide]

In the construction industry, chronic labor shortages and tight schedules make improving onsite productivity a critical challenge. To reduce waste on construction sites and improve efficiency, it is essential to rethink traditional practices and actively adopt digital technologies and new methods. *i-Construction*, promoted by the Ministry of Land, Infrastructure, Transport and Tourism, sets a target of "improving construction site productivity by 20% by 2025," so there is no time to waste on site DX-driven efficiency. This article introduces five concrete measures for site efficiency that can serve executives, site supervisors, and DX promoters at construction companies. It explains challenges and improvement methods in surveying, schedule management, drawing digitization, information sharing, and safety management, organized in the flow of "Challenge → Improvement Approach → Implementation Points → Expected Effects." Use these ideas as hints for improving your own sites.

1. Streamlining Survey Work: Reducing Manpower with Drones and Smartphones

Challenge

Surveying is indispensable in civil engineering and construction, but traditionally it required several experienced surveyors to visit the site and measure many points using total stations and levels. On large sites or uneven terrain, surveying could take many days, becoming a bottleneck that prevents other work from progressing. Surveying in high places or on steep slopes is also dangerous, and in times of labor shortages it is difficult to allocate personnel. The inefficiency of the surveying process affects overall site progress and leads to significant waste and cost increases.

Improvement Approach

Using ICT technologies to reduce labor is effective for streamlining surveying. Specifically, automated aerial surveys with drones and one-person surveys using LiDAR-equipped smartphones are notable examples. Drone surveying can quickly capture the entire site from above, and photogrammetry software or laser scanners can generate detailed terrain data. Cliffs and hazardous areas that were previously inaccessible can now be assessed without humans entering them, contributing to improved safety. Recently, smartphone surveying technology that attaches small RTK-GNSS-capable devices to phones for high-precision positioning has emerged. This enables a single surveyor to perform site layout and as-built measurements, eliminating the need for the multi-person teams of the past. Leveraging these latest technologies can dramatically improve the efficiency of surveying work.

Implementation Points

When introducing drone surveying, first select the appropriate method (photogrammetry vs. laser scanning) and equipment based on the purpose. For example, use laser-equipped drones for large-scale land development and photogrammetry for high-detail structural surveys. Also, drone operation requires compliance with rules such as obtaining certifications and flight permissions, so set up the necessary structure in advance. When introducing new smartphone-based surveying devices, provide training for site staff and run pilot implementations to create on-site manuals tailored to each location. The key is to balance ease of use so anyone can operate it with ensuring measurement data accuracy. While initial investment and internal resistance are possible, start by trialing the technology on a single site to verify its effectiveness and then expand gradually.

Expected Effects

Digitalizing and reducing labor in surveying delivers tremendous benefits. First, work time is greatly reduced. For example, a survey of a 2-hectare site that used to take 2–3 days reportedly completed in about half a day (actual flight time around an hour) with a drone—roughly a one-sixth time reduction. Similarly, a river survey that used to take five days was completed in one day using drones. Next, there is significant reduction in personnel and improved safety. Tasks that previously tied up several surveyors can be done by one person with ICT surveying, freeing staff for other tasks. Surveys in high or hazardous locations can be replaced by drones or remote measurements, reducing worker risk. The data obtained are often high-density 3D point clouds, enabling precise as-built checks and more accurate responses to design changes in later stages, which helps reduce rework and further improves efficiency.

2. Streamlining Progress and Schedule Management: Construction Management Through "Visualization"

Challenge

Schedule management is essential for smooth execution of construction projects, but traditional progress management often relies on the individual methods of each site supervisor. Many sites still manage work plans with paper schedules or whiteboards, requiring site visits or waiting for daily reports to learn the latest progress. When managing multiple projects or remote sites, real-time information sharing becomes difficult, increasing the risk of delayed detection and response to problems. The longer progress delays go unnoticed, the more pressure is shifted to later stages, causing overtime and additional costs—waste that could have been avoided. Inefficient progress management can lead to schedule delays and serious risks such as complaints.

Improvement Approach

Efficient schedule management requires "visualization" of progress. Recently, construction management apps and cloud services have become popular, allowing real-time sharing and confirmation of progress. For example, create and update Gantt charts (schedules) on PCs or tablets and store them in the cloud so all stakeholders can access them. If plans change at the site, update the schedule from a smartphone and notify everyone immediately, ensuring the latest information is always shared. Additionally, being able to view the entire project at a glance, including headquarters and other sites, makes it easier to reallocate resources (workers and heavy equipment) at the right time. In short, preparing an environment where everyone cooperates while viewing the same up-to-date information using digital tools leads to more efficient progress management.

Implementation Points

When introducing a progress management tool, choose a system that fits site conditions and consider the IT literacy of onsite staff. Overly feature-rich systems can be complex and may not be adopted, so select a simple, intuitive service. During the early stages of adoption, provide careful explanations and support for site supervisors and foremen. For staff used to paper records, a phased approach that runs paper and digital processes in parallel is effective. Also prepare network infrastructure: install Wi-Fi in site offices or provide connected tablets so the cloud is accessible at all times. Finally, establish operational rules after implementation. For example, require "report progress in the app after the morning meeting each day" or "alert supervisors immediately when signs of schedule delay appear" so the digital tool does not go unused.

Expected Effects

Visualizing schedule management can greatly reduce the risk of schedule delays. When everyone knows the latest progress, early action can be taken to address potential delays, creating slack in the overall schedule. This allows for proactive procurement of necessary personnel and materials, reducing waiting times and setup inefficiencies. One construction company reported a 5% improvement in gross margin on large projects after adopting a cloud-based schedule system that sped up setup through real-time sharing. Smoother information sharing also accelerates problem response: when bad weather or unexpected issues occur, multiple stakeholders can view the situation together and quickly decide the best countermeasures. Moreover, moving away from individual-dependent progress management distributes workload across the organization, preventing overload on site managers. As a result, overtime is reduced and trust among stakeholders improves, contributing to overall project productivity gains.

3. Digitizing Drawings and Documents: Paperless Information Sharing

Challenge

Many construction sites still handle drawings and documents in paper form. Carrying printed construction drawings or rebar drawings to the site is convenient, but every update requires replacement and redistribution of sheets, making it time-consuming to ensure everyone has the latest version. Using paper drawings increases the chance that workers will execute work from an outdated version, causing rework and material waste. Additionally, analog tasks like traveling between the site and the office to get stamps or filing, storing, and mailing completion documents accumulate into significant loss. Paper-based drawing and document management burdens storage space and printing costs and fosters delays and mistakes in information sharing, making it a major inefficiency on sites.

Improvement Approach

Digitizing drawings and documents can eliminate such waste. First, manage drawings as digital files like PDFs and switch to viewing them on tablets or PCs. Instead of bringing tubes of large-format drawings to the site, carry a tablet so you can always zoom in and check the latest drawings. When design changes occur, updating the file in the cloud lets everyone access the new version immediately, preventing distribution oversights. Also digitize documents such as construction plans, safety documents, and daily reports using dedicated cloud services or construction information-sharing systems. For example, having daily reports submitted via smartphone to the cloud removes the need for site supervisors to return to the office daily to collect paper reports. In short, paperless workflows speed up administrative tasks and information transmission, which is key to improving site efficiency.

Implementation Points

To advance paperless workflows, map out both site and office workflows and digitize in stages. Trying to digitize everything at once may confuse the site, so start with high-impact, easy-to-implement items such as drawings and daily reports. Reduce resistance from site staff by offering tablet usage training and clearly explaining the benefits of digitization (easy search, portability, etc.). Decide on data management rules in advance—standardize file naming and folder structures so anyone can quickly find required drawings and documents. Ensure IT governance by backing up important documents and setting access permissions on servers for security. Keep paper originals for legally required retention periods in storage, but otherwise discard after digitization, balancing paperless initiatives with practical obligations.

Expected Effects

Digitizing drawings and documents will dramatically speed up information sharing. Time spent replacing paper drawings at the site becomes zero, eliminating transmission errors for design changes. Working from the latest information reduces rework and helps prevent quality defects. Printing and storage cost savings are also notable—no need to print and distribute multiple copies of drawings, and office storage can be better utilized. In one case, digitizing daily reports cut the time to create them in half, significantly reducing administrative burden on managers. Centralized cloud storage reduces time spent searching for information, eliminating the waste of "looking for things." Older drawings and documents can be found instantly with keyword search, speeding up responses to inquiries and considerations for additional work. In this way, paperless practices streamline routine tasks and improve communication between site and office.

4. Cloud Sharing and Information Integration: Connecting Site and Office

Challenge

Insufficient sharing of site information with headquarters and subcontractors also creates major waste. Traditionally, progress reports and document deliveries were done by phone, fax, or email, but information often stayed with individual staff, resulting in sharing gaps and time lags. For example, in some departments, updated design documents weren’t communicated to the site representative, leading to construction based on outdated drawings. Inefficiencies such as managers traveling to distant sites just to check conditions are also common. When information is not shared in real time, decision-making falls behind and response to problems is delayed. This lack of information integration generates losses across construction projects and hinders productivity improvements.

Improvement Approach

A solution is centralized information management using a cloud platform. Specifically, consolidate all project-related data—drawings, schedules, contracts, photos, and reports—on the cloud so stakeholders can access what they need as required. This allows headquarters to instantly review photos or daily reports uploaded from the site, and design staff to check 3D model data from the office, enabling simultaneous sharing of the same information across locations. Tools with chat or commenting features on the cloud can handle Q&A and approval flows for drawings and documents online, accelerating decision-making. The aim is to eliminate the "information gap between site and office" by creating an environment where everyone can always access the latest information via the cloud.

Implementation Points

When introducing a cloud service, first define the scope of information handled internally and the sharing range. Set project-specific folders and permissions to organize who shares what with whom, ensuring appropriate collaboration. Supplying tablets or PCs to the site is meaningless if they are not used, so improve the site's communication environment. For areas where LTE or 5G is unstable, consider pocket Wi‑Fi or repeaters. To ease concerns about storing sensitive data in the cloud, verify the cloud provider’s security measures (encryption and access restrictions) and inform staff to build confidence. Conduct operation training so site clerks and others can reliably upload and download files. Also, avoid using multiple systems that cause confusion—prefer a single unified platform. If proprietary systems must be used together, leverage integration functions (such as API links) to prevent duplicate data entry.

Expected Effects

Once cloud-based information sharing takes hold, communication losses between site and headquarters dramatically decrease. For example, decision-making that used to be delayed half a day while waiting for site reports can now be made immediately by viewing shared photos and data. If progress and construction details are shared in real time across departments, the organization can flexibly respond to sudden schedule changes and provide speedy support during troubles. A major benefit is reduction in duplicate entry and transcription errors—one shared data source eliminates the waste of multiple Excel ledgers being maintained separately. Site representatives will also spend less time preparing separate reports for headquarters and have more time for supervision. Cloud adoption in the construction industry is accelerating, with over 60% of companies reportedly using some form of cloud service. Centralizing information on the cloud directly links to operational efficiency and cost savings and forms the foundation for telework and multi-site management—an indispensable initiative for the future of construction.

5. Streamlining Safety Management: Toward Zero Accidents with Digital Technology

Challenge

Safety management at construction sites is paramount, but ensuring it requires substantial time and effort. Morning meetings for KY activities (hazard prediction activities), safety patrols, and filling out inspection forms keep site managers and foremen busy with safety tasks every day. Still, human error continues to cause accidents, and a serious incident can lead to work stoppage, schedule delays, and compensation claims that seriously damage the business. Traditional safety management relies heavily on human experience and vigilance, leaving residual risk of omissions and mistakes. Moreover, preparing and submitting safety documents (such as near-miss reports and occupational safety regulation paperwork) is cumbersome, and site staff often say they are spending too much time on formal paperwork. Inefficiencies in safety management increase onsite burden and risk missing preventable accidents, so improvements are necessary.

Improvement Approach

Using IoT sensors and AI technologies is effective for advancing safety management efficiency and sophistication. For example, wearable sensors that detect proximity between heavy equipment and workers and sound alarms, or AI cameras that monitor the site and automatically detect missing helmets or entry into hazardous areas, enable 24/7 safety monitoring beyond human observation. Systems that attach accelerometers to workers’ helmets to detect falls or impacts and immediately notify managers shorten initial response times. Digitizing safety checklists on tablets with photo attachments prevents inspection omissions and centralizes records. AR technology can display virtual restricted zones in the field of view to visually warn workers. In short, support human monitoring and inspection tasks with digital tools to create systems that detect and respond to risks in real time—this is the key to streamlining safety management.

Implementation Points

When implementing IoT and AI safety tools, prioritize those that address the site’s specific needs. For example, introduce fall-detection sensors for sites with many high-elevation tasks and implement equipment‑worker collision prevention systems where vehicle work dominates—deploy technology first where risk is highest. Initial costs may be involved, but check for national or local government subsidies that can help. Simply distributing new safety devices is not enough—hold briefings and training for the workers who will use them. Some sensors require regular maintenance or battery replacement, so assign responsible personnel to ensure ongoing operation. Also, update site safety rules and manuals to include how to use digital devices, and integrate traditional safety activities with new technologies. Combining "human eyes + digital eyes" in layered safety measures provides more reliable prevention of workplace accidents.

Expected Effects

Strengthening safety management with digital technologies will dramatically increase the rate of preventing occupational accidents. Fewer near-misses and approaching zero accidents not only protect lives but also help maintain schedules and reduce costs. Time and expenses spent on accident response and compensation are eliminated, allowing focus on productive work. Around-the-clock monitoring by sensors and cameras also reduces the mental burden on managers. Digitizing safety documents simplifies daily recordkeeping and reduces time spent on reporting tasks. Studies show workplaces that introduced wearable sensors and AI monitoring experienced significant reductions in near-miss incidents between heavy equipment and workers compared to before implementation. Improved safety levels boost site reliability, enhance client and community reputation, and can lead to more future contract opportunities. As the saying goes, "No efficiency without safety," and using digital tools to achieve zero accidents contributes to true work-style reform and stronger onsite capability.

Start Site Improvement with "Simple Surveying"

Above, we introduced five methods to reduce waste and improve efficiency on construction sites. Adopting everything at once may be difficult, so it is crucial to advance DX step by step, starting with the areas that offer the most impact. We especially recommend introducing a "simple surveying" system as the first step in site improvement. Recently, high-precision smartphone-based simple surveying systems such as LRTK (pronounced "el-ar-tee-kay") have emerged. With LRTK, anyone can obtain centimeter-level position-tagged point cloud data just by attaching a small dedicated device to a smartphone and walking while pointing the camera. For example, a 100-meter slope can be 3D-scanned in about one minute. On the acquired point cloud, distances, areas, and volumes can be measured on-site, and uploading to the cloud allows the office to instantly view and share the 3D model. LRTK also overlays design drawings or model data onto real space using AR, enabling intuitive sharing of the finished image and verification of stakeout positions. Tools that combine the ease of use of a single smartphone with survey-level accuracy are true trump cards for site efficiency.

Even small initiatives can demonstrate efficiency gains when actually implemented on site. Simple surveying with LRTK is an ideal entry point to site DX—shortening survey time, better utilizing manpower, and speeding up data sharing deliver triple benefits. As a first step to reduce waste on construction sites, consider adopting such cutting-edge tools. Accumulating small reforms will eventually lead to significant productivity improvements and higher profit margins. Use the five methods presented in this definitive site improvement guide as inspiration, and steadily implement measures your company can take on its own sites to improve efficiency.