Save Cost and Time! Practical Techniques for Improving Construction Site Efficiency - Improvements You Can Use Today

In recent years, cost reduction and shortening construction periods have become major issues in the construction industry. From 2024, limits on overtime work also apply to construction, making productivity improvements urgent amid labor shortages. In fact, construction is said to have lower labor productivity compared to other industries, and traditional manual work and inefficient practices on sites create a lot of waste. In response, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) is promoting a project called “i-Construction” with the goal of improving construction site productivity by 50%. However, site efficiency is a common concern not only for large general contractors but also for construction managers at small and medium-sized companies, site supervisors, and civil engineers in local governments—essentially everyone involved in construction.

This article categorizes typical causes of inefficiency on construction sites into five to seven groups and introduces practical improvements you can implement starting today. For each item, we explain from the site perspective in the order of “Issue,” “Improvement,” “Implementation Points,” and “Expected Effects,” and summarize with concrete implementation examples and numerical data to make the ideas easier to picture. At the end, we also introduce the latest simple surveying method you can do with a smartphone (LRTK) as a first step in site improvement. Now, let’s look at practical techniques that can save both cost and time!

Streamlining Surveying Work

Issue: Surveying, the starting point of civil engineering and building work, has traditionally relied on manual labor and optical instruments. Multiple survey teams using transits and measuring tapes would need days to measure points across a wide site, consuming both labor costs and time. On complex terrain, measurements at hazardous locations are unavoidable, creating safety risks for workers and requiring re-measurements due to mistakes. When a limited crew covers multiple sites, progress on the entire project can be delayed while waiting for surveying to be completed.

Improvement: Dramatic labor savings and time reduction are possible through digital surveying using ICT such as drones and 3D laser scanners. Aerial photogrammetry or laser surveys using unmanned aerial vehicles (UAVs) can acquire extensive terrain data from above in a short time. For example, surveying a flat 2-hectare development site that used to take 2–3 days (about 40 man-hours) has been reported to be completed by an automated drone flight of around one hour. Drones equipped with high-precision GPS (RTK) can capture centimeter-level accurate detailed 3D point clouds and orthophotos, enabling safe surveying even on cliffs or disaster sites that are difficult to access on foot. Recently, methods combining a smartphone with a compact high-precision GNSS receiver have emerged, enabling a single person to perform surveying and 3D scanning—making on-site measurement easy even without specialized equipment.

Implementation Points: When introducing ICT surveying, it’s important to choose the appropriate method based on site scale and terrain. Drone photogrammetry is effective for wide development sites, but heavily wooded areas may require laser scanning or a combination with ground surveying. Start with trial implementation on small projects to get accustomed to operation and data processing. Drones and 3D scanners can be rented or outsourced to specialist contractors instead of purchased, allowing you to verify effectiveness while minimizing initial investment. The acquired point-cloud data can be easily processed with dedicated software or cloud services and used for drawings and quantity calculations. If there is no in-house know-how, use ICT construction training courses or manufacturer support to train site staff.

Expected Effects: Streamlining surveying work can significantly save human resources and time. In some cases, it enables surveying to be completed by a single person, reducing labor costs and alleviating labor shortages. If work time can be reduced to about one-fifth to one-tenth of conventional methods, the resulting slack in schedules allows earlier start of other tasks. Eliminating the need for personnel to enter hazardous areas also improves safety, contributing to a reduction in occupational accident risk. The high-precision 3D data obtained can be used for quality control and volume calculations, preventing omissions and rework and helping ensure quality. Overall, the introduction of modern surveying technology drastically enhances both productivity and safety on site, directly contributing to cost reduction and shorter construction periods.

Optimizing Schedule Management

Issue: Schedule management becomes more complex the more stakeholders and work processes are involved. Traditionally, schedules were planned using Excel sheets or whiteboards, and adjustments were coordinated by phone or email among responsible parties as progress changed. This approach requires individuals to constantly check the latest status, and the more stakeholders there are, the harder it is to maintain an overall grasp. Important information can be buried in emails and missed, or changes due to weather or material delays may not be communicated to the site in a timely manner, causing confusion. As a result, mis-sequencing of tasks and waiting times occur, lowering productivity and leading to unnecessary overtime and project delays.

Improvement: Digitalization and visualization of schedule management can optimize complex scheduling. Specifically, introduce cloud-based schedule management systems or apps so all stakeholders can share and update the schedule in real time. Free or low-cost construction management apps are available from various vendors and can be operated intuitively on smartphones and tablets. With these tools, you can centrally manage who does what and when, and instantly notify everyone of schedule changes. For example, one site set up a system where all foremen could check the latest schedule on their phones, which drastically reduced waiting time caused by missed communications. Also, adopting a routine of visualizing progress in weekly schedule meetings and giving immediate feedback on issues enables the entire site to respond proactively.

Implementation Points: When introducing a schedule management tool, choose a system that fits the site scale and intended use. For small sites, simply sharing a spreadsheet in the cloud can be effective, but for projects with many stakeholders, a dedicated app is more appropriate. The key is to enforce an operational rule of "sharing the latest plan on a single platform." Having paper schedules or individually managed calendars run in parallel causes discrepancies, so make it a habit for everyone to always view the latest cloud data. Some veteran employees may be resistant at first, so allocate time for operational training and have them get used to the system by using it on-site. Simplify progress input and utilize convenient features like notifications to avoid increasing the burden on site staff.

Expected Effects: Optimizing schedule management enables smooth site operations without wasted effort, inconsistency, or unevenness. With everyone aware of the latest schedule, fewer sequencing errors and reworks occur, and workers’ standby time is minimized. Because schedule changes can be handled flexibly, on-time completion rates improve, boosting client trust. Schedule managers’ workloads are reduced, freeing them to focus on other important tasks. One small construction company reported that by thoroughly streamlining site operations they almost eliminated overtime and achieved more than 2,000 hours of annual labor savings. Proper schedule management not only improves productivity but also supports workstyle reform and employees’ work-life balance.

Digitizing Drawings and Documents

Issue: Managing drawings and documents at construction sites often consumes a lot of time. Printing and distributing large numbers of the latest drawings such as construction drawings and rebar drawings, and replacing paper drawings every time there’s a design change, is very laborious. Paper drawings can get dirty or torn on-site and become unreadable. Office documentation—construction plans, safety documents, completion inspection forms, photo logs, etc.—also accumulates, requiring time for filing, storage, and circulation/approval among stakeholders. Finding necessary information in paper form is cumbersome, and referring to past materials often becomes an inefficient search for “one sheet among a mountain of documents.” Paper also tends to be managed separately in the office and on-site, increasing the risk of transcription errors and inconsistent updates.

Improvement: Advancing the digitization and paperless management of drawings and documents significantly improves information management efficiency. For drawings, share CAD files and PDFs on the cloud and switch to viewing them on tablets or PCs at the site. This ensures everyone refers to the latest drawings and prevents construction mistakes caused by missed drawing replacements. You can also add digital markings or comments on drawings and share them instantly with stakeholders. Documents created in Word or Excel can be centrally managed in cloud storage so anyone can access the latest files when needed. Recently, field management apps have become popular that let staff enter daily reports and photos directly from the site via input forms based on submission templates, sharing them with the office in real time. For example, if inspection records or progress reports are input and submitted on a tablet at the site, the transcription work previously done back at the office becomes unnecessary. Introducing electronic approval systems can also eliminate the need to travel between site and office for stamps and seals.

Implementation Points: When moving toward paperless operations, don’t attempt to digitize everything at once; transition gradually starting with high-impact areas. Begin by introducing tablets for drawing viewing and photo sharing—areas where on-site benefits are large. Inform site staff of basic tablet operations and cloud folder usage, and allow a transition period where paper and digital are used in parallel to reduce resistance. When digitizing document templates, design user-friendly forms based on site feedback and simplify input fields. If there’s no IT-savvy person in-house, use prebuilt cloud services for construction businesses. Don’t forget security measures for electronic data (setting access permissions, backups, etc.) to ensure information is safe even without paper.

Expected Effects: Digitizing drawings and documents greatly improves the speed and accuracy of information sharing. Eliminating the need for people to move for drawing distribution or document stamping reduces waiting time between staff and prevents workflow stagnation. When everyone can always reference the latest information, misunderstandings and communication errors decrease, preventing construction mistakes and rework. Electronic data can be quickly searched by keywords or tags, improving efficiency when looking up past drawings or reports. Printing and binding costs are reduced and storage space becomes unnecessary, cutting office expenses. Reducing duplicate data entry from field to office also lightens clerical staff workloads, allowing them to devote more time to construction management and safety. Though it may seem mundane, document digitization is an important improvement measure that raises overall site productivity.

Strengthening Information Sharing with the Cloud

Issue: Poor communication between the site and the office or other stakeholders also reduces productivity. Relying on phone and fax for communication with workers or reporting to head office and owners takes time and can cause transmission errors. For example, when asking a designer about an on-site issue, the workflow of taking a photo, emailing it, and waiting for a reply can take several days. Sharing photos and videos by email attachment can require compression or splitting due to file size limits, creating extra work for recipients to download and organize files. When information is scattered across multiple chat apps and social networks, minutes and decisions can get lost and later become irretrievable—an “information lost” problem. Without a proper interdepartmental or inter-company information-sharing infrastructure, you often end up with manpower-heavy checks and duplicated work, slowing down site response.

Improvement: Establishing a cloud-based information-sharing platform accessible to both internal and external stakeholders significantly improves communication quality and speed. The previously mentioned schedule sharing and drawing cloudization are part of this, but you should also create a system for sharing daily on-site information in real time. Specifically, use a cloud tool as a unified hub to handle reports, contacts, and consultations (so-called "HO-Ren-So"). For example, unclear points during construction can be posted with photos to a cloud inquiry form and the design team can respond the same day. You can also stream live footage from a site webcam or upload fixed-point photos to the cloud so remote stakeholders can check site conditions. Using online meeting systems for remote inspections and meetings reduces travel time while speeding up decision-making. Since the COVID-19 pandemic, “remote site presence” without visiting in person has become more widespread, and combining cloud services with video calls for communication is becoming commonplace. Placing your information-sharing foundation in the cloud allows you to instantly deliver necessary information to the right people regardless of geographic constraints.

Implementation Points: To promote cloud use, first ensure both site and office have reliable internet connectivity. Install Wi‑Fi at site offices or provide company smartphones to staff so they can stay online. It’s also important to use the right tool for each purpose: use chat apps for casual daily communications, cloud storage for drawings and documents, and dedicated project management tools for formal deliberations—this classification helps keep information organized and prevents confusion. When external contractors or owners are involved, choose services that are easy for everyone and provide robust security. Formalize usage rules when introducing tools and share them with the team. For instance, define that “important communications must be conducted via the project management tool” and “photo data should be uploaded to cloud folders and shared by link.” Setting such operational rules prevents cloud tools from becoming mere formalities and ensures they deliver real benefits.

Expected Effects: A cloud-based information-sharing system greatly accelerates the speed of reporting and feedback from the site. Quick reception of design changes or defect instructions allows prompt responses, minimizing work stoppages and rework. When everyone can view and discuss the latest information on a single platform, misunderstandings decrease and trouble is less likely. In particular, online meetings and remote presence reduce travel time and transportation costs, directly improving productivity and cutting costs. Site agents can check and share materials from the field via the cloud without returning to the office, enabling more agile multitasking across sites. Establishing a culture of real-time information sharing strengthens team cohesion, improves motivation, and helps eliminate site-person dependence.

Visualizing Progress

Issue: The larger the project, the harder it is to grasp “how much work has been completed” at any given time. Poor progress management can lead to delays accumulating until problems are only noticed late, forcing reactive measures. Traditionally, progress judgment has often relied on the site agent’s experience and intuition, but subjectivity risks overlooking issues or introducing optimistic estimates. Gathering progress reports from each foreman and compiling them in Excel is labor-intensive and lacks real-time visibility. As a result, you can’t get an overall view of where delays or bottlenecks are in the schedule, which leads to last-minute manpower allocation or overtime to cover shortfalls—ad hoc responses.

Improvement: Introduce systems that make progress status visible, allowing anyone to grasp the current situation in real time. Create a progress dashboard linked to the schedule that shows planned vs. actual progress rates for each task with graphs and color coding, so delays and advances are immediately apparent. Even without dedicated software, regularly updating and sharing an S-curve (cumulative work volume curve) created in Excel can be effective. Simplifying and automating on-site progress reporting is also useful. If each foreman inputs daily output or completed tasks into a diary app, the data can be aggregated and automatically reflected in progress graphs. Where IoT is applicable, collecting real-time data such as equipment operation logs or sensor-measured transported soil volumes and calculating objective progress rates is effective. For example, weekly drone surveys to check as-built volumes or excavation/mounding progress in 3D allow early detection of delays. Use the visualized progress information in regular meetings to analyze causes and plan countermeasures.

Implementation Points: Setting appropriate KPIs (key performance indicators) is crucial for progress visualization. Clearly define what constitutes progress according to the project type. For earthwork, set quantitative indicators such as volume removed or backfilled; for concrete work, use placement volume or number of rebar assemblies completed. Choose indicators that can be measured daily. Avoid overly detailed KPIs that burden site staff; one or two simple indicators per major process are sufficient. Determine data collection methods that fit site conditions. Taking photos of the morning meeting board with each crew’s plan and progress and sharing them is already an effective visualization method; if possible, create a progress visualization board in PowerPoint and post it in the site office. The essential goal is to ensure everyone correctly recognizes current progress and remaining work. Use clear, intuitive displays and build an operational framework to quickly discuss and implement countermeasures when delays occur.

Expected Effects: Visualizing progress numerically and visually enables early detection of potential delays and problems. With real-time gaps between plan and performance shown, you can implement measures—such as increasing manpower or reorganizing tasks—while delays are still small. This prevents major schedule slips and improves on-time delivery rates. When site staff can objectively understand progress, teams develop a more autonomous improvement mindset. Clear knowledge of “how many days remain to complete what” brings focus to daily work plans and improves construction efficiency. Visualized progress data can also be used for reports to owners and upper management, enhancing project transparency and building trust. Overall, progress visualization helps anticipate and solve problems earlier, reducing unnecessary overtime and rushed work.

Automating Safety Management

Issue: Construction sites always carry risks such as falls, collisions with heavy equipment, and heatstroke. The number of fatalities from occupational accidents in Japan’s construction industry exceeds 200 per year—223 deaths in the 2023 statistics from the Ministry of Health, Labour and Welfare—making safety measures a top priority. Traditional safety measures like morning briefings, site patrols, and safety document checks depend largely on human observation and verbal reminders, which can miss hazards. Human error and complacency can lead to overlooked dangers, and accidents not only cost lives but also cause work stoppages, schedule delays, and loss of trust from the main contractor. As long as current safety management relies on human monitoring, achieving zero accidents is difficult.

Improvement: By leveraging the latest IoT technologies and sensors to digitize and automate safety management, you can complement human oversight and reduce accident risks. For example, helmets equipped with accelerometers can instantly detect falls and trigger alarms to alert nearby personnel. Proximity alarm sensors on heavy machinery and cranes can warn workers when they approach hazardous zones via buzzers or vibrating wearable devices. In hot environments, temperature and humidity sensors or WBGT monitors can track heat stress indices, automatically issuing alerts and instructing work stoppage or breaks when thresholds are exceeded. AI analysis of site camera footage can detect missing personal protective equipment (PPE) or unsafe behaviors and notify managers. Drone patrols can inspect high work areas to find scaffold defects without requiring personnel to perform direct checks. By deploying a network of sensors and AI rather than relying solely on human sight, you can detect hazards in real time and prevent accidents—creating “smart safety management.”

Implementation Points: When introducing safety technologies, focus first on the highest-priority risks for the site and implement measures accordingly. For sites with frequent high-elevation work, prioritize fall detection and safety harness sensors; for sites dominated by vehicle operations, choose proximity alarms and blind-spot cameras. Before deployment, thoroughly explain and train staff so they understand that the technology’s purpose is to protect them, not to “monitor” them. Start with pilot use on some teams to fine-tune alarm thresholds and operational flows to fit the site. Predefine response rules for system notifications (e.g., "when a heatstroke alert is issued, instruct all personnel to hydrate") to ensure prompt action. If multiple safety IoT systems are implemented, aim to centralize data on a platform so site supervisors and safety officers can view the overall situation on a smartphone.

Expected Effects: Automating safety management allows you to detect precursors to accidents in real time and respond immediately. Rapid discovery and rescue when a worker collapses can prevent serious injury, and alarms that warn of near-misses with heavy equipment can avert accidents altogether. Consequently, the number of occupational accidents can be significantly reduced, bringing you closer to the goal of "zero fatal accidents." Enhanced safety improves morale and makes the site a more attractive place to work, aiding recruitment and retention. Reduced accidents also cut down on work stoppages and investigative procedures, which positively affects schedule adherence and cost control. Although IoT and AI safety measures require initial investment, considering the enormous losses that follow an accident, their cost-effectiveness is very high. Aim for collaborative smart safety measures that combine people and technology to target zero occupational accidents.

As a First Step in Site Improvement: Use Smartphone-Based Simple Surveying "LRTK"

Among the efficiency measures introduced here, digitalizing surveying is especially easy to adopt and tends to deliver quick results. Finally, we introduce the latest simple surveying tool for smartphones: LRTK. LRTK consists of a palm-sized compact RTK-GNSS receiver and an iPhone app; attaching this device to an iPhone makes it possible for anyone to perform high-precision surveying easily—a groundbreaking solution.

With LRTK, baseline surveys and 3D scans for as-built verification that previously required specialized equipment can be done with just a smartphone. By simply walking around the site you can acquire highly accurate 3D point-cloud data and display it as a 3D model on the phone screen in real time. AR (augmented reality) features allow you to overlay the acquired point cloud or design model on the real scenery to intuitively check discrepancies between as-built conditions and design. Survey data synchronizes to the cloud in real time, and from an office PC you can view 2D/3D data via a browser and measure distances and areas. Sending a shared URL generated in the cloud lets stakeholders view the site’s 3D data on the web without dedicated software.

Using this kind of simple smartphone surveying with LRTK enables rapid and accurate site understanding even with a small team, greatly contributing to site labor savings and visualization. Tasks that previously required outsourcing to surveying companies or arranging heavy equipment and personnel can now be measured on the spot with a smartphone, improving operational agility. As-built management using point-cloud data helps prevent rework and ensure quality—delivering two benefits at once. Because it doesn’t require a large initial investment, it’s easy to introduce for small-to-medium projects and municipal works.

When starting site DX, it’s often hard to know where to begin, but adopting an easy and understandable tool like LRTK helps site staff quickly realize the benefits of digitalization. Seeing is believing—try smartphone surveying on site first to experience its efficiency. As the first step toward cost- and time-saving site improvements, consider adopting LRTK.