How to streamline conservation and restoration of cultural properties with 3D? Cost-effectiveness and 6 use cases

In conservation and restoration of cultural properties, preserving, repairing, and conveying information are all required simultaneously. Moreover, no two subjects are in the same condition. Materials vary—wood, stone, earth, metal, lacquer, paper—and the way damage progresses, the environment in which they are placed, and repair histories all differ. For this reason, while on-site judgment based on experience is emphasized, there tends to be variability in the granularity of records and how information is shared, which creates the issue that rework can easily occur at some stage of investigation, design, construction, or reporting.

One approach that is attracting attention as a way to organize these issues and achieve both quality and efficiency in conservation and restoration is the use of 3D. From the term “3D,” many may imagine expensive, highly specialized initiatives. However, from a practical standpoint, it is not necessary to introduce large-scale systems from the outset. What matters is identifying at which processes, and to what degree of accuracy and information volume, 3D is needed, and using 3D in a way that fits the purpose. Doing so can prevent omissions in records, reduce differences in understanding among stakeholders, improve the validity of repair plans, and reduce on-site burden.

This article organizes the meaning of incorporating 3D into conservation and restoration of cultural properties from a practical viewpoint of cost-effectiveness. It then explains concretely in which situations efficiency is actually improved, presenting six use cases. The summary is oriented toward on-site operations so that those responsible considering adoption can more easily decide where to start and where effects will appear.

Table of Contents

• Why 3D is needed in conservation and restoration of cultural properties

• How to think about the cost-effectiveness of 3D adoption

• Use case 1 Increase the accuracy and reproducibility of current-condition records

• Use case 2 Make it easier to grasp deterioration and decide repair scope

• Use case 3 Speed up consensus-building among stakeholders

• Use case 4 Streamline temporary works planning and construction reviews

• Use case 5 Facilitate post-repair comparison, verification, and reporting

• Use case 6 Leverage for public use and as an asset for the next repair

• How to proceed with successful 3D adoption

• Conclusion

Why 3D is needed in conservation and restoration of cultural properties

The most important thing in conservation and restoration of cultural properties is to accurately grasp the current condition of the subject and leave a record that allows the decision-making process to be tracked afterward. Traditionally on-site, various recording methods have been used—photographs, field notebooks, hand measurements, development drawings, cross-sections, and observation notes. These remain very important today, and 3D does not make them unnecessary. However, when dealing with complex shapes or wide-ranging subjects, taking measurements by hand, drawing by eye, and explaining by words inevitably lead to omissions and interpretation differences.

For example, roof or eave sagging, bulging of wall surfaces, stone displacement, fine undulations on carved surfaces, and the positional relationships of complex joints or connections can be hard to convey with only plan views or cross-sections. Even if one thought they understood the site, recognition can shift when handed to another person, or something that seemed fine at the design stage may reveal interference or dimensional discrepancies during construction. Conservation and restoration relies more on on-site judgment than typical new construction, so the accuracy of preliminary information directly affects the stability of subsequent processes.

This is where 3D helps: it allows you to grasp shapes and positional relationships as surfaces and solids. It does more than merely render appearance in three dimensions; it makes it spatially easier to understand where things have sunk, chipped, shifted, or are under stress. Information that can be seen in photos but not measured, or that can be organized on drawings but does not convey the whole, can be shared on a common foundation—this is of great value.

Moreover, conservation and restoration workflows are continuous: current-condition recording, policy consideration, partial dismantling, repair, restoration, reporting, and public utilization. If separate records are created for each stage and they are not connected, it becomes necessary to reinterpret information each time. This creates time loss and breeds decision-making errors. Placing 3D at the core makes it easier to base considerations on current-condition records, reflect the results in construction, compare before and after repairs, and reuse outputs—creating a smooth flow. In other words, the value of 3D lies not in being a one-off convenient recording method but in being a common foundation that connects information across processes.

The environment surrounding cultural properties is also changing. Requirements for conservation and restoration are becoming more complex year by year—greater emphasis on accountability, long-term preservation of records, collaboration with related institutions, advanced public utilization, and 대응 to manpower shortages. To run high-quality work with limited personnel, mechanisms are needed to support individual-based judgment and standardize information sharing. In that trend, 3D is becoming positioned less as a special advanced technology and more as a means to support stable practical operations.

How to think about the cost-effectiveness of 3D adoption

When the topic turns to 3D adoption, cost is what many sites worry about first. However, judging cost-effectiveness in conservation and restoration solely by initial expenditure is misleading. In practice, you need to consider not only how much working time is reduced but also how much decision accuracy improves, how much rework is cut, and how much the outputs can be reused.

First, understand that the real burden in conservation and restoration sites is not the measurement work itself, which is visually evident, but the subsequent chain of organizing, explaining, confirming, and returning work. For example, if initial measured values are insufficient and additional checks are needed later, re-visits or re-planning of scaffolding may arise. If interpretations diverge during drafting, meeting time among staff increases. If interference is found during construction, on-site adjustments and document revisions become necessary. These indirect costs are hard to show in estimates yet can greatly raise total man-hours.

It is realistic to evaluate the cost-effectiveness of 3D by how much it reduces these less-visible losses. For instance, if initial records are highly accurate, inquiries in later stages decrease. If everyone can view the same three-dimensional information, sharing the basis for decisions accelerates. If before-and-after repairs can be compared on the same standard, preparing reports becomes easier. Thus, the effect of 3D adoption is not merely time-saving in one step but smoothing the entire workflow.

When considering cost-effectiveness, it is also important to appropriately narrow the scope of adoption. It is not necessary to always record the entire subject at the highest accuracy. Prioritize areas that require high precision, where shape understanding is important, where accountability is heavy, or where future reuse value is high; combine 3D with traditional methods for the rest. Because differences among subjects in conservation and restoration are large, you should not treat 3D as a universal replacement but focus its use where it yields the greatest effect.

Furthermore, the reusability of outputs is a major criterion. Records captured in 3D can be repurposed beyond the immediate project—for future inspections, later repairs, post-disaster comparisons, public exhibitions, and educational uses. Conservation and restoration is not a one-time event but an activity that interacts with the subject across a long lifespan. Thinking in this way, you should evaluate not only the benefits for the current work but how much the records can be reused as a foundation for future preservation management. This is especially important for cultural properties that require long-term perspectives.

Of course, efficiency is not automatically achieved just by introducing 3D. If you measure without clear objectives, produce unnecessarily heavy data, or deliver files in formats nobody uses, the burden can increase. To enhance cost-effectiveness, decide in advance what you want to judge with 3D, who will use it in which processes, and in what format the records should be preserved. In conservation and restoration, it is more important that 3D is usable than merely precise. Whether you can maintain this perspective determines the success or failure of adoption.

Use case 1 Increase the accuracy and reproducibility of current-condition records

The starting point for conservation and restoration is the current-condition record. How you capture the current condition and at what granularity you record it affect all subsequent investigation, diagnosis, design, construction, and reporting. The most obvious effect of using 3D is that it can increase the accuracy and reproducibility of these current-condition records.

Traditionally, current-condition records typically combine wide-angle photos, detail photos, hand measurements, sketches, and drafting. This is still effective, but when recording complex three-dimensional shapes or wide-ranging subjects, it tends to depend on the skill and time of the person in charge. If shooting positions differ, comparisons become difficult; if measurement locations are limited, fine distortions may not be captured. Shapes that seemed obvious on-site may not be fully reproducible later from the materials alone.

By incorporating 3D records, you can preserve the actual shape of the subject as spatial information, greatly improving reproducibility when reviewing the data later. This does not merely mean that the appearance is displayed in three dimensions. You can cut needed cross-sections, check from arbitrary directions, compare with existing drawings, and examine deformation trends at specific points, broadening the practical uses of the records. In conservation and restoration, there are many states that can only be seen once on-site. How well you can preserve that single state in a revisitable form is important, and 3D is a very strong means in that regard.

3D is particularly effective for subjects that include information difficult to grasp with planar drawings alone—curved surfaces, slopes, twists, settlement, and unevenness. For example, a slight bulge on a building’s exterior wall may look striking in a photo but be hard to explain quantitatively. Conversely, when converted to drawings, it can be difficult to convey the intuitive degree of deformation. If the current condition is preserved in 3D, it becomes easy to confirm both visually and dimensionally, aiding decisions on the need and priority of repairs.

Also, the value of 3D in current-condition records lies in making them easy to interpret even when personnel change. Conservation and restoration often span long periods, and staff turnover is not uncommon. In such cases, tacit knowledge tends to be lost if only photos and notes exist, but 3D records help maintain at least a common understanding of shapes. This has a significant effect on stabilizing handovers.

Furthermore, high-reproducibility current-condition records serve as the basis for later comparison and verification. If you accurately preserve the pre-repair state, it becomes easier to explain what improved and what was intentionally left after repair. In conservation and restoration, the goal is not simply to make things look new but to clarify the extent of intervention. As foundational material, 3D current-condition records are very well suited to this purpose.

Use case 2 Make it easier to grasp deterioration and decide repair scope

What is difficult in conservation and restoration is not merely identifying whether deterioration exists but appropriately judging how much should be treated as the repair target. For cultural properties, you cannot simply replace everything that is worn. You must distinguish traces to be preserved, areas to be reinforced, and parts that can be monitored over time. 3D is effective for this decision-making as well.

In evaluating deterioration, perspectives differ by the type of phenomenon—cracks, abrasion, deformation, detachment, loss, settlement, displacement, etc. Moreover, these phenomena do not always occur independently; multiple deteriorations can be interrelated. For example, localized settlement may cause deformation in surrounding members, which in turn accelerates surface delamination elsewhere. To consider such correlations, you need to view positional relationships within the whole as well as in parts.

Using 3D makes it easier to grasp deterioration points within the overall shape. You can understand in three dimensions which height zones damage is concentrated in, which surfaces are affected, and in which direction deformation is progressing. This allows you to read trends in phenomena rather than just listing damages. In conservation and restoration, it is important to link symptom records to cause estimation, and 3D is effective as that bridge.

Repair scope decisions are also occasions where differences in stakeholder perception easily arise. Investigators, designers, contractors, supervisors—each sees different materials and has different experience, so their evaluations of the same damage can diverge. Using 3D data as a common basis makes it easier to clarify which part and which condition are being discussed. Scope settings that tend to be ambiguous when explained in words become easier to agree on when confirmed while viewing three-dimensional information.

Narrowing the repair scope appropriately is also important to prevent excessive intervention. Conservation philosophy emphasizes avoiding unnecessary intervention. If you record the current condition widely in 3D so you can see the distribution and degree of damage relatively, it becomes easier to identify where intervention is truly necessary. As a result, repair volumes can be optimized, benefiting both conservation principles and work efficiency.

Thus, 3D is not for making deterioration look dramatic but serves as a foundation to support calm repair decision-making. Visualizing symptoms and sharing scope judgments helps fulfill accountability for conservation work. This contributes not only to operational efficiency but also to the very validity of repairs.

Use case 3 Speed up consensus-building among stakeholders

Conservation and restoration of cultural properties is a collaborative process involving many stakeholders: investigators, designers, constructors, managers, administrative officials, owners, and academic experts—all with different perspectives on the same subject. A common problem is differences in understanding that arise from the information each person is viewing. Even with sufficient materials, if interpretations are not shared, meetings drag on and decision-making is delayed.

The main reason consensus-building takes time is that not everyone understands the subject’s condition in the same way. Photos can show close-up situations but make overall positions hard to grasp; drawings can organize relationships but lack a sense of the real object. Written explanations depend on prior knowledge and can lead to gaps in understanding due to differences in field experience. In a field like conservation and restoration, where the subject is unique and careful judgment is required, these differences translate directly into delays in consensus-building.

Using 3D helps align the starting point for discussions. Because you can confirm the overall shape and the positional relationships of problem areas on a shared screen, less preliminary explanation is needed and it’s easier to get into substantive discussion. For example, whether a deformation is localized or part of an overall trend, or how a proposed repair area relates to surrounding members—seeing these points in three dimensions helps concretize the discussion.

In consensus-building, explanations are often needed not only for specialists but also for stakeholders not familiar with technical drawings. Owners and managers can take time to understand repair rationale with photos and drawings alone. 3D tends to support intuitive understanding, making it easier to explain why a certain area needs repair and why a specific method is chosen. Clearer explanations lead to faster approvals.

Speeding consensus-building also directly affects site stability. If policy decisions are delayed, preparation work and construction sequences are impacted. Conversely, if a common understanding is reached early, subsequent changes decrease and coordination costs among stakeholders fall. In conservation and restoration, new findings sometimes require policy changes midproject, but even in those cases, a shared 3D foundation makes it easier to communicate the scope of the changes.

Thus, 3D is not a flashy showpiece but a practical tool supporting decision-making. Faster consensus-building not only shortens meeting times but also leads to less uncertain repair planning—and that benefit appears as improved overall site efficiency.

Use case 4 Streamline temporary works planning and construction reviews

Even when investigation and design are appropriate, unexpected rework can occur if conditions do not align at the construction stage. In cultural property sites, uniform conditions assumed in new construction do not apply, so preconstruction review is especially important for transport routes, work space, scaffolding plans, protection coverage, and checking for member interference. Here too, 3D use has major effects.

For example, in cramped sites, locations with large elevation differences, or where contact risk with existing members is high, a plan-view alone may not convey an adequate sense of the work. A plan that looks feasible on paper may in reality prevent a person from standing, tools from fitting, or temporary materials from being placed without interference. Since cultural properties cannot be damaged, there are limits to on-site adjustments. How much can be resolved in advance directly affects safety and efficiency.

If you capture the current condition in 3D, you can consider temporary works while checking workspaces and surrounding conditions in three dimensions. Scaffolding positions, worker movement paths, temporary storage locations for materials, and distances to parts needing protection can be considered in the spatial whole, not just in plan or section, improving planning accuracy. This leads to enhanced safety and reduces unforeseen issues after construction begins.

3D also helps with detailing member interfaces and restoration procedures. Conservation and restoration must account for existing dimensional variations and distortions when deciding how things will fit. When introducing new members or reinforcement parts, it’s important in advance to understand where there is clearance and where tight fits will occur. Reviewing these aspects while checking the actual condition in 3D reduces problems that would otherwise only become apparent during construction.

Moreover, 3D in construction review helps compensate for differences in experience. What a veteran can visualize from drawings and site experience may be hard for younger staff or those from other fields. Reviewing with 3D helps align assumptions and stabilizes the quality of meetings. This is also effective for personnel development.

Temporary works planning and construction review are often overshadowed by the main repair work, but they are crucial to overall efficiency. Rework in this phase risks both time loss and harm to the subject. Using 3D to improve the accuracy of preconstruction reviews is not mere convenience but a prudent practice for protecting cultural properties.

Use case 5 Facilitate post-repair comparison, verification, and reporting

Conservation and restoration is not complete just because construction is finished. It is important to organize how the subject stands after repair, clarify what changed compared to before repair and what was intentionally left, and preserve that in a form that can be conveyed to future generations. The comparison, verification, and reporting stage is labor-intensive though often invisible from the outside—and 3D can greatly streamline this stage.

Traditionally, before-and-after comparisons are often done by juxtaposing photos, annotating drawings, and combining written descriptions. These are necessary tasks but aligning comparison standards can be difficult. Slight differences in shooting positions change impressions; if drawing updates are limited in scope, it’s hard to convey overall differences. Text can record detail but requires readers to supplement spatial images.

If you have 3D models of the before-and-after states, you can more easily compare the same subject from the same viewpoints and standards. It becomes easier to organize what was repaired, to what extent deformation was corrected, and how missing parts were restored, and the basis for including such content in reports becomes clear. This not only strengthens the persuasive power of records but also reduces the burden of creating documentation.

Reporting also requires translating what is in the minds of site staff into a form readable by third parties. This translation work can be heavier than expected, especially in long-term repairs, where accurately recalling the rationale of intermediate decisions becomes difficult. Organizing materials around 3D lets you refer back to the state at the time while writing, reducing omissions and ambiguities.

Post-repair comparison and verification are not just about demonstrating results. They also serve to record the judgments made for future inspections and repairs. Cultural properties are maintained over long periods; records that only the current staff can understand are insufficient. They must be left in a form that the next generation can easily interpret. 3D is effective as a bridge for that purpose.

Thus, 3D is not only for investigation or design. It supports accountability after repair and enhances the continuity of records, making it a cost-effective area of use. It is a practical foundation that helps preserve record quality while progressing work without undue strain—not merely a tool to make report preparation easier.

Use case 6 Leverage for public use and as an asset for the next repair

The aim of conservation and restoration of cultural properties is not repair itself but the process of passing cultural assets on to the future. Therefore, it is wasteful to close off information obtained during repair as a one-off deliverable. A major strength of 3D is that it preserves records as assets that can readily be used for public engagement and for future repairs.

For public use, 3D is effective as a means to communicate the condition and repair details of cultural properties to the general public. Even content that is difficult to convey with technical drawings and terminology can be explained using three-dimensional shapes and changes, lowering the barrier to understanding. This helps not only exhibitions and interpretations but also educational outreach, local awareness-raising, and explaining the significance of repair projects. Conservation and restoration are not solely expert activities; they continue under public understanding. In that sense, having understandable deliverables is of great value.

From the viewpoint of future management, 3D is also important. Cultural properties change after repair due to environmental shifts and aging. If a 3D record from the time of repair remains, it can be used as a comparison baseline during future inspections. It becomes easier to determine what has newly changed, which changes are within expectations, and which are signs requiring attention. This aligns well with preventive maintenance approaches and helps judge the scale and priorities of future repairs.

Conservation and restoration is not a single event but a continuous sequence of long-term upkeep. Making the knowledge gained from current investigations and repairs reusable for the next person responsible is itself future efficiency. With 3D data, the burden of initial surveys next time can be reduced, and investigations can start while maintaining continuity with previous work. This perspective is extremely important in an era where manpower shortages are a challenge.

Moreover, “assetization” implies more than simply storing data. It requires organizing data so it is usable when needed, easy for stakeholders to reference, and adaptable to future uses. If you use 3D in conservation and restoration, plan not only for delivery but also for subsequent use cases. That way, what is created in the current project contributes to future cost reductions and improved decision quality.

Thus, the cost-effectiveness of 3D use cannot be measured only by shortening the current construction period. Considering public use, succession, comparison, and reuse, 3D in conservation and restoration becomes more than a convenient record—it functions as a long-term management asset. Keeping this perspective makes the value of adoption clearer.

How to proceed with successful 3D adoption

To achieve results with 3D use, the way you proceed with adoption is more important than the equipment or methods themselves. Many implementations fail not because 3D is bad but because it was started without clarifying what it is for. Given the large differences among subjects in conservation and restoration, it is essential to clarify adoption objectives and roll out operations in stages.

First, narrow the issues you want to solve with 3D to one or two. For example, whether you want to reduce omissions in current-condition records, make stakeholder explanations easier, or standardize before-and-after comparisons will change the required accuracy and the form of deliverables. Once objectives are set, it becomes easier to organize the range to be captured and the processes that will use it. Conversely, aiming for万能 data usable for everything from the start tends to increase acquisition volume and result in unused data.

Next, decide the role-sharing between 3D and traditional methods. 3D is powerful, but it does not replace photographs, hand sketches, observation notes, or material investigation records. In fact, qualities that are hard to capture in 3D—texture, color tone, sound, tactile feel, and on-the-job insights—need to be complemented by other recording methods. Successful sites clearly define what to preserve in 3D and what to supplement with other records. This organization helps prevent data excess or insufficiency.

It is also effective to start small in the early stages of adoption. Rather than the entire subject, try areas where deformation is large, where explanation is difficult, or where future comparison is desired—places where effects are easily seen. Small successful cases build on-site understanding and make it easier to expand use in subsequent projects. Because conservation and restoration requires caution, cultivating an operation that fits the site is more realistic than attempting full-scale adoption immediately.

How deliverables are handed over is another key to adoption success. Formats that only on-site staff can handle lead to task dependency. Be mindful of forms that are easy for stakeholders to check, organized for future reference, and structured for inclusion in reports. Conservation and restoration assumes staff turnover and long-term preservation, so data that only certain people can understand is insufficient. Designing for retrievability is what sustains the benefits of 3D.

Finally, do not overlook how to handle coordinates and positional information. In conservation and restoration, it is sometimes important not only to record individual shapes but also to document positional relationships within the site, relations with surrounding topography, and consistency with future re-surveys. In such cases, linking positional information effectively to 3D records expands their usability. Viewing records not just as shape preservation but as location-linked management information makes 3D a stronger foundation.

Conclusion

Using 3D in conservation and restoration of cultural properties is not about adopting flashy advanced technology. It is a practical means to accurately preserve current conditions, assist in understanding deterioration, align stakeholders’ perceptions, stabilize construction reviews, facilitate post-repair comparison and reporting, and link outputs to long-term management assets. When considering cost-effectiveness, you must look beyond simple adoption costs and consider reductions in rework, improvements in decision accuracy, decreased explanatory burden, and reusability of outputs—i.e., an overall optimization perspective.

The value of 3D increases particularly for cultural properties, which are unique, require careful judgment, and assume long-term succession. The important points are to clarify objectives, start within the necessary scope, and combine 3D properly with traditional recording methods. Do that, and 3D becomes not a special technology but a practical tool that steadily supports on-site conservation and restoration.

Going forward, the importance of integrated records that include positional information as well as shapes will likely increase in conservation and restoration of cultural properties. To spatially grasp site conditions and link repair records to subsequent management, having a system that can easily handle high-precision positional information will make operations easier. If you want to make surveys and recording work at cultural properties more efficient, consider improving on-site positioning environments along with 3D use. One option is LRTK, an iPhone-mounted GNSS high-precision positioning device, which can enhance the accuracy and operability of records that include positional information and is well suited to practical conservation and restoration work.