8 Ways to Use 3D Scanning for Cultural Heritage Buildings｜From Preservation and Restoration to Public Display

In the fieldwork related to the preservation and restoration of cultural heritage buildings, there are increasing challenges that cannot be fully understood with traditional measured drawings, photographs, and written records alone. Complex roof shapes, slight tilts, deformations of individual members, years of repair history, and relationships with surrounding topography are examples of situations that often require precise three-dimensional understanding of the structure. In this context, 3D scanning of cultural heritage buildings is attracting attention.

3D scanning is a method for acquiring the shape of a building as high-density three-dimensional data, enabling objective, volumetric recording of its current condition. It is not merely a technique for creating attractive 3D models, but has value as a practical means of supporting preservation, restoration, investigation, public display, and maintenance management on a single information platform. For cultural heritage buildings in particular, where it is often difficult to dismantle to confirm conditions, on-site work time is limited, and the history of changes must be passed on to future generations, the significance of non-contact, high-precision information capture is substantial.

On the other hand, the term “3D scan” has sometimes preceded understanding, and many responsible parties consider introducing it without clarity on its applications. Questions such as how to make use of the acquired data, how it differs from drawing, whether it truly helps restoration design, and whether it can be applied to public exhibitions and education are natural. In practice, if implemented without a clear purpose, the result can be an accumulation of data that is hard to use on site, making it difficult to achieve the expected outcomes.

Therefore, this article organizes and explains eight practical uses of 3D scanning for cultural heritage buildings along the flow from preservation and restoration to public display. It also details concepts to keep in mind at introduction and key points for successful utilization. If you want to review how cultural heritage buildings are recorded, improve the accuracy of investigations and restorations, or link data to future preservation and public display, please use this as a reference.

Table of contents

• Why 3D scanning becomes important for cultural heritage buildings

• Use 1 Record the current condition three-dimensionally to improve preservation accuracy

• Use 2 Utilize it to understand deformation and deterioration

• Use 3 Use it as material for restoration design and construction planning

• Use 4 Use it for component management and history organization

• Use 5 Record the process of repair work

• Use 6 Use it for disaster preparedness and recovery planning

• Use 7 Deploy it for public exhibitions and educational outreach

• Use 8 Streamline maintenance management and future re-surveys

• How to proceed to successfully implement 3D scanning for cultural heritage buildings

• Summary

Why 3D scanning becomes important for cultural heritage buildings

In preserving cultural heritage buildings, preserving appearance alone is insufficient. What is important is recording, in a verifiable form, which parts are in what condition, where traces of past repairs remain, and how the building’s overall distortion and relationship with its surroundings stand. Each cultural heritage building is unique, and site-specific characteristics are highly variable, so there are limits to understanding the whole solely from standardized drawings or photographs.

For example, roof warping, column tilt, sagging eaves, level differences with the pedestal, wall bulging, and subtle undulations of decorative parts are details that tend to be simplified when translated into plans or elevations. Yet such minute differences are often crucial for preservation and restoration decisions. With 3D scanning, the building’s shape can be captured as a cloud of points in space, allowing cross-sections, elevations, dimensions, volumes, displacements, and other aspects to be checked from multiple angles as needed. This means not merely an increase in the amount of records but an improvement in the quality of information available for decision-making.

On-site conditions at cultural heritage buildings often make long measurement periods difficult due to scaffolding setup, restricted access, limited work time, and sensitivity to the surrounding environment. In that regard, 3D scanning has the advantage of quickly capturing wide areas and enabling detailed review later in an office. Reducing on-site time while increasing the density of investigation also helps lessen the burden on stakeholders.

Perhaps most importantly, 3D data is not a one-off deliverable but becomes a future comparison baseline. Cultural heritage buildings change gradually over time. If today’s condition is recorded with high accuracy, when re-surveyed in several or many years, changes and their progression can be compared objectively. This has significant implications for preservation management. In other words, 3D scanning is a technology that not only records the state at a given time but also forms the foundation for future surveys and restorations.

Use 1 Record the current condition three-dimensionally to improve preservation accuracy

The most fundamental use of 3D scanning for cultural heritage buildings is creating a three-dimensional record of the current condition. Accurately and objectively preserving the building’s shape at the time of investigation is the starting point for all preservation work. Photographs depend on viewpoints and drawings involve representational omissions, but 3D scan data can retain the whole building as spatial information, providing high reproducibility when reviewed later.

The value of this volumetric record is not only in preserving the overall view. Variations in roof slope, subtle depressions at eaves, uneven floor surfaces, differences in intercolumn spacing, and wall lean—elements that are hard to notice on site—become easier to confirm in the data. Even if personnel change, stakeholders can discuss based on the same data, facilitating shared decision-making.

Also, once a cultural heritage building undergoes dismantling and repair, the original state cannot be fully restored. How accurately the pre-dismantling state is preserved directly affects preservation quality. With 3D scanning, the overall pre-dismantling geometry and positional relationships of each part can be recorded in detail, which helps in post-repair reconstruction reviews and the creation of explanatory materials. This is particularly significant for structures with complex joinery or roof forms, where preserving overall spatial relationships is valuable.

Moreover, the volumetric record serves as a basis for drawing. Because necessary cross-sections and elevations can be extracted from the data, on-site manual measurement labor can be reduced while still enabling efficient measured drawing work. Although editing is required to represent the data as drawings, the underlying data volume is sufficient to plan work with fewer reversals.

In preservation of cultural heritage buildings, first and foremost it is important to know the facts accurately. 3D scanning has great significance in that it preserves what was measured, not merely what was seen. Recording the current condition three-dimensionally becomes the foundation for all subsequent uses.

Use 2 Utilize it to understand deformation and deterioration

Early detection of deformation and deterioration is extremely important in managing cultural heritage buildings. Column tilt, beam sagging, roof surface settlement, wall bulging, and displacements around foundations are key signs of structural health, but quantifying these by visual inspection alone can be difficult. Using 3D scanning makes it easier to confirm such changes numerically.

For example, by establishing reference horizontal or vertical planes and comparing how much each part has shifted, you can grasp trends across the whole building. Information on whether the roof has settled in one direction, whether deformation is localized, or whether a wall is bulging outward is useful for prioritizing repairs. Issues that look similar visually may show clear differences when quantified.

In deterioration surveys, it is also important to organize cracks, delamination, missing parts, and signs of decay with positional information combined with photographs. With a 3D data foundation, it is easier to spatially understand which damage is where and how extensive it is. Even complex components that are hard to represent on plans or elevations can be recorded while preserving their three-dimensional relationships, making inspection result organization simpler.

Furthermore, comparing multiple 3D datasets over time allows tracking of progression. If a component that showed little problem in one year’s survey has deformed significantly several years later, comparing the data helps make more rational judgments about repair necessity and urgency. This is a great advantage for preventive conservation of cultural heritage buildings: rather than reacting after damage is manifest, trends can be detected and action taken early.

Because large-scale interventions are not always desirable for cultural heritage buildings, careful assessment and targeted interventions are important. 3D scanning is effective in shifting deformation and deterioration assessment from intuitive judgment to objective analysis.

Use 3 Use it as material for restoration design and construction planning

The value of 3D scanning does not end with recording. It is an extremely useful source of material for restoration design and construction planning of cultural heritage buildings because accurate understanding of the current condition makes it easier to decide what to preserve, what to repair, and in what sequence to proceed.

In restoration design, consistency between the current state and the restoration policy is crucial. Decisions such as how much of the building’s overall distortion to correct, how to treat later alterations, and the extent of member replacement require accurate understanding of the existing condition. With 3D data, multiple stakeholders can share the same shape information during discussions, reducing misunderstandings.

From the construction planning perspective, 3D data can inform scaffold placement, delivery routes, securing workspaces, and clearance checks with surrounding structures. Repair sites for cultural heritage buildings do not have the same freedoms as typical new construction; work must be carried out safely in confined spaces without damaging existing members. For that reason, understanding the shapes of the building and its surroundings in advance is important. Using 3D scan data makes it possible to consider site conditions concretely and reduce unexpected issues during construction.

Also, when partial dismantling or temporary reinforcement is required, 3D data helps clarify which parts will be interfered with and what risks are anticipated depending on work sequence. Because it is not possible to “break and then think” with cultural heritage buildings, the precision of pre-work assessments greatly affects outcomes. 3D scanning is extremely useful as supporting material to increase the density of detailed design and construction preparation.

In addition, 3D visualization created during the design stage is useful when explaining restoration policies to clients and relevant institutions. Three-dimensional visualization makes it easier for non-experts to understand situations, facilitating consensus building. Restoration of cultural heritage buildings requires not only technical validity but also recordability, public accessibility, and accountability. In this sense, 3D scanning serves as a bridge between design and explanation.

Use 4 Use it for component management and history organization

In preserving cultural heritage buildings, managing not just the whole structure but individual components and their history is a major task. Columns, beams, purlins, rafters, wall substrates, finishes, and decorative elements are among many overlapping elements that make up a building; during repairs, some parts are replaced, some are reused, and some are reinforced. If this history is not accurately organized, future repair decisions become difficult.

3D scanning is well suited to component management because it can preserve positional relationships and shapes of individual members in space. Particularly before and after dismantling repairs, it is necessary to organize which member was at which original position, what condition it was in after removal, whether it was reused, or whether it was newly replaced. If component information is linked to 3D data, it becomes easier to manage histories in three dimensions that are hard to track with drawings or ledgers alone.

For complex frameworks typical of cultural heritage buildings, 3D data also helps with numbering components and preventing misidentification. If positions and numbers are associated in three-dimensional space, it becomes easier to share information among site, factory, and recording staff, reducing confusion in work. In cultural heritage repair, handling a single member can affect overall coherence, so high precision in component management is very important.

From the standpoint of organizing histories, 3D data is effective as well. To communicate to future researchers which components or reinforcement points were added in past repairs, it is desirable to retain both location and shape information. Content that is difficult to convey through text alone becomes easier to understand when related in 3D space. If future custodians can grasp the building’s history more easily, unnecessary re-surveys or incorrect judgments can be avoided.

The value of cultural heritage buildings lies not only in their finished appearance but also in the history of which materials were used and how they have been inherited. 3D scanning is a means to organize that history as spatial information and more reliably preserve the building’s memory.

Use 5 Record the process of repair work

In repair of cultural heritage buildings, the process of the work itself—not just the completed state—is an important record. Joinery revealed only after dismantling, hidden substrates, reinforcement methods, the condition of removed members, and traces of past repairs are valuable for future repairs and academic study. However, the conditions during construction are transient and will be lost over time unless intentionally recorded.

Conducting 3D scans at key stages of the work allows the process to be recorded volumetrically. If data is captured before start, after partial dismantling, after reinforcement installation, before reassembly, and after completion, it becomes easier to organize a chronological record of what was confirmed at each point and how it was treated. This not only improves the quality of construction reports but also accumulates knowledge for future repairs.

Particularly in cultural heritage buildings, unexpected phenomena may be discovered during construction—internal decay, damage to hidden joints, presence of later additions, signs of differential settlement, and so on. If these findings are recorded only with photos and text on site, positional relationships can be hard to understand later. Organizing such findings alongside 3D data makes it clearer which parts were observed and where.

Enhanced construction records also serve accountability. Even if restoration is intended to return the building to its original state, decisions and interventions are invariably made. To enable later verification that those decisions were appropriate, recording the process is indispensable. 3D scanning helps preserve on-site conditions objectively and increases transparency of interventions.

Past construction records are also useful when restoring similar structures in the future: they make it easier to share insights about what kinds of deterioration occurred, how they were addressed, how scaffolding and temporary works were planned, and at which stages problems were likely to arise. Recording the process of repair work in 3D contributes not just to a single project but to the broader knowledge base of cultural heritage restoration.

Use 6 Use it for disaster preparedness and recovery planning

Cultural heritage buildings are exposed to various disaster risks such as earthquakes, heavy rain, strong winds, landslides, and fires. Once damage occurs, recovery planning can be hampered if the original state is not sufficiently understood. For such situations, pre-event records by 3D scanning are highly meaningful.

If the entire building is recorded in 3D during normal times, it becomes easier to compare which parts changed after a disaster. Knowing roof settlement amounts, wall tilting, ground changes around pedestals, and locations of fallen components helps determine priorities for emergency response and full recovery. Immediately after damage, safety concerns and access restrictions may prevent thorough on-site investigation, but pre-existing data can supplement decision-making.

In recovery planning, a major issue is how closely to reproduce the original form. Even when photographs leave dimensions and positional relationships ambiguous, 3D data provides a reference shape. Particularly for complex roofs, decorative parts, and interactions with surrounding terrain, volumetric records improve the accuracy of recovery planning.

Disaster preparedness also benefits from pre-event use. By understanding the terrain around the building, drainage routes, distances to retaining walls, and relationships with trees and nearby structures, 3D data is useful when assessing risk locations. Grasping not only the building but also its surroundings enables development of more practical disaster mitigation plans.

For cultural heritage buildings, waiting until after a disaster to recognize their value can be too late. Preparing records in advance functions like insurance. While 3D scanning does not prevent disasters, it is an important preparedness tool that enhances damage assessment, emergency response, and recovery planning quality.

Use 7 Deploy it for public exhibitions and educational outreach

3D scanning of cultural heritage buildings can be used not only for preservation and restoration but also extensively for public exhibitions and educational outreach. To convey the value of cultural heritage to society, records understandable only to specialists are insufficient; they must be translated into forms that general visitors, local residents, and students can grasp. In that respect, 3D data is a highly powerful resource.

For example, normally inaccessible or hard-to-see areas such as roof tops, internal attic structures, and detailed ornamentation can be visualized three-dimensionally to facilitate understanding. Structural features and characteristics that are difficult to convey with plans or specialized terminology become intuitively understandable when shown volumetrically. This is useful not only for visitor exhibitions but also as public relations materials explaining the significance of preservation projects.

3D data can also be used to visualize before-and-after restoration comparisons and the construction process. Because many of the steps in cultural heritage repair become invisible once completed, it is often hard for the public to understand what was done. Utilizing 3D data makes it easier to show where problems were and how they were addressed, which fosters public understanding of heritage preservation.

In education, 3D scanning data is valuable as well. It can be applied as learning material across fields such as architectural history, conservation and restoration, local history, landscape studies, surveying, and materials science. Even when site visits are impractical, three-dimensional data enables learning about a building’s features, expanding its potential as an educational resource. When collaborating with local schools and cultural activities, appropriate uses can lead to multifaceted outreach.

Moreover, public display of cultural heritage buildings aims not only to show but to pass down knowledge. 3D data functions as a medium for conveying the building’s value as well as recording its shape. Using data acquired for preservation to broaden social understanding and support is highly meaningful for cultural heritage initiatives as a whole.

Use 8 Streamline maintenance management and future re-surveys

Conservation of cultural heritage buildings is not completed with a single survey or repair. Rather, what matters is continuous monitoring after repairs and timely re-surveys or interventions when needed. This requires a basis for daily maintenance and medium- to long-term comparisons. 3D scanning helps build such a continuity management system.

For routine inspections, it is important not to start from scratch each time but to review changes against baseline data. If a reference 3D dataset exists, it is easier to identify which parts have changed and which remain stable. This helps focus inspection efforts, enabling efficient management even with limited staff and time.

Also, when personnel change, having preserved data makes handovers easier. Management of cultural heritage buildings tends to rely on experienced personnel, and if knowledge is confined to individuals, continuity becomes a challenge. With records including 3D data, successors can more easily understand the building’s condition and history, helping maintain management standards.

Furthermore, at future re-surveys, it becomes easier to plan where to add measurements and where changes are concentrated. Instead of conducting comprehensive surveys every time, focusing based on existing data reduces on-site burden while still obtaining necessary information. This is a practical advantage for sites constrained by budget and manpower.

The quality of maintenance management is determined by the accumulation of daily, small decisions. While 3D scanning may seem like a flashy technology, it is essentially a steady management foundation for long-term protection of cultural heritage buildings. As a connector for recording, comparison, inspection, and re-survey flows, it contributes significantly to long-term preservation.

How to proceed to successfully implement 3D scanning for cultural heritage buildings

To effectively use 3D scanning for cultural heritage buildings in practice, simply measuring is not enough. The key to success is clarifying the intended uses at the outset. Whether the purpose is preservation recording, providing material for restoration design, or use in public exhibitions will affect the required coverage, accuracy, representation method, and data organization policy. If the purpose is vague, you may unnecessarily capture overly broad areas or conversely miss required parts, resulting in deliverables that are difficult to use later.

Next, plan based on site conditions. For cultural heritage buildings, many factors affect measurement, including access restrictions, presence or absence of scaffolding, surrounding trees, sunlight conditions, indoor/outdoor light contrasts, narrow spaces, and reflective materials. By organizing the target range and priority areas in advance and planning the acquisition sequence, you can reduce omissions on site.

Post-acquisition data organization should not be overlooked. In cultural heritage practice, information prepared in a form that stakeholders can interpret is more important than raw acquired data. Consider how to organize required cross-sections, elevations, annotations, damage locations, and component information, and in what media they will be shared. Because different users—drawing staff, restoration staff, survey staff, and management staff—want different information, designing deliverables is crucial.

A storage policy oriented toward future use is also necessary. 3D data is large in volume and comes in various formats, so without consideration for long-term storage and reuse, valuable data can become buried. Organizing data names, acquisition dates, target ranges, coordinate and reference information, and correspondence with related documents helps when conducting future re-surveys.

Moreover, 3D scanning does not stand alone; it attains its true value when combined with photographs, drawings, written records, damage surveys, and component ledgers. Preservation of cultural heritage buildings is multifaceted work, and no single recording method can substitute for all others. While centering on 3D scanning, consider how it will interoperate with other records—this is practically very important.

Summary

3D scanning of cultural heritage buildings should be positioned not as mere adoption of advanced technology but as an information platform that supports preservation, restoration, public display, and maintenance management in an integrated way. Starting with three-dimensional recording of the current condition, it demonstrates practical value across a wide range of situations: understanding deformation and deterioration, supporting restoration design, organizing component histories, recording construction processes, aiding disaster recovery, enabling public use, and facilitating long-term maintenance.

For targets like cultural heritage buildings that are highly individual, difficult to redo, and require long-term preservation, how accurately the current state is recorded will influence future decisions. 3D scanning not only records forms at a given time with rich information, but also provides a basis for future comparison, interpretation, explanation, and inheritance. Especially in heritage contexts with many stakeholders and long-term management, the value of easily shared volumetric information will only increase.

However, to maximize outcomes, it is indispensable to clarify why data is being acquired, determine the required accuracy and scope, and plan through to post-acquisition organization and storage. Rather than indiscriminate 3D capture, it is important to consider 3D utilization grounded in preservation practice. Doing so allows 3D scanning to become not merely a recording task but a practical means to protect, convey, and connect the value of cultural heritage buildings to the future.

Finally, to make 3D scanning of cultural heritage buildings useful in the field, it is important not only to capture the building geometry but also to organize external spatial information such as reference point verification, position sharing, and surrounding conditions. If you want to make survey and maintenance workflows more practical, consider combining mechanisms like LRTK—an attachable smartphone GNSS high-precision positioning device—to improve on-site positional accuracy and work efficiency. Considering 3D scanning and position information management together will strengthen future practical preservation of cultural heritage buildings.