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What Are As-Built Drawings?


In the fast-paced world of construction, precision and accuracy are of the highest value. Imagine investing significant time and resources into a construction project, only to discover discrepancies between the original plans and the final structure. These inconsistencies not only pose logistical challenges but can also lead to costly delays and issues.

In this article, Alex Yuriy Kulchitsky, Head of VDC Services at Alterpex, will discuss the critical role of As-Built drawings in construction, their key role in preventing costly errors, and how they can contribute to effective project management.

What Are As-Built Drawings?

As-Built Drawings are comprehensive documents that depict the final, constructed state of a building or infrastructure project. They serve as a record of the actual dimensions, locations, and specifications of all components of the project as they were built, as opposed to the original design plans. These drawings are typically created after the construction process, often by surveying the completed structure and documenting any deviations from the original plans, or before the construction to collect the existing conditions to start a remodeling process.

Their main purpose is to provide an accurate representation of the built facility for various stakeholders, including architects, engineers, contractors, and future maintenance personnel.

As-Built Drawings Services are professional offerings that focus on documenting and representing the actual constructed state of a structure. These services involve the creation of detailed drawings or plans that accurately depict the actual dimensions, configurations, and specifications of the completed project.

Importance of Detailed Documentation

· Ensuring Accuracy. As-built drawings play a crucial role in ensuring accuracy during the construction process. They provide a detailed representation of the final structure, including any modifications made during construction.

· Compliance Verification. These drawings are essential for verifying compliance with building codes and regulations. They serve as a reference point for inspectors to ensure that the constructed building meets all necessary requirements.

· Future Maintenance. Detailed documentation in the form of as-built drawings is invaluable for future maintenance and renovations. It provides a clear understanding of the building’s components, making it easier to identify issues and plan repairs.

· Cost Savings. One significant benefit of detailed documentation through as-built drawings is cost savings. By having precise records of the construction process, potential errors or discrepancies can be identified early, preventing costly rework later on, as well as playing a huge part in scheduling and ordering construction materials.

Key Components of As-Builts

The key components of As-Builts encompass various elements that are essential for accurately documenting the final stage of a construction project. These components provide a comprehensive understanding of the as-built condition of the structure and serve as valuable reference documents for future use. Some of the key components include:

1. Layout and Dimensions. As-Builts include detailed floor plans, elevations, and sections that depict the layout and dimensions of the completed structure. This includes the positioning of walls, doors, windows, and other architectural elements.

2. Structural Details. As-Builts provide information about the structural components of the building, such as beams, columns, and foundations. This includes details about their dimensions, materials, and framing members’ layout.

3. Mechanical, Electrical, and Plumbing (MEP) Systems. As-Builts document the placement and specifications of MEP systems, including heating, ventilation, air conditioning (HVAC), electrical, plumbing, and fire protection systems.

4. Utilities and Infrastructure. As-Builts include information about the location and layout of utilities and infrastructure elements, such as water lines, sewer systems, electrical transformers, and communication networks.

5. As-Built Notes and Annotations. As-Builts may include notes and annotations that provide additional context or clarification about specific aspects of the construction project. This can include information about changes made during construction, deviations from the original plans, or maintenance requirements.

Overall, the key components of As-Builts work together to create a detailed and accurate representation of the completed construction project, serving as invaluable reference documents for architects, engineers, contractors, and facility managers.

Strategies for Effective As-Builts

1. Accurate Documentation. As-built drawings need to reflect the actual conditions of a project without any alterations or assumptions. They should capture precise measurements and details to ensure accuracy.

2. Regular Updates. Frequent updates to as-built drawings are crucial to maintain current information. Regular revisions help prevent discrepancies between the initial plans and the final construction.

3. Collaboration Among Teams. Effective communication and collaboration among various teams involved in a project are essential for creating accurate as-built drawings. This ensures that everyone’s input is considered.

4. Utilizing Technology. Leveraging advanced software tools can streamline the process of creating as-built drawings. These tools enable efficient data collection and integration, leading to more precise documentation.

5. Quality Control Measures. Implementing quality control measures throughout the project guarantees that the final as-built drawings are comprehensive and error-free. Regular checks help identify and rectify any discrepancies.

6. Detailed Annotations. Including detailed notes in as-built drawings provides additional context for future reference. Clear annotations help users understand specific components or modifications made during construction.

Who Needs As-Built Drawings?

· Architects and Engineers. Architects and engineers rely on as-built drawings to ensure that the constructed building matches the original design specifications. These professionals use these drawings to verify dimensions, materials, and structural elements.

· Construction Companies. Construction companies utilize as-built drawings for documentation and future reference. These drawings help in understanding the building’s layout, utility locations, and any modifications made during construction.

· Building Owners. Building owners find as-built drawings crucial for renovations, repairs, or expansions. These drawings provide detailed information about the building’s structure and systems.

· Facility Managers. Facility managers use as-built drawings to maintain and operate buildings efficiently. These drawings assist in space leasing, and locating critical infrastructure components like electrical panels, plumbing systems, and HVAC units.

Using 3D Scanning for As-Builts

When it comes to documenting the final state of a construction project, traditional methods often fall short in capturing every intricate detail. This is where the revolutionary technology of 3D laser scanning steps in, transforming the landscape of As-Built Drawings with unparalleled efficiency and precision. This cutting-edge technology utilizes advanced laser beams to meticulously capture the as-built environment, creating highly accurate and detailed representations with astonishing speed. Each scan comprehensively captures the spatial data of the structure, including its dimensions, configurations, and even the finest nuances of its surroundings.


1. High Precision and Accuracy: 3D scanning produces highly accurate and detailed representations of the built environment, capturing even the smallest details with precision.

2. Efficiency: Compared to manual surveying methods, 3D scanning is much faster and more efficient, reducing the time and labor required to capture as-built data, and also eliminating the human mistake risk.

3. Comprehensive Data Capture: 3D scanning captures a vast amount of data in a single scan, including spatial information about the entire structure and its surroundings.

4. Versatility: 3D scanning can be used to capture data both indoors and outdoors, making it suitable for a wide range of construction projects, including buildings, infrastructure, and landscapes. \

5. Integration with BIM: 3D scanning data can be seamlessly integrated into Building Information Modeling (BIM) software, allowing for the creation of highly accurate and detailed digital models of the as-built environment.

6. Visualization and Analysis: 3D scanning data can be used for visualization and analysis purposes, enabling stakeholders to explore and analyze the as-built environment in detail.

Throughout this article, we’ve delved into the significance and intricacies of As-Built Drawings, uncovering their role as invaluable tools for architects, engineers, contractors, and facility managers.

About Alterpex:

Alterpex offers As-Built services and architectural drafting services in California. They focus on creating high-quality plans that are tailored to each client’s needs. By prioritizing accuracy and using the latest technology, Alterpex provides detailed plans to a wide range of clients across the state.


Yuriy Alex Kulchytsky

Head of VDC Services from Alterpex

1027 Wilshire Blvd, Suite 844, Los Angeles, California 90017

Email: [email protected]

Phone: (415) 696-4180

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