As-Built Drawings, also known as Record Drawings or Red-Line Drawings, are a set of construction drawings that document the precise location, type, and configuration of various elements, including underground utilities, after they have been installed. These drawings serve as a record of the final state of the project, capturing any modifications or changes made during construction.

Here are some key points about As-Built Drawings:

1. Purpose: The primary purpose of As-Built Drawings is to provide an accurate representation of the physical characteristics of a construction project after its completion. They serve as a reference for future maintenance, repairs, and expansion projects.
2. Documentation: As-Built Drawings are typically prepared by the contractor or subcontractors responsible for the installation of various components, such as utility lines, plumbing, electrical systems, and other underground infrastructure. These drawings reflect the actual dimensions, locations, and details of the installed elements.
3. Modifications and Changes: During the construction process, it is common for modifications and changes to be made to the original design plans. As-Built Drawings capture these alterations, allowing stakeholders to understand the final layout of the project and any deviations from the initial design.
4. Accuracy and Precision: As-Built Drawings require a high level of accuracy and precision. They should reflect the actual measurements taken on-site to ensure that future work, repairs, or maintenance activities can be performed accurately without causing any damage to existing infrastructure.
5. Components of As-Built Drawings: As-Built Drawings include a variety of information, such as the exact locations of underground utilities (such as water lines, sewer lines, gas lines, etc.), dimensions, elevation changes, materials used, and any other relevant details. They may also incorporate notations, annotations, and callouts to highlight specific changes or discrepancies.
6. Integration with Design Drawings: As-Built Drawings are often created by marking up the original design drawings (referred to as “Red-Lining”) to indicate the changes made during construction. The modifications are typically shown using different colored lines or annotations, distinguishing them from the original design.
7. Legal and Regulatory Compliance: As-Built Drawings are essential for meeting legal and regulatory requirements. They can be used to verify that the constructed project aligns with the approved permits, codes, and regulations.
8. Maintenance and Future Planning: As-Built Drawings are valuable resources for ongoing maintenance and future planning. They help facility managers and engineers understand the layout of utilities and infrastructure, enabling them to perform accurate assessments, plan repairs or modifications, and make informed decisions.

In summary, As-Built Drawings are construction drawings that accurately document the final state of a project, including the precise location, type, and configuration of underground utilities and other elements. They serve as a record of modifications made during construction and provide crucial information for future maintenance, repairs, and expansion projects.