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Guide to As-Built Surveys: What You Need to Know

Learn the basics of as-built surveys, including their purpose, how they are conducted, and their importance in construction and property management.

Article By: Tom Ayre
Last Update: July 2024

Introduction

An as-built surveys (sometimes known as measured surveys) are a critical component in construction and engineering projects, providing an accurate representation of a structure or site as it exists post-construction.
 
Unlike initial design plans, as-built surveys document any modifications made during the building process, ensuring that the final construction aligns with the approved plans. This blog post explores the significance, process, and benefits of as-built surveys.
An example measured survey floor plan drawing.

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Table of Contents

What is an As-Built Survey?

An as-built survey (sometimes known as measured survey)  is a detailed record of the actual dimensions, geometry, and location of all elements in a constructed project. It captures changes from the original design and ensures compliance with the planned specifications.

As-built surveys are essential for verifying that a project has been completed according to the design, helping to identify discrepancies and ensuring compliance with regulatory standards.

Example Types of As-Built Drawings

Floor Plans

  • Description: Floor plans are horizontal representations of the layout of each level of a building, showing the arrangement of rooms, walls, doors, windows, and other architectural elements from a bird’s eye view.
  • Uses: Essential for space planning, furniture layout, and understanding the overall flow and functionality of a building’s interior spaces.

Sections

  • Description: Sections are vertical cuts through a building, providing a view of the internal structure and detailing the relationships between different floors, walls, and ceilings.
  • Uses: Crucial for understanding the building’s vertical dimensions, construction details, and the integration of various structural and mechanical systems.

Elevations

  • Description: Elevations are flat representations of a building’s exterior and interior walls, showing details such as windows, doors, finishes, and external architectural elements.
  • Uses: Important for visualizing the external appearance of the building, planning exterior renovations, and ensuring aesthetic consistency.

Site Plans

  • Description: Site plans illustrate the overall layout of a building within its environment, including property boundaries, landscaping, driveways, walkways, parking areas, and other site features.
  • Uses: Vital for land development, landscape planning, and ensuring compliance with zoning regulations and environmental considerations.

Roof Plans

  • Description: Roof plans provide a top view of the roof structure, showing the layout of all roof elements such as ridges, valleys, slopes, drainage systems, and roofing materials.
  • Uses: Necessary for roofing projects, maintenance, and ensuring proper water drainage and structural integrity of the roof.

Reflected Ceiling Plans (RCP)

  • Description: Reflected ceiling plans depict the ceiling layout as if it were reflected onto the floor, showing the placement of lighting fixtures, HVAC elements, ceiling finishes, and other overhead components.
  • Uses: Used for lighting design, ceiling installation, and coordination of overhead systems in relation to the overall interior design.
An example measured survey floor plan drawing.
As-Built Drawing Example

Types Of As-Built Surveys

  • Architectural Measured Surveys: Focus on the building’s physical characteristics such as walls, floors, and ceilings.
  • MEP Surveys: Document mechanical, electrical, and plumbing systems within the building.
  • Structural Surveys: Concentrate on structural elements like beams, columns, and foundations.
  • Topographical Site Surveys: Include exterior features such as landscaping, parking areas, and access roads.

How is an As-Built Survey Conducted?

  • Planning: Initial phase involves scoping the project, gathering existing documentation, and coordinating with stakeholders.
  • On-Site Work: Surveyors measure all surfaces and conditions using advanced tools like 3D laser scanners to ensure high accuracy.
  • Data Processing: Collected data is processed using software to create detailed as-built drawings or 3D BIM models.
  • Drafting and Review: Drafts are created and reviewed for accuracy by the survey team and site personnel.
  • Delivery: Final documents are delivered to stakeholders for future reference and use.
A total station being used on a beach in Jersey.
Topographical survey in Jersey.

Benefits of As-Built Surveys

As-built surveys ensure the project adheres to design specifications and regulatory requirements, providing a high level of accuracy and compliance. They offer detailed information useful for future maintenance, renovations, and upgrades.

With accurate as-built surveys, potential issues can be identified early, saving time and costs related to corrections and modifications. Furthermore, as-built surveys assist in effective management and valuation of properties by providing precise details about the constructed asset.

Challenges of As-Built Surveys

Conducting as-built surveys requires expertise and advanced technology to capture accurate data, making the process technically complex. These surveys can also be time-consuming and costly, especially for large and complex projects. Surveyors often need to work in challenging conditions to gather data, which can pose safety risks.

The Future Of As-Built Surveys

The integration of Building Information Modelling (BIM), 3d laser scanning, and mobile computing is revolutionising the accuracy and efficiency of as-built surveys. The concept of creating digital replicas of physical assets using as-built data, known as digital twins, is becoming more prevalent, enhancing project management and future planning.

Conclusion

As-built surveys are indispensable in the construction industry, providing an accurate record of the built environment. They play a crucial role in ensuring project compliance, facilitating maintenance and renovations, and supporting informed decision-making. As technology continues to advance, the processes and benefits of as-built surveys will only improve, making them an essential tool for construction and engineering professionals.

An example measured survey floor plan drawing.

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  • Relied on by Architects, Engineers and Designers.
  • Quick Turnarounds, Great Customer Service
  • 5 Star Reviews on Google & Trustpilot.
SEE OUR MEASURED BUILDING SURVEY SERVICE

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