As-Built surveys capture precise measurements and conditions of a building or structure, resulting in detailed drawings or models that architects use as the foundation for their remodel or renovation designs.
For a reliable deliverable, As-Built providers should combine state-of-the-art tools, 3D scans, detailed photos, expert-level surveyors, and quality control. To get the most out of your As-Built survey, it’s important to understand how it’s conducted and why partnering with an experienced, professional provider is beneficial.
In this article, we explain what an ideal As-Built survey consists of and why it’s important to your project’s success.
What Is an As-Built Survey?
An As-Built survey is the process of measuring an existing building. At PPM, we measure the inside and outside of a building using laser scanners powered by LiDAR technology, then create 2D drawings or 3D models showing the exact dimensions and layout. Architects, engineers, designers, and construction professionals use these drawings and models as the foundation of their residential and commercial remodel projects.
The As-Built survey is the first part of the two-step process that makes As-Built plans possible, and it is all about accurately gathering measurement or placement data. The second part, or the companion of As-Built surveys, is As-Built plans, which are a communication of the data from the survey as clearly and concisely as possible.
Other terms and spellings for As-Built surveys include:
- Site Survey
- Existing Conditions Drawings
- Record Drawings
- Measured Drawings
- Asbuilt (Asbuilt Drawings, Asbuilt Plans, Asbuilt Survey)
- As-Build or Asbuild (Drawings, Plans, Survey)
As-Built vs. Construction Drawings: Understanding the Difference
While As-Built drawings and construction drawings share some similarities, they differ in important ways.
Construction drawings are the initial blueprint that show the design intent, or what will eventually be built. On the other hand, As-Builts reflect the actual built condition of a structure as it currently exists.
| As-Built Drawings | Construction Drawings |
| Depict the existing state | Depict the future state |
| Document the built environment | Translate design intent |
Why As-Built Surveys Are Key to Project Success
An accurate As-Built survey lays the foundation for quality design, smoother collaboration, and fewer issues across all phases of a project. When you have an accurate picture of an existing structure, your team can make better decisions, streamline next steps, and reduce costs.
Here’s how As-Built surveys can help:
- Design future remodels and support future maintenance: Plan remodels, expansions, or system upgrades without any guesswork. Contractors or facility managers can use this information to locate utilities, maintain systems, or understand any spatial constraints.
- Verify accuracy: When you confirm that what’s on paper matches what exists in the built environment, you can discover discrepancies and avoid rework, while ensuring compliance with both building codes and client needs.
- Document major and minor mid-project changes: Even small adjustments can impact downstream work. As-Built documentation lets you track these updates in real time so you can ensure the final deliverable accurately reflects all changes.
- Improve collaboration for stakeholders: A single source of truth benefits architects, contractors, owners, and engineers. Everyone references the same information, strengthening communication and reducing misunderstandings.
How To Conduct an Accurate As-Built Survey
The As-Built process involves conducting a survey of the existing conditions to create accurate and detailed As-Built drawings. This process involves using 3D laser surveying technology, like LiDAR and traditional measurement strategies. LiDAR technology uses lasers to measure distances with high levels of accuracy, precision, and efficiency.
However, the traditional measurement strategies involve physically measuring the space using tape measures, laser distance meters, and sketching.
Whichever method you choose, the process follows these basic steps:
- Planning: Review the project scope, determine the measurement strategy, decide which tools and methods to use, and set a path to capture all necessary areas.
- Measuring: Capture measurements of surfaces using digital or manual tools and take photos of the site for reference.
- Process data and draft models: Import the As-Built measurements and scans into ReCap. Once processed, use the data in software like AutoCAD, Revit, Archicad, or SketchUp to create drawings or models.
- Quality review: Check that the survey is accurate and the data aligns with the building’s real conditions.
- Delivery: Produce a comprehensive deliverable package incorporating drawings, models, and images.
At PPM, we ensure strong alignment between our photos, 3D scans and final deliverables before handing everything to our QA and Audit teams. Because of this detailed process, surveyors and drafters can work seamlessly across projects, supporting consistency and quality from start to finish.
How a Professional As-Built Surveyor Helps Improve Accuracy and Efficiency
Accurate As-Built documentation helps reduce project delays and additional coordination. Precision is especially important when capturing complex spaces or when measurements must be validated before design begins. Because of this, many teams rely on surveyors with strong technical training, established workflows and reliable measurement tools.
Technical Expertise
Achieving a high level of accuracy depends on both experience and structured training. PPM’s surveyors bring decades of combined field experience and complete more than 200 hours of formal training to support consistency across projects. Our team completes thousands of surveys annually, reinforcing familiarity with a wide range of building types and site conditions.
Quality Control
To support accuracy, PPM surveyors combine laser scans, manual verification and comprehensive site photos. All captured data is reviewed before leaving the site, then submitted for internal QA review, where it is checked for completeness and alignment. Throughout the process, clients receive proactive communication and support.
Measurement Tools
LiDAR, the laser scanning technology that captures 3D point clouds, can achieve an accuracy rate of 0.5 to 10mm. It’s faster and more accurate than traditional measurement strategies. For example, LiDAR can measure an entire commercial floor in just minutes, capturing everything with extreme accuracy.
PPM uses the most up-to-date As-Built surveying technology and software, including:
- Leica RTC360
- Leica BLK2GO
- FARO Orbis
- GeoSLAM Zeb Horizon RT
- ReCap
- AutoCAD
- Revit
- Archicad
- SketchUp
Align Your Vision to Reality With Industry-Leading As-Built Surveys
Scanning your project helps prevent costly revisits and reduces the amount of time spent on site. If you’re seeking an As-Built provider with structured workflows and reliable support, PPM offers efficient processes that help set you up for success throughout every phase of your project.
Get your quote today if you’re interested in a better plan for your As-Builts.
Frequently Asked Questions
When Do I Need To Conduct an As-Built Survey?
You should conduct an As-Built survey whenever you plan to remodel, update, or expand your space. As-Built surveys are also crucial when verifying plans against existing conditions, ensuring compliance, or providing documentation for future projects. For instance, if you plan to remodel a home, you should conduct a residential As-Built survey.
What Are Common Mistakes Made During As-Built Surveys?
Common challenges can include missing measurements, lack of contextual documentation such as photos or sketches, or relying on outdated plan sets that no longer reflect the current site. Accuracy improves when surveys are conducted by experienced professionals using structured workflows and modern tools.
What Makes an As-Built Survey Accurate?
An accurate As-Built survey includes precise measurement tools, comprehensive documentation, and expert surveyor knowledge. Quality checks and cross-referencing with other documentation such as images and sketches help ensure nothing is being overlooked.
Adhering to the “Level of Accuracy” standards as outlined by the US Institute of Building Documentation and integrating advanced technology can help achieve top accuracy. When considering As-Built survey providers, look for those with strong expertise and a dedication to accuracy.