As-Built Drawings from a LiDAR Scanner

As-Built Drawings from a LiDAR Scanner

Turning reality capture into reliable documentation for the building industry

In modern construction, as-built drawings are no longer a “nice to have” at the end of a project. They’re critical for compliance, future upgrades, maintenance and dispute resolution. The problem is that traditional as-built drawings often rely on red-pen markups, partial measurements and rushed updates done after practical completion.

LiDAR scanning changes this completely. By capturing millions of accurate points in a matter of minutes, a LiDAR scanner allows engineers and drafters to create as-built drawings that reflect the real, built condition – not what was on the original design.

Hamilton By Design uses 3D LiDAR scanning to generate accurate as-built drawings from a LiDAR scanner, giving builders, architects, engineers and asset owners a defensible digital record of their building or plant.

What are as-built drawings from a LiDAR scanner?

As-built drawings from a LiDAR scanner are:

  • 2D plans, sections and elevations
  • 3D models and details
  • derived directly from a registered point cloud captured on site.

Instead of manually measuring walls, slab set-outs, penetrations and services, a LiDAR scanner records the whole space. The point cloud is then brought into CAD (e.g. SolidWorks, Revit or other platforms), where key elements are modelled and documented.

Typical outputs include:

  • Architectural as-builts (floor plans, elevations, reflected ceiling plans)
  • Structural as-builts (columns, beams, slabs, penetrations, bracing)
  • Services as-builts (pipework, ductwork, cable trays, equipment locations)
  • Detailed shop drawings for plant rooms and complex interfaces

How the workflow works

  1. LiDAR scanning on site
    • Rapid capture of internal and external spaces
    • Minimal disruption to trades and building users
    • Safe access to congested or hard-to-reach areas
  2. Point cloud registration and cleaning
    • Multiple scans stitched together into a single, accurate model
    • Aligned to site control or building grid where available
  3. 3D modelling and drafting
    • Critical building elements are modelled from the point cloud
    • As-built geometry is used to produce 2D drawings and 3D models
  4. Issue of as-built drawing pack
    • PDF drawings for records and certifications
    • DWG / RVT / STEP or other formats for future projects
    • Optional viewer files so non-CAD users can navigate the 3D data

Pros of as-built drawings from a LiDAR scanner

1. High accuracy and completeness

  • Millions of measurement points capture true geometry, not assumptions.
  • Complex areas – plant rooms, risers, ceiling spaces – are fully documented, not just partially measured.

2. Reduced rework and disputes

  • Clear evidence of what was built supports defect resolution and variation claims.
  • Future contractors design to real as-built conditions, reducing clashes and site modifications.

3. Faster capture on busy sites

  • Scanning is quick compared to manual measurement.
  • Ideal for constrained programmes and after-hours access windows.

4. Better coordination between disciplines

  • Structural, architectural and services teams can all reference the same point cloud and models.
  • Less “finger-pointing” when drawings don’t match what’s on site.

5. Stronger compliance and asset management

  • As-built drawings support building approvals, fire safety certification and ongoing maintenance planning.
  • Facility managers gain a digital baseline for future upgrades.

Cons and limitations to consider

1. Not every point needs to become a line

LiDAR creates very detailed data. If over-modelled, projects can waste time modelling elements that don’t impact decisions. The key is to define what actually needs to be modelled for compliance, maintenance and future work.

2. Line-of-sight constraints

Scanners work on line-of-sight. Hidden voids, behind-ceiling spaces or crowded areas may still need additional access or targeted scans.

3. File sizes and hardware requirements

Point clouds can be large and require good hardware and workflows. We manage this for you, but project teams need suitable software or viewer tools if they want to work directly with the cloud.

4. Upfront cost vs basic markups

LiDAR-based as-builts cost more than simple red-pen drawings. However, they usually save money by reducing rework, clarifying liability and avoiding surprises on the next project phase.

What LiDAR technology offers the building industry beyond as-builts

LiDAR scanning doesn’t just create better as-built drawings. It unlocks a broader digital toolkit for the building and construction industry.

1. BIM and clash detection

  • Point clouds can be used to validate BIM models, ensuring they match reality.
  • New designs can be checked against the as-built point cloud to spot clashes before anything is fabricated.

2. Digital QA and dimensional control

  • Verify column locations, slab levels, penetrations and set-outs against design tolerances.
  • Check fabricated elements (stairs, walkways, modules) against the point cloud before shipping to site.

3. Refurbishment and fit-out planning

  • Ideal for refurbishing existing buildings, heritage structures and occupied spaces.
  • Designers can test options in 3D, knowing the geometry reflects the real building.

4. Facilities management and digital twins

  • As-built models become the foundation for digital twin environments.
  • Facility managers can track assets, plan maintenance and visualise future upgrades in context.

5. Heritage documentation and risk management

  • Non-intrusive capture of historic facades and interiors.
  • Provides a permanent digital record if damage, fire or future alterations occur.

6. Off-site fabrication and modular construction

  • Accurate as-built geometry allows stair cores, plant skids and façade elements to be prefabricated with confidence.
  • Better fit-up on site, fewer hot-work modifications and reduced time at height.
Hamilton By Design logo displayed on a blue tilted rectangle with a grey gradient background

Why work with Hamilton By Design

Hamilton By Design combines LiDAR scanning, 3D modelling and engineering into one integrated service:

  • We understand both building and industrial environments.
  • We work with architects, builders, engineers and asset owners.
  • We tailor the level of as-built detail to what your project actually needs.

Whether you’re closing out a project with reliable as-built drawings, planning a major refurbishment, or laying the groundwork for digital twins, as-built drawings from a LiDAR scanner provide a precise, future-proof record of your building.

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