What Pre-Line Scanning Is
3D pre-line scanning captures a building at the stage after framing, wiring, plumbing, and ducting are installed but before insulation and wall linings cover them. Using Matterport cameras that combine 360-degree photography with infrared and LiDAR scanning, the process creates a navigable virtual tour of the complete building at that moment — every pipe run, wire, blocking piece, and structural element recorded in high definition with full dimensional data attached.
The concept is familiar internationally but has been slow to reach New Zealand’s residential construction sector. Rob Horrocks, a certified plumber, drainlayer, and gasfitter who founded Auckland-based 3D Three60, identified the gap and built a commercial service around it. His trades background gives him specific knowledge of what needs to be captured and from which angles — the placement of scan points across a site requires understanding what future architects, builders, and tradespeople will need to see.
Why It Matters for Builders
The practical value of pre-line scanning operates across three time horizons:
During construction: architects, engineers, and project managers can inspect site progress remotely, conducting quality assurance from their offices without travelling to site. Measurements can be taken directly from the virtual model — verifying pipe locations, confirming structural details, and checking clearances without requiring anyone to be physically on site at the same time.
At practical completion: the scan provides indisputable evidence of what was installed and where. For disputes about workmanship, compliance, or defect claims, a high-definition dimensional record of the completed framing and services stage is considerably more useful than photographs taken at various angles. The scan records the full building, not selective areas.
For future work: any alteration, extension, or repair work on the building benefits from knowing exactly where pipes, wires, and structural elements are located. Hitting a water pipe or live electrical cable when cutting into a wall is an expensive and potentially dangerous mistake; a pre-line scan makes it avoidable.
The Compliance and Self-Certification Context
As New Zealand moves toward self-certification for trusted builders, comprehensive pre-line scan records take on additional significance. A builder who can provide a complete dimensional record of services installation — showing exactly what was done and where — has a stronger basis for self-certification than one relying on photographs and memory. The scan does not replace inspections; it complements them with a level of documentation that conventional inspection processes do not generate.
3D Three60 is based in Auckland but operates nationally on request. The company is offering each new 2025 customer a complimentary Meta Quest 3S VR headset, enabling clients to experience their building’s pre-line scan in full immersive 3D — making the technology accessible and engaging for clients who are not accustomed to working with virtual models.
