How point cloud scanning cut our client's rework costs by 34%
Key takeaways
- Point cloud scanning replaces the measured survey on refurbishment projects, so the design team works from measured reality instead of record drawings.
- On a comparable Dublin retrofit, scanning reduced design-stage rework from €184,000 to €121,000 — a 34% saving.
- Budget 0.6% to 1.2% of construction cost for a point cloud survey on a refurbishment project.
- Most of the saving comes from accurate riser and slab-edge geometry feeding straight into the structural model.
Reality capture has moved from optional extra to baseline expectation on Irish refurbishment projects. We were brought in by a Dublin-based developer to scan a 4,200m² 1970s office block ahead of a stripped-back retrofit. The brief was straightforward: deliver a Revit-ready as-built model the design team could trust.
Two RTC360 scanners, 162 set-ups and three nights of after-hours work later, we registered a 12mm-accurate point cloud and turned around a federated as-built within 12 working days.
The numbers tell the story. The previous similar project — surveyed by traditional measured-survey methods — racked up €184,000 in design-stage rework due to discrepancies discovered on site. Our point cloud-driven model brought that number down to €121,000 on a comparable scope, a 34% reduction. Most of the saving came from accurate riser and slab edge geometry feeding straight into the structural model.
If you're considering reality capture for an upcoming refurbishment, the rough rule of thumb is this: budget 0.6% to 1.2% of construction cost for a point cloud survey, and expect a 5 to 8 times return on rework alone — before you count the programme savings.
How to brief a scan so the saving is real
The saving does not come from the scan itself — it comes from the model built on top of it. A point cloud that nobody converts into usable geometry is an expensive archive. Before commissioning, agree what the deliverable actually is: a registered cloud for reference, an as-built Revit model at a stated level of detail, or both.
Be specific about what must be captured. Ceiling voids, risers and plant rooms are where retrofit projects go wrong, and they are also the areas most likely to be skipped if access is awkward on the day. A scan that misses the riser is the one that costs you later.
When scanning does not pay for itself
Scanning is not automatically the right answer. On a new-build greenfield site there is nothing to capture. On a simple building with reliable, recent record drawings and generous tolerances, a conventional measured survey may cost less and answer the question adequately.
The test is the cost of being wrong. Where existing conditions are uncertain and the consequence of a discrepancy is structural rework or a programme delay, the survey is cheap insurance. Where the consequence is a repositioned partition, it may not be.
Frequently asked questions
- Does a point cloud survey replace a topographic or boundary survey?
- No. A point cloud survey captures the built fabric, not legal boundaries or levels tied to a national datum for planning purposes. Those remain the work of a chartered land surveyor, though scan data can be registered to the same coordinate system.
- How soon in a project should scanning happen?
- As early as possible, ideally before concept design is fixed. The value of measured data falls sharply once the design team has committed to an arrangement that assumed something different.
- Can a point cloud be used for a building that is still occupied?
- Yes. Occupied buildings are scanned routinely, usually after hours or at weekends so sight lines are clear and occupants are not disrupted.