Catching What the Eye Misses: LiDAR-Assisted Progress Verification for a 10-Storey Office Build
When a construction team needed confidence that their build matched the design intent, AXYZ Solutions flew a drone-mounted LiDAR payload around the structure — and surfaced deviations before they became rework problems.
Construction is precise work. Verification usually isn't.
For large-scale structural builds, the gap between what was designed and what was built often only surfaces during handover — or worse, after occupancy. Traditional site inspections rely on manual measurements, visual walkthroughs, and spot checks. For a 10-storey reinforced concrete office building mid-construction, that approach leaves too much to chance.
The project team came to AXYZ Solutions with a straightforward need: they wanted an objective, data-driven snapshot of their as-built structure, checked against their BIM model, to validate progress and catch anything that had drifted from spec.
"You can walk a floor and feel confident about it. But you can't walk 10 storeys of a building and simultaneously compare every column, wall, and slab edge to a millimetre-accurate 3D model. That's where we come in."
Our Approach
A single flight. A complete spatial record.
AXYZ Solutions deployed a drone equipped with a LiDAR payload to carry out a full exterior scan of the building under construction. Rather than a static ground-level survey, the aerial approach gave us unobstructed coverage of every facade, floor slab edge, column alignment, and structural element from foundation level to the topmost floor.
Aerial LiDAR capture
The drone orbited the 10-storey structure in a systematic flight pattern, collecting dense point cloud data from multiple angles. LiDAR pulses captured surface geometry accurate to within centimetres across the full building envelope.
Point cloud registration and clean-up
Raw scan data was processed and registered into a unified, geo-referenced point cloud — a precise digital replica of the structure as it stood on the day of the flight.
BIM overlay and deviation analysis
The client's existing BIM model was aligned to the as-built point cloud. A deviation analysis was performed to identify and quantify areas where the physical structure diverged from the design intent.
Findings report and delivery
A structured findings report was prepared for the project team, highlighting specific zones of concern with visual evidence, deviation measurements, and contextual notes — ready for immediate review with the site and design teams.
What We Found
Deviations that manual checks had missed.
The point cloud-to-BIM comparison revealed a number of areas where the as-built structure had drifted from the design. None of these were catastrophic on their own — but left undetected, they could have created compounding issues further into the build or during fit-out.
Structural offsets detected
Certain columns and wall planes were found to sit outside their designed position tolerances, flagged for structural review.
Floor slab edge variances
Slab overhangs on select floors showed dimensional variance relative to the BIM, impacting curtain wall and facade alignment planning.
Overlooked zones surfaced
The aerial vantage uncovered elements at upper floors not accessible by ground inspection and not previously reviewed.
BIM-to-reality gap quantified
For the first time, the project team had a measurable, documented record of build accuracy — turning assumptions into evidence.
The Outcome
From uncertainty to actionable clarity.
Armed with the AXYZ Solutions scan report, the project team was able to immediately prioritise the flagged areas for review — routing findings to the relevant structural and M&E consultants for assessment. The client noted that several flagged zones were not on their active inspection list and would not have been caught through their existing QA workflow.
The value was not just in what was found, but in what was ruled out: for the majority of the structure, the scan confirmed conformance with the BIM, giving the team documented confidence to proceed with downstream works.
"The scan gave us a view of our building we'd never had before — not just what it looks like, but how it compares to what it's supposed to look like."
— Project team feedbackWhy It Matters
Progress verification is quality assurance at scale.
Construction projects don't fail at handover. They accumulate small deviations across hundreds of decisions, pours, and placements — each individually minor, but cumulatively significant. Drone-based LiDAR scanning transforms progress verification from a periodic manual check into a spatially complete, repeatable, and documentable process.
For developers, main contractors, and project managers who want to close the gap between design intent and built reality — before the windows go in and the ceilings go up — this is how it's done.
Ready to verify your build?
Get in touch to discuss a progress verification scan for your active construction project.
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