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Heritage Building Survey

As-built CADDeliverable
±2 mmAs-built accuracy

The situation

Heritage structures rarely have accurate original drawings to renovate against — settlement, old repairs, and construction-era tolerances all drift from whatever was originally drawn. Closing that gap, for this historic masonry building, had to happen before renovation planning could even start.

The approach

Capture ran at the same accuracy standard as any modern structure — Total Station control network, FARO point cloud — but with closer attention than usual to the irregular masonry surfaces and non-orthogonal walls a purely CAD-drafting approach tends to smooth over. Overlaying the resulting point cloud against a colored BIM floor plan let the renovation architects compare the two directly, wall by wall.

The outcome

Real geometry replaced assumption. Right angles and wall thicknesses that would otherwise have been taken as given were instead measured — the kind of mismatch that, left unchecked, surfaces mid-construction instead of on a drawing.

A historic masonry building shown as a point cloud alongside a colored BIM floor overlay
A historic masonry building shown as a point cloud alongside a colored BIM floor overlay

Services used

Heritage Survey →Hungary →

Questions about this project

Why couldn't the original architectural drawings be used instead of a fresh survey?
Heritage buildings rarely have drawings that reflect their true current condition — settlement, prior repairs, and construction-era tolerances all diverge from what was originally drawn, which is exactly the mismatch a fresh scan is meant to catch.
Was the building's irregular geometry corrected or straightened in the drawing?
No — walls that are out of square or masonry that bows are preserved exactly as captured; smoothing them into idealized right angles would defeat the purpose of an as-built survey.
How was the point cloud used alongside the renovation design?
It was overlaid with a colored BIM floor plan so the renovation architects could directly compare the planned changes against the real, as-built geometry.
Is this level of care standard for every heritage project, or specific to this one?
Standard — every heritage survey we take on gets the same non-invasive capture and point-cloud-first drafting approach; see the Heritage Survey service page for the general workflow.
What accuracy was delivered on this project?
±2 mm as-built accuracy, the same standard we apply to modern-building surveys — heritage geometry doesn't get a lower accuracy bar just because it's irregular.

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