A large share of change orders on renovation and tenant improvement projects have nothing to do with scope changes the owner asked for. They come from existing conditions that didn’t match the drawings the bid was built on.
A corridor that’s narrower than plan, a column three inches off its drawn location, a ceiling that’s a foot lower than the record set shows. None of that is unusual. What’s unusual is finding it out after demolition starts.
Reality capture doesn’t eliminate change orders. It eliminates the category that comes from not knowing what’s actually there before pricing and design are locked in.
Where Existing-Conditions Change Orders Come From
Most record drawings for older buildings were never updated after the last renovation, or they were built from a field walk with a tape measure and a laser distance meter. That process captures dozens of dimensions on a good day. A single floor of a commercial building has thousands of surfaces that matter to a design team: wall locations, ceiling heights, column offsets, door swings, soffit drops.
When a design is developed from incomplete or outdated existing-conditions data, the gaps don’t show up until a contractor opens a wall or sets a layout line on site. At that point the fix isn’t a drawing revision, it’s a change order, and it usually comes with a schedule hit attached.
What a Scan Captures Before Pricing Starts
A laser scan records every visible surface in a space as a point cloud, typically accurate to a few millimeters. Walls, floors, ceilings, columns, doors, windows, fixtures, and exposed structure all get captured at the same time, in one pass, instead of one dimension at a time with a tape measure.
From that point cloud we build a scan-to-BIM model, usually at LOD 300 for renovation work, which gives the design team specific dimensions and locations for every modeled element. That model becomes the basis for design and pricing instead of a set of drawings that may or may not reflect the building as it actually stands. This applies to visible, accessible conditions; a scan doesn’t see above a finished ceiling or inside a closed wall, so conditions hidden behind finished surfaces are a separate risk that existing-conditions scanning doesn’t remove.
Timing Matters More Than the Scan Itself
The value of a scan depends entirely on when it happens. Scanning a space after construction documents are issued for permit is still useful for reference, but it’s too late to change the drawings the GC is pricing from. The change order risk that scanning is meant to prevent gets locked in the moment the design team finalizes the drawings without accurate existing-conditions data behind them.
Scanning during pre-design or pre-construction, before the design team commits to dimensions, is what actually prevents those change orders. It gives architects and engineers real geometry to design against instead of assumed geometry, and it gives the GC a bid package built on conditions that match the field.
What This Looks Like on a Real Project
On a typical renovation, an accurate scan will usually turn up something the original drawings missed: a slab that’s out of level by an inch or two across a room, a corridor that’s six inches narrower than shown, a column grid that shifted at some point during a prior build-out. Catching that during design means the architect adjusts the drawings once, before pricing. Catching it after demo means an RFI, a delay while the design team resolves it, and a change order to cover the rework.
The difference isn’t whether the discrepancy exists. It almost always does on a building that’s been renovated before. The difference is whether it gets resolved on paper before construction starts or in the field after it does.
What Reality Capture Doesn’t Cover
Scanning reduces the change orders tied to inaccurate or missing existing-conditions data. It doesn’t reduce change orders driven by owner scope changes, material substitutions, or conditions concealed behind finished ceilings and walls until those surfaces are opened. Those categories need their own contingency planning regardless of how good the existing-conditions model is. What a scan does is remove the guesswork from everything that’s visible and accessible at the time of capture, which for most renovation projects is the majority of the existing-conditions risk.
Frequently Asked Questions
How far ahead of construction should the scan happen?
Before the design team finalizes drawings for permit or pricing. Scanning during pre-design or early schematic design gives architects and engineers real dimensions to work from instead of field-verifying individual details later. Scanning after documents are issued still has value for reference, but it won’t change what the GC is already pricing.
Does scanning eliminate change orders entirely?
No. It reduces the specific category tied to inaccurate or missing existing-conditions data. Change orders driven by owner-requested scope changes or conditions hidden behind finished surfaces still require their own contingency planning.
What do we get from the scan for bidding purposes?
A point cloud and, for most renovation work, a scan-to-BIM model at LOD 300. Both are delivered in formats compatible with AutoCAD, Revit, and Navisworks, so the design team and GC can work from the same accurate existing-conditions data during pricing.
Can a scan catch conditions above the ceiling or inside walls?
No. Scanning captures visible, accessible surfaces. Conditions behind finished ceilings or inside closed walls aren’t part of the scan and should still be accounted for separately in project contingency.