TL;DR: As-built scanning in construction uses a 3D laser scanner to capture exact, measurable conditions of a building during or after the work. The point cloud it produces becomes the source of truth for as-built drawings, BIM models, and clash checks. This guide walks Canadian project teams through when to scan, what to ask for, what it costs, and how it fits CSA, CCDC, and OpenBIM workflows. By the end, you'll know enough to write a scope and request a quote.
If you've ever opened a set of "as-builts" only to find they were really just redlined issue-for-construction drawings, you already know the problem. As-built scanning in construction fixes that. It replaces tape-and-camera measurement with a 3D record that holds every dimension you didn't know you'd need.
Canadian project teams are leaning into reality capture for good reason. Schedules are tighter. Owners are asking for digital handover. Renovation work is outpacing new builds in most provinces. The teams that figure out scanning early get cleaner closeouts, fewer change orders, and faster permit reviews.
This guide is for Canadian PMs, contractors, and designers who need a clear picture of how scanning fits a real construction site. We cover what it is, when to scan, what it costs, and what to put in your scope. Wherever it makes sense, we point to the Canadian standards that govern this work.
What Is As-Built Scanning in Construction?
As-built scanning in construction uses a 3D laser scanner to capture a building exactly as it sits. The scanner runs from multiple positions across the site. Crews stitch those scans into a single point cloud. That cloud becomes the source of truth for as-built drawings, BIM models, and verification reports.
The scanner sweeps up to two million points per second. Each point holds an XYZ coordinate accurate to a few millimetres. Once the scans are registered, you get a navigable 3D record of the structure. Walls, ducts, conduit, slab edges, columns, all captured in one pass.
You'll also hear this called point cloud scanning, terrestrial laser scanning (TLS), or reality capture. They all describe the same workflow.
The output usually goes to one of four places:
- 2D as-built drawings for renovation design
- BIM models, typically Revit, for coordination and handover
- Verification reports comparing built work to the issued model
- Heritage documentation for restoration scope
In Canada, the underlying measurement aligns with CSA Group surveying guidance and is delivered in the project's coordinate system, often tied to NAD83(CSRS) where survey-grade control matters.
If your project does not yet use scanning, take a look at our 3D laser scanning services to see typical deliverables and turnaround times.
Why Tape-and-Camera As-Builts Fail on Canadian Sites
Traditional as-built work in Canada usually means a person walking the site with a tape, a phone camera, and a marked-up drawing set. It works on simple jobs. It falls apart on anything complex.
Four failure modes show up over and over.
Sparse coverage. You measure what looks important. Six months later, the architect needs the dimension you skipped. Re-mobilizing across the country (Sudbury, Saguenay, Whitehorse) is expensive and slow.
Trade drift. The mechanical contractor and the framer measure differently. Their redlines do not reconcile. Nobody is wrong; everyone used a different reference.
Missing 3D context. A tape says a duct sits 360 mm off the wall. It does not tell you that duct will clash with a beam two metres ahead.
Cold weather. Tape and ladder work slows below minus 15 degrees Celsius. Scanning does not. Most current scanners operate down to minus 20 degrees Celsius (see the Leica RTC360 spec sheet for typical operating ranges), and our crews use winterization protocols below that.
A single half-day scan replaces all of it. The point cloud holds every dimension, every clash, every condition. You measure once and use forever.
In our workflow, the largest single ROI driver on retrofit projects is clash avoidance after rough-in. One avoided MEP rework typically pays for the entire scan pass. For projects with significant MEP scope, see how MEP scanning fits coordination workflows. The math usually works on the first run.
When Should You Scan During the Project?
The best time to scan depends on what the deliverable supports. Scan before demolition for renovation and adaptive reuse. Scan after rough-in but before drywall for new construction. Scan at substantial completion for record drawings and CCDC closeout. Scan mid-project when a clash, deviation, or dispute appears.
Each of those windows has a clear reason behind it.
Pre-demolition scanning. Captures existing conditions before crews touch a thing. This is the highest ROI scan window for renovation work. Designers walk into the project with reality, not 1987 drawings.
Post-rough-in scanning. The gold standard for new builds. Structure is up, MEP is roughed, and nothing is hidden behind drywall yet. The owner gets a permanent record of what's behind the walls. Future maintenance teams will thank you.
Substantial completion scanning. Produces final record drawings that meet CCDC closeout requirements. It's also the cleanest input for facility management software.
Mid-project verification. Triggers when something goes wrong. A deviation. A clash. A dispute. These scans are fast, focused, and surprisingly defensible if a project ends up in arbitration.
What Does an As-Built Scan Actually Cost?
A typical as-built scan in Canada runs as a field day rate plus office processing. Field rates cover up to roughly 3,500 square metres of straightforward indoor capture per day. Most renovation jobs land between $3,000 and $15,000 total, scaled by complexity and area. Add a few weeks of timeline if you need a Scan-to-BIM model on top.
Three things drive the price.
Site complexity. A bare warehouse scans fast. A multi-storey heritage building with detailed mouldings does not. Density of obstructions, ceiling height, and access constraints all add scan setups.
Deliverable depth. A raw, registered point cloud is the cheapest output. A full LOD 350 BIM model is much more involved and takes weeks. Match deliverable depth to the actual decision the drawings need to support.
Travel. Sites in Toronto, Montreal, and Vancouver cost less to mobilize than sites in northern BC, the territories, or coastal Newfoundland. Plan accordingly if you're working remote.
In our workflow, mobile scanning (handheld SLAM units) trades raw accuracy for speed. We use it for very large industrial floors where ±15 mm is acceptable and the ROI lives in coverage rate. For tighter tolerances we stick with terrestrial scanners.
For a precise number, share a floor plan with us. Email us a quote request.
The On-Site Workflow, Step by Step
Here's what a scanning day on an active Canadian site looks like, start to finish.
1. Scan plan. Before mobilizing, the lead marks scanner positions on the drawing set. The goal is full coverage with overlap between setups. On a 900 square metre floor with normal obstructions, expect 30 to 60 setups.
2. Setup and capture. Each setup runs 2 to 5 minutes. The operator walks the scanner from position to position. On union sites in Ontario and Quebec, we plan around trade jurisdictions. On industrial sites, we coordinate with the safety lead.
3. Targets and control. Survey-grade work ties into project control with checkerboard or sphere targets. Control is usually set by a licensed surveyor: AOLS in Ontario, OAGQ in Quebec, or ABCLS in BC. For typical AEC tolerance of plus or minus 3 to 6 millimetres, cloud-to-cloud registration is enough and faster.
4. Field QA. Before the lead leaves site, they check coverage on a tablet. Any gaps mean adding setups before demobilizing. Re-mobilization is the most expensive thing on a Canadian project, so we'd rather stay an extra hour.
5. Office processing. Registration, cleaning, and coordinate alignment happen back at the office. Typical turnaround is 3 to 7 business days for a clean, registered point cloud. BIM modelling takes longer.
In our workflow, registration is where projects either earn or lose their accuracy budget. Sphere targets tied to surveyed control hit the tighter end. Rushed cloud-to-cloud registration in featureless spaces (long corridors, blank warehouses) sit at the looser end. We always include a registration report so the client can see point-to-point error across all setups.
The whole day is non-disruptive. Scans are non-contact and lasers are eye-safe (Class 1 on most current TLS units, per the CAN/CSA-Z136.1 laser safety standard).
How Accurate Is As-Built Scanning in Construction?
Survey-grade scanners deliver plus or minus 2 to 4 millimetres at typical AEC working distances. After registration, full-building point clouds hold plus or minus 3 to 6 millimetres. That's tighter than CSA A23.1 concrete tolerances and far more accurate than any tape-and-camera workflow.
A few caveats matter.
Accuracy depends on the scanner, the operator, and the registration method. A good operator with a sphere-target workflow tied to surveyed control will hit the tighter end. A rushed cloud-to-cloud registration in a featureless space will sit at the looser end.
The other piece is documentation. Make sure your provider gives you a registration report. It should show point-to-point error across all setups. If they cannot produce one, that's a signal.
Mobile scanners sit in a different bracket. Handheld SLAM units typically deliver plus or minus 10 to 20 millimetres. They cover ground faster but should not be used where structural or coordination tolerances are tight.
Drawings, BIM, or Both? Picking Your Deliverable
Pick the deliverable that matches the decision the documents support, not the one that sounds most impressive in a meeting.
| Use case | Best deliverable | Accuracy | Format |
|---|---|---|---|
| Renovation design | As-built drawings 1:50 / 1:100 | ±6 mm | DWG + PDF |
| Coordination, clash | Scan-to-BIM LOD 300 / 350 (MEP) | ±3 mm | RVT + IFC |
| Facility handover | Federated Revit + colorized cloud | ±3 mm | RVT + E57/RCP |
| Dispute, change order | Annotated point-cloud sections | ±3 mm | |
| Heritage / restoration | Cloud + ortho elevations + BIM | ±2 mm | RVT + TIFF + E57 |
LOD here refers to the BIMForum Level of Development specification. LOD 300 covers structural and architectural geometry. LOD 350 adds connection and interface detail, which is where MEP coordination lives.
If your project is publicly funded, you may need IFC alongside Revit. buildingSMART Canada has been pushing OpenBIM workflows on public-sector work. Several provincial owner groups now require IFC outputs.
To explore which deliverable fits your project, check our services overview.
Wrapping Up
Three takeaways before you go.
One. As-built scanning replaces tape-and-camera measurement with a measurable 3D record. It's faster, more accurate, and works in Canadian winter conditions where tape work slows down.
Two. Match the deliverable to the decision. Drawings for design. BIM for coordination. Annotated cloud sections for disputes. Over-spec'd deliverables waste budget that should go elsewhere.
Three. The right scan window matters more than most teams realize. Pre-demolition for renovations. Post-rough-in for new builds. Substantial completion for handover. Mid-project for trouble.
If you have a Canadian project upcoming, share a floor plan with us. We'll send back a scan plan, deliverables list, and price within 24 hours. Email us a quote request or browse more field notes. The earlier you spec scanning into your project, the more you'll save.
Frequently Asked Questions
What are as-built drawings?
As-built drawings document a structure as it was actually built, including any deviations from the original design. Changes during construction, field decisions, and substitutions all show up. In Canada they're typically issued at substantial completion as part of the CCDC closeout package.
What's the difference between record drawings and as-builts?
Record drawings are the design team's curated version, issued at closeout. As-builts are the contractor's annotated working set captured during construction. Scanning produces something more accurate than either: a measurable 3D record with millimetre-level precision.
How accurate is as-built scanning compared to tape measurement?
Survey-grade scanners deliver plus or minus 2 to 4 millimetres at typical working distances (per the Leica RTC360 spec sheet). Registered full-building clouds hold plus or minus 3 to 6 millimetres. Tape measurement on a busy site rarely holds that tightly once you factor in human error, hard-to-reach dimensions, and the dimensions you didn't think to take.
Can scanning happen while construction is active?
Yes. Scans are non-contact, eye-safe (Class 1 lasers per CAN/CSA-Z136.1), and don't require shutdowns. Crews keep working around the scanner. We coordinate with the superintendent on lift paths and hot zones, and we wear CSA-compliant PPE on every site.
Does as-built scanning work in winter?
Yes, with caveats. Most modern scanners operate down to minus 20 degrees Celsius. Our crews use winterization protocols (battery management, condensation control, target stability on frozen ground) for colder work. We have successfully captured projects below minus 25 degrees Celsius across Quebec, Manitoba, and the Prairies.