As-Built & Documentation

As-Built Drawings: What They Are, What's Included, and Why You Need Them

Erik Juárez, Director — DynamicJT

As-built drawings document what actually exists in your facility — not what the design said. What's included, delivery formats, accuracy (±2 mm), turnaround and cost ($0.25–$0.50/sq ft) from 3D laser scanning.

Key takeaways
As-built drawings document a facility's real, current condition — what was actually built, including every undocumented change — not the original design intent.
They're produced from a 3D laser scan: a millimeter-accurate point cloud (±2 mm) becomes 2D CAD drawings, a Revit/CAD model, or both.
Why it matters: on brownfield work, the gap between old drawings and field reality (inches to several feet) is where change orders, clashes and rework hide.
Deliverables: 2D CAD (.dwg), 3D as-built model (Revit/IFC/Plant 3D), and the registered point cloud (.rcp/.e57/.las) with a 360° virtual tour.
Cost & speed: typically $0.25–$0.50 per square foot (USD), $5,000 minimum; field capture is usually one mobilization, with models in days, not weeks.

Picture a plant with miles of pipe running through it, and no one who can tell you with certainty where each line goes. Nobody knows which lines are live and which have been dead for years. The day a modification is needed, no one can say what you're about to cut into — or what happens when you do.

That isn't a hypothetical. When our team documented the facility at Creek Ranch in Boyd, Texas, the client described the piping in a single word — spaghetti: no one could say with certainty which lines were live, which were dead, or where each one started and ended. It's the condition of most brownfield industrial facilities: decades of changes, tie-ins and add-ons that were never recorded anywhere.

As-built drawings are the fix for that problem. If you operate or engineer an existing facility without reliable documentation, this is for you.

What as-built drawings are

An as-built drawing documents the current, real condition of a facility — what was actually built, including every change made since construction — not the original design or what should be there in theory.

It captures what's actually in place: where the columns are, how the pipe runs, where each piece of equipment sits, and every modification made over the years.

The difference from a design drawing is the whole point. A design drawing shows what was planned. An as-built shows what was built — including every change, adjustment and expansion that, in most facilities, never made it back into any document.

In practice, we produce as-built drawings from a 3D laser scan. The resulting point cloud works like a three-dimensional tracing of reality: every element is captured at millimeter-level accuracy (typically ±2 mm with terrestrial scanners), and every deliverable is generated from that single source of truth.

As-built vs. record vs. red-line drawings

Red-line drawings: marked-up design drawings noting changes made in the field during construction. Handwritten, often incomplete.
Record drawings: a cleaned-up set incorporating those red-lines — only as accurate as the red-lines were.
As-built (scan-based): an independently measured record of true conditions, captured by laser scan. It doesn't depend on anyone having documented the changes — it measures what's physically there today.

On a facility that's been modified for years, a scan-based as-built is verified, not transcribed.

Why the drawings you already have probably aren't reliable

In most industrial plants, drawings exist — they just don't match the field. Every new line, every relocated skid, every section of pipe that got added or capped changed the facility without anyone updating the documentation.

In our field work, the differences between drawings and reality range from a few inches to several feet, depending on how long the plant has operated. On any reconfiguration, tie-in or turnaround, that gap is where the cost overruns live. A verified as-built closes that gap before engineering starts, not during construction.

What you actually receive: the deliverables

Deliverable	Format	Best for	Relative cost
Registered point cloud	.rcp, .e57, .las + 360° panoramas	In-house modeling, verified reference, virtual walkthrough	Base
2D as-built drawings	AutoCAD .dwg, PDF	Documentation, permitting, modification design	Low
3D as-built model	Revit, IFC, Plant 3D, Navisworks	Coordination, clash detection, lifecycle management	Higher up front, lowest over time

3D As-Built Model (Scan-to-BIM / Scan-to-CAD). The complete 3D representation in the disciplines you need — piping, equipment, structural, architectural. Once it exists, you can pull plans, sections and elevations in seconds. For the Revit-vs-AutoCAD decision and what LOD means, see Scan-to-BIM vs Scan-to-CAD.

2D As-Built Drawings (CAD). Plan, section and elevation drawings generated directly from the point cloud. Lower up-front cost, but a later view has to be re-quoted.

Registered point cloud. Delivered alongside either, in .rcp for the Autodesk suite or .e57/.las with a free viewer — a 360° virtual tour of the facility at no extra cost.

How long as-built drawings take

3D As-Built model — 1:5. Per day of field scanning, modeling takes ~5 days.
2D drawings — 1:2. Per day of field scanning, drafting takes ~2 days.

For reference, a terrestrial crew captures 15,000–30,000 sq ft/day; mobile (SLAM) capture covers far more where tolerances allow. We confirm the schedule before we start.

Beyond reconfiguration: uses you may not have considered

Turnarounds and shutdowns. Plan tie-ins before the unit comes down, compressing on-site time.
MEP and structural coordination. New work fits existing conditions on the first try.
Manufacturing line changes. Automotive and process plants reconfigure lines each model year.
Heavy industry and mining. Process areas are modified continuously — every project starts from documented reality.
Asset valuation, sale or divestiture. For Warrior Met Coal in Brookwood, Alabama — a metallurgical coal operation divesting assets — an accurate 3D record lets you quantify what's in place and plan an orderly decommissioning.
Maintenance and handoff. Plan preventive maintenance against real conditions.

Frequently asked questions

What are as-built drawings?
As-built drawings document the real, current condition of a facility — what was actually built, including every modification since original construction. From a 3D laser scan, they're an independently measured record (±2 mm), not a transcription of red-lines.

What's the difference between as-built and design drawings?
Design drawings show what was planned. As-built drawings document what was actually built. In older facilities the difference can range from a few inches to several feet.

What's the difference between as-built and record drawings?
Record drawings incorporate field red-lines into the design set — accurate only if the red-lines were. A scan-based as-built measures true conditions directly.

Can I request only part of the facility?
Yes. We model by area, floor, or discipline, so you control cost. The captured point cloud is reused without re-scanning if you expand scope.

What format is the point cloud delivered in?
.rcp for the Autodesk suite, or .e57/.las with a free viewer and a 360° virtual tour at no additional cost.

How accurate are scan-based as-builts?
Survey-grade, typically ±2 mm — far more precise than tape or red-lines for complex environments.

How much does an as-built survey cost?
$0.25–$0.50 per square foot (USD), $5,000 minimum, depending on size, complexity and deliverable. See our pricing FAQ.

Document it before you touch it

If you have a facility you need to document, we'll walk you through the scope that makes sense. A 20-minute conversation is usually enough. We're based in Houston and mobilize across Texas, Louisiana, Oklahoma and the Gulf Coast, with survey-grade accuracy and ISNetworld® compliance. Request a quote or call +1 (832) 746-1497.