How To Never Miss Scope: 3 Patterns Every Estimator Should Check

Preconstruction expert Sampada Chavan joined the Togal20 to share how the best estimators use pattern recognition to sharpen their gut checks — here’s what you missed.

Once a month, we host the Togal20 Webinar, a 20-minute webinar that delivers expert insights on the construction industry and actionable takeaways for our attendees.

This March, our guest was Sampada Chavan, a VDC preconstruction engineer, estimating expert, and host of the Future Builds podcast. She joined Kelsey Formost (Head of Marketing at Togal.AI) to break down one of the most underrated skills in construction estimating: Pattern recognition.

The goal? Help estimators build a mental gut check they can apply to every takeoff. It’s all about validating quantities, catching scope omissions before they become costly, and ultimately submitting more competitive bids with greater confidence.

Here are the three pattern recognition checks every estimator should use, and how to put them to work immediately.

The Real Estimator Challenge

Estimators today are dealing with a lot:

• Hundreds, sometimes thousands, of document pages to process per bid
• Bid deadlines that force speed over thoroughness
• Drawings that contradict specs, leaving ambiguity that needs a judgment call
• Cognitive fatigue causes estimators to overlook details when the volume gets overwhelming

That last one is worth pausing on. Cognitive fatigue isn’t a personal failing. It’s a predictable result of staring at too many drawings for too long. And it’s one of the leading causes of scope omissions that erode margins.

With a tight deadline, slowing down isn’t an option. Instead, the solution is to work smarter—and that starts with a shift in mindset.

Zoom Out: The Mindset Shift That Changes Everything

Early in Sampada’s career, she was doing concrete estimating for a subcontractor. She was meticulous; categorizing every pour, tracking walls, slabs, footings, and piers down to the detail.

What she realized, though, was that she had no idea how many total cubic yards were going into the projects she was estimating. She knew the parts. But she didn’t know the whole story.

“Estimating is also about zooming out and looking at the patterns,” she says. “Pattern recognition is like a gut check. We already have the skill. It’s about how we sharpen it.”

Being detail-oriented is a core strength of every great estimator. But the best estimators carry a second skill alongside it: the ability to step back and ask whether the details add up to something that makes sense.

Pattern Check #1: Repetition of Systems

While every project is different, no building project is entirely unique. Architects and engineers work from templates. Structural logic repeats floor to floor. MEP layouts follow predictable patterns. And once you start estimating similar project types—multifamily, hospitality, healthcare—you start to see the ratios.

Think about it like this. Doors per unit. Windows per wall. Structural tonnage per cubic yard of concrete. These aren’t rules; they’re rules of thumb. And once you realize that, you can use it to your advantage.

Sampada uses the following example: If a multifamily project has 120 units and each unit typically contains 7 to 8 interior doors, you already know—before you’ve done a single takeoff —that the project should have more than 900 doors.

If your completed takeoff returns 620, that’s a red flag. Something got missed!

This is the power of pattern recognition as a validation tool. It’s a sanity check for your takeoffs so you never miss scope.

Where AI-assisted takeoffs accelerate this: When Togal.AI handles the mechanical work of clicking, tracing, and counting, your mental bandwidth is freed up to apply these ratio checks in real time—rather than after you’ve already burned hours on a takeoff that needs to be redone.

Better yet, Togal.AI offers a Repeating Groups feature, which allows estimators to duplicate plans for similar rooms or features—saving time.

Pattern Check #2: The Scope Isolation Trap

This one is sneaky. And it catches experienced estimators just as often as new ones!

When you’re working in your discipline, it’s easy to stay in your discipline. An estimator focused on architectural drawings may complete a thorough, accurate takeoff of everything on those sheets.

The problem? Architectural drawings don’t own all the scope in a room. Mechanical, electrical, and plumbing work live in a parallel set of drawings. And where MEP is dense—so is scope.

Sampada calls it the Scope Isolation Trap: Getting so focused on one set of drawings that you miss what’s happening in the same physical space on another set.

Her rule is simple: If it’s a high-density, multi-system area, there is always going to be a high-density of scope. Areas with more drawings dedicated to them have more scope. Treat them like a red alert.

Overlooking how MEP systems interact with your architectural drawings doesn’t just create omissions—it creates scope creep down the line, when the clash between what was assumed and what’s actually required surfaces mid-project.

Consider other trades and disciplines that might similarly affect your quantities.

Pattern Check #3: Rules of Exception

The most dangerous words in a set of drawings aren’t the ones that tell you what’s included. They’re the ones that tell you what isn’t.

Train yourself to find phrases like these:

• “Unless otherwise noted,”
• “See details”
• “Typical, except at…”

These qualifiers appear in drawing notes and specifications constantly. And because they’re small, they often get skipped. But according to Sampada, missing a note like “unless otherwise noted” isn’t just a minor oversight—it’s often where scope changes hide.

“You don’t miss scope. You miss notes like these,” she says. “They’re hidden in the details.”

Part of the challenge is that architects often write specifications from templates used on previous projects. Overlap is common. Exceptions get buried. Which means the default assumption—that the spec is the basis of design, full stop—can be wrong. The drawings may show exceptions that change everything.

Togal.AI makes this even easier. Our AI text search lets estimators pull up every instance of a specific phrase across an entire plan set. Type in “unless otherwise noted” and get hyperlinked results across every sheet. It’s one of the fastest ways to run a Rules of Exception check before you submit.

Putting It All Together: Intuitive Estimating

These three checks aren’t a replacement for detailed estimating. They’re a validation layer on top of it.

Run them in sequence:

1. Repetition of Systems: Do your quantities match the ratios you’d expect for this project type?
2. Scope Isolation Trap: Have you accounted for MEP scope in high-density areas, not just what’s on your discipline’s sheets?
3. Rules of Exception: Have you reviewed the drawing notes and specs for qualifying language that changes the scope?

If you can answer yes to all three with confidence, your estimate is on solid ground. If any of them surfaces a discrepancy, you’ve just caught a costly mistake before it hits the bid.

That’s the gut check. And now it’s yours.

Join Us for Future Togal20 Webinars

The Togal20 happens every third Thursday of the month, and offers actionable takeaways you can actually use. Registered attendees receive a follow-up PDF with all the key tips from the session.

Interested in speeding up your takeoffs, while retaining accuracy? Book a custom demo of Togal.AI with our estimating experts today!