Repipes, waterlines, sewer lines, big filtration installs, complex water heater installs, and drain line replacements inside the house. The formula doesn't change up here, what changes is how confident you are in what you feed it. This is about building that confidence, and about using the experienced techs well when you don't have it yet.
Everything else on a big job you can count. Hours you have to predict.
On a big job you can count the parts, you can count the fixtures, you can measure the linear feet, and you can look up the excavator days. All of that is arithmetic. The one input that decides whether the job makes money is how many hours it actually takes, and that's the one input you have to predict.
This is why level shortcuts stop working at this size. A Level number is a fast way to communicate a familiar job. A repipe is not a familiar job, every house is different. Run the formula, every time, and put real thought into the hours. Then use the difficulty factors honestly instead of leaving them at zero, because on complex work the access, the skill required, and the risk are often what separate a profitable job from a painful one.
Do your own homework first. The call should check your thinking, not replace it.
Pull up the Big Job Helper for the job type and actually work through the questions on site, not from the truck. Count every fixture, measure the runs, check the depth, look at the crawlspace, find the access route, and note the pipe material you're removing.
Those questions exist because each one maps to hours. A tight crawlspace, plaster instead of drywall, or a line that runs under a driveway can each swing a job by a day. If you answer them on site you're pricing what's actually there instead of what you assumed.
Separately list the things you genuinely cannot see: routing inside finished walls, what's under the slab, the condition of pipe you haven't exposed, whether a pull will take. Be specific about each unknown rather than feeling generally unsure.
Naming the unknowns turns vague anxiety into a short list you can actually get help with. It also tells you where the risk sits, which is exactly what you need to price a buffer and to set the customer's expectations honestly.
Before you call anyone, run the formula yourself and commit to a number, along with the reasoning: this many hours because of these conditions, this much in parts, these factor ratings, these excavator days.
You learn far more from being corrected on a real attempt than from being handed an answer. It also makes the call dramatically faster, because instead of describing a job from scratch you're asking someone to pressure-test a specific estimate.
They can only help with what they can see. Send these before the call, not during it.
Respect their time and you'll get far more out of them.
The conditions that most often make a big job take far longer than it looks.
When a job has a plan A that might not work, price both paths and present both up front.
Some big jobs have a fast path and a fallback. A waterline is the clearest example: if the pull works, it's one price. If the pull fails and you have to open up a trench instead, it's a different, higher price. We don't wait to find out before we talk about it.
Work out both numbers before you start, then walk the customer through both: here's what it costs if it goes as planned, and here's what it becomes if we hit this specific problem and have to switch to the backup plan. Get them comfortable with both before anyone puts a shovel in the ground.
These get left out of big quotes constantly. Each one is real money.
Common examples, not a complete list. Any job big enough to need real thought belongs here, and the same thinking applies.