Strictly, a full gut means the interior is taken back to the framing. Drywall and plaster come off, old wiring and plumbing come out, and the mechanical systems get replaced. Layouts often change, which means structural work like moving or headering a bearing wall. That's the definition the chapter here uses, and it's the one that matters when you're comparing budgets, because a job at that depth pulls permits, inspections and a longer schedule.
The loose market usage is what you've run into. Plenty of people say "gutted the place" when they mean new kitchen, new baths, new floors and paint. That's a cosmetic-plus job. Nothing wrong with it, and it can make good money, but it doesn't carry the same exposure. Nobody opens a wall on a paint-and-counters flip and finds knob-and-tube wiring that adds three weeks.
So yes, the distinction matters for exactly the reason you asked. Rehab costs commonly run 20 to 33 percent of the after-repair value, and a true gut sits at the top of that band or above it. If someone's write-up shows 12 percent of ARV in rehab and calls it a gut, their scope was lighter than yours would be.
One thing that trips up people coming from the trades: your cost estimate can be excellent and the deal can still lose money on carry. Interest, taxes, insurance and utilities run every month whether the crew shows up or not. Model 120 to 150 days of holding, not 90. The construction knowledge protects the budget line, and the schedule line is where the surprise usually lands.
