It's 7 p.m. on a Thursday. The asset was already approved. Then an email comes in from the client, cc'ing someone new nobody at the agency has met, asking for "a few quick tweaks." The designer opens the file for the third time this week. The copywriter rewrites a headline they already rewrote. The account lead builds a new timeline that pushes delivery to Monday.
Nobody in that scene is doing anything wrong. Everyone is working, and working hard. The problem is they're working on something that was already done.
That's rework. And at most agencies, it isn't the exception. It's part of the landscape, so routine that nobody notices it anymore.
Rework never shows up on an invoice
There are hours you sell and hours you give away. The first kind lives in a proposal, a retainer, a SOW. The second kind dissolves into the day to day: the fourth round of revisions, the deck rebuilt because the client's point of contact changed, the video recut because the original brief didn't say what the client actually wanted.
Those hours have a precise cost. Someone worked them, someone got paid for them, someone didn't do something else in the meantime. What they don't have is a place in the agency's numbers. They're not on the invoice, not in the monthly report, and almost never part of the conversation with the client.
That's what makes rework so dangerous. It doesn't feel like a loss. It feels like "that's just the job."
What the numbers say
In the COR Report 2026, we asked agencies what percentage of their team's time goes to rework. The answers paint a picture many leaders sense but few have actually sized up.
Nearly half, 49.4%, put their rework somewhere between 15% and 40% of team time. Another 8.7% go further and admit they're at 40% or more.
It helps to make that concrete. A 20-person agency works roughly 3,200 hours a month. If rework takes up 15%, that's 480 hours: three full-time people doing nothing but redoing things. At 25%, it's five people. At 40%, it's eight. Eight salaries, eight seats, paid for by the agency to redo work that was already finished.
No agency would ever hire eight people for that on purpose. But plenty are paying for them anyway.
One in four agencies doesn't know how much they redo
The most unsettling finding in the report isn't how much rework there is. It's how much of it goes unseen.
27% of agencies don't measure rework at all. 14.6% simply answer "I don't know," and 12.7% say "I don't keep track." In other words, more than one in four agencies can't tell whether they're losing 5% or 45% of their team's time to revisiting finished work.
And what doesn't get measured tends to grow unchecked. If nobody knows how many revision rounds a project went through, nobody can say when it crossed the line. If nobody tracks which rework came from a thin brief and which came from an internal miss, nobody can fix either one. Invisible rework doesn't get discussed, billed, or prevented. It just gets absorbed.
Where it comes from
Look closely and rework almost never comes from a lack of talent. It comes from how work gets in, moves around, and gets approved. A few sources show up at nearly every agency:
Briefs that say too little. A two-line brief doesn't save time, it just delays the cost. Whatever wasn't defined up front gets defined later, on top of work that's already been produced.
Approvals with no owner. When five people on the client side weigh in and none of them has the final say, every round of feedback opens another one. The work doesn't move forward, it spins.
Scope creep that nobody flags. "While you're at it, can we get a version for Stories?" Each small ask seems harmless. Add them up and the project has changed without anyone changing the budget.
A new point of contact. A new marketing director shows up with their own vision, and the approved campaign is back on the table. The earlier work doesn't get used, but it doesn't get acknowledged either.
Internal handoff gaps. Information that stayed on a call, a comment that never reached the creative team, the wrong version of the file. This rework is the agency's own, which is exactly why it's harder to name.
What it does to your team
The cost of rework isn't only financial. Something wears down every time someone reopens a file they thought was closed.
Creative people come into this industry to make new things. When a big chunk of the week goes to undoing and redoing, the work starts to feel like a treadmill. Late nights become normal, deadlines slip, and the energy that should go into the next big idea gets spent on version seven of something that was fine at version two.
There's also something harder to see: rework crowds out the work that matters. Every hour spent redoing is an hour not spent thinking harder for that client, building a new offering, or developing someone on the team. When good people leave an agency, they rarely say "I left because of rework." But it's often part of the story.
What it does to your margin and your negotiating power
From a business standpoint, rework is margin quietly evaporating. A project scoped at a healthy profit can end up breaking even, or underwater, without anyone making a bad call. All it took was a few extra rounds.
And that's where the bigger problem shows up. When renewal comes around and the client asks to cut the retainer, the agency needs a case. But if it doesn't know how many out-of-scope revision rounds there were, how many hours went into redoing approved deliverables, or what that client actually cost to serve, it has nothing to hold its price with. Whatever you can't show, you end up giving away.
So rework hits you twice. Once when it's done. Again when you can't bill for it or defend it.
Where to start
No agency has zero rework, and chasing that wouldn't be healthy anyway. Iteration is part of the creative process. The question isn't how to eliminate it, but how to stop paying for it blind.
The first step is the least glamorous one: measure it. Know how many hours go to rework, for which clients, on which types of projects. Once that number is on the table, the conversations change.
The second is to separate the sources. Rework caused by a thin brief isn't the same as rework caused by an internal mistake. The first one is a conversation with the client; the second one gets fixed in-house.
The third is to write it into your agreements. How many revision rounds each deliverable includes, what happens after that, who signs off on the client side. Not to make the relationship rigid, but so every extra hour is a visible decision instead of a habit.
That's what COR does: it brings hours, costs, and projects into one place, so you can see how much time goes to rework, which clients it happens with, and how much margin it takes, while the project is still in motion. More than 1,000 agencies use COR to stop absorbing hours nobody sees and walk into every negotiation with their own data.
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