Estimates are promises. Stop making ones you won’t keep.
Optimistic estimates feel polite. They’re the cheapest way to lose a client’s trust.
Every project starts with an estimate. Almost every estimate is wrong. This is not a scandal — projects are complex, and early estimates are guesses with confidence. But there’s a specific kind of wrong estimate that does real damage: the optimistic one given to make a client feel good.
Why optimistic estimates feel kind
The client wants it done fast. The team wants to win the work. Saying ‘three weeks’ feels helpful in the room. Saying ‘six to eight weeks, probably seven’ feels like you’re being difficult. So ‘three weeks’ it is.
Then week four arrives, the work isn’t done, and a difficult conversation begins. The client doesn’t just feel inconvenienced — they feel misled. The trust that took two months to build takes one missed deadline to dent.
“Underpromising and overdelivering isn’t a tactic. It’s the only honest version of the job.”
Where estimates go wrong
Underestimating boring work. Reviews, revisions, QA, stakeholder feedback, content gathering. These always take longer than expected because they involve other people. If your estimate assumes every response is same-day, it’s wrong.
Ignoring the last 10%. The last 10% of a project is 30% of the time. Every estimate that doesn’t account for finish time is pre-lying.
Confusing ‘how long I’ll work on it’ with ‘how long until it’s done.’ You might work 40 hours on something, but those 40 hours might be spread over three weeks of waiting for reviews, approvals, copy. Tell the client the calendar, not the time.
The honest version
Give a range, not a number. ‘Six to eight weeks.’ The range forces you to think about what would push you to eight, and naming those risks out loud lets the client weigh them. If the client wants certainty, charge for it — deliver faster only by descoping, not by promising.
Say what you’ll do when things slip. Things always slip somewhere. The difference between a good agency and a bad one isn’t that one slips and the other doesn’t — it’s that one tells you about the slip on day one, and the other tells you at the deadline.
Why this compounds
Clients who’ve been burned by optimistic agencies notice immediately when you’re honest about timelines. They’ll actually trust your estimate more when it’s longer, because you sound like you’ve done this before. Over years, this builds a reputation that wins work without having to compete on speed.
Your estimate is a promise. Every kept one earns trust. Every broken one costs it. The math isn’t complicated — most agencies are just too optimistic to run it.