Almost every job that runs long enough eventually hits something the original quote didn't cover — rot behind the drywall, a line that doesn't match the plan, a client who wants to add something once they see the work in progress. Handling it well or badly has almost nothing to do with whether the extra work was reasonable, and everything to do with whether it was documented.
Why "I'll just mention it" doesn't work
A verbal heads-up in the moment feels like enough, especially when the client says "sure, go ahead." By invoice time, the client remembers agreeing to the work happening — not necessarily agreeing to a specific added price. That gap is where change-order disputes actually come from.
What a change order needs to include
- What's changing and why, in plain language
- The added cost, itemized the same way the original quote was
- A signature or written approval before the extra work starts, not after it's done
The upside most owners miss
A written change order isn't just protection against a dispute — it's also the easiest upsell in the business, because the client is already standing in the job, already engaged, at the exact moment they're most likely to say yes to doing it right instead of doing it later.