Most disputes over a project didn't start as disagreements — they started as assumptions two sides never actually confirmed with each other. A few short lines of terms on the quotation itself close most of those gaps before they become a problem.
Validity period
State clearly how long the quoted price stands — 14 or 30 days is typical. Without this, a client accepting months later at the original price can create a real cost problem if your own costs have since changed.
Payment terms
Deposit required to start, balance due on completion, or a milestone schedule for larger projects — state it plainly so there's no ambiguity about when money is actually expected.
What's included, and what isn't
A short line clarifying that revisions beyond an agreed number, or work outside the stated scope, will be quoted separately prevents the classic "I thought this was included" conversation later.
Timeline expectations
Even an approximate delivery window, with a note that it depends on timely client feedback, sets realistic expectations and gives you cover if delays come from the client's side, not yours.
Cancellation terms
What happens if the client cancels partway through — is the deposit refundable, is partial work billed — is much easier to state upfront than to negotiate after work has already started.