Quote or estimate?
A quote presents a proposed price for defined work, often with a validity period. An estimate projects a likely cost when some details are uncertain. State the scope, assumptions and how changes will be approved. Whether either document becomes binding depends on its terms, acceptance and applicable law.
The Quotation Generator adds a validity date, which is what stops an old price following you around. Quotation Generator
Why the validity date matters
A validity date tells the customer how long you intend to hold the proposed price. It also gives you a point to review it if costs or availability change. State any conditions that affect the price.
Choose a period that reflects the job and your supplier prices. There is no universal default: short-lived material prices may need a shorter validity period.
Going over an estimate
If the work changes, explain the new scope and price before proceeding and record the customer's approval. What you may charge depends on the agreement and applicable consumer or contract rules. Listing assumptions in the estimate makes the change easier to assess.
Questions people ask next
Is a quote legally binding?
It can be, depending on its wording, how it was accepted and the law that applies. Include a clear scope, conditions and validity date, and seek legal advice for a dispute.
How much can an estimate change?
There is no universal percentage. Agree the assumptions and a process for approving extra work before the cost changes.