Updated 19 October 2026. An estimate is good for 14 to 30 days. Issued 19 October 2026, a roof estimate is good until 2 November and a design estimate is good until 18 November. Write that date on the PDF. Build it in the estimate generator, then turn the accepted number into an invoice.
No — validity is whatever you state on the document. Convention is 14-30 days but you can choose any period.
Without an expiry, the offer remains open indefinitely in legal terms — though courts generally interpret 'reasonable time' (often 30-60 days).
Yes — issue an updated estimate with a new validity date.
Yes — any revision to the estimate starts a new validity period from the issue date of the revised estimate.
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