The legal difference between a quote and an estimate in the UK, and which one actually protects your business.
A quote is a fixed commitment
Once accepted, a quote is generally legally binding at the price stated — you’re committing to deliver at that figure, even if your actual costs turn out higher than expected.
An estimate is exactly that — an estimate
Not legally binding in the same way, and understood by both sides as an approximation that may change once the full scope of work is clear.
Which to use, and when
Use a quote when you’re confident in the full scope and cost. Use an estimate when genuine uncertainty exists — for example, before a site survey reveals the real extent of work needed. Being clear about which one you’re issuing, and labelling it correctly, protects you from disputes later.
Create a professional quote with the Payslp Quote Generator.
What to do if costs genuinely change after a quote is accepted
If you’ve issued a fixed quote and genuinely unforeseen costs arise, communicate clearly and promptly with the client rather than silently absorbing the cost or unilaterally changing the price — most reasonable clients respond well to early, honest communication about a genuine change in scope.
Frequently asked questions
Can I convert an estimate into a binding quote later?
Yes, commonly once the full scope becomes clear — just be explicit with the client that you’re now issuing a fixed quote, replacing the earlier estimate.