1. Quick comparison
| Point | Quote | Estimate |
|---|---|---|
| Purpose | Offer to perform defined work for a stated price | Give an informed approximation before every detail is known |
| Price certainty | Usually intended to be firm for the stated scope | Expected to change if assumptions or actual work differ |
| When useful | Scope can be inspected and described with confidence | Unknown conditions make a firm price difficult |
| What happens next | Customer accepts, declines or asks for a change | Scope is clarified before a quote or work arrangement is agreed |
2. What is a quote?
A quote sets out the work and price you are offering. Once accepted, it may form part of the agreement between you and the customer, so write it carefully and keep the accepted version.
A clear quote defines its assumptions and validity period rather than suggesting it covers any work the customer later requests.
3. What is an estimate?
An estimate is a reasoned indication of likely cost, often used before the full condition or scope can be established. Explain the basis of the figure and the uncertainties that could change it.
Calling a document an estimate does not automatically remove every responsibility. Use accurate wording and seek advice for unusual or high-value arrangements.
4. When each approach makes sense
- A quote can suit a defined installation, repair or maintenance scope after inspection.
- An estimate can be more appropriate where opening up or investigation may reveal additional work.
- If uncertainty can be resolved with a survey or diagnostic visit, do that before committing to a firm quote.
5. What if the job scope changes?
Pause and explain the change before carrying out material extra work where practicable. Record the revised scope, cost and timing so both sides can refer to the same decision.
Do not quietly treat an accepted quote as permission for unrelated additions, and do not assume an estimate lets you increase the price without explanation.
6. Why written scope matters
Written scope reduces disagreement about what the price covered. Include meaningful exclusions, customer-supplied items, access assumptions and any work that depends on another trade.
7. Quote, invoice and receipt are different
- A quote presents proposed work and price before acceptance.
- An invoice requests payment for supplied goods or services.
- A receipt acknowledges that payment has been received.
8. Practical trade examples
A visible, standard replacement may be suitable for a quote. Investigating a concealed fault may begin with a diagnostic charge or estimate because the eventual repair is not yet known.
These examples illustrate the decision, not a rule for every job.
9. Questions before sending a price
Practical checklist
- Have I inspected enough to understand the work?
- Which assumptions could materially change the cost?
- Is the scope clear to a customer who was not present during my calculation?
- Should uncertainty be resolved before I offer a firm quote?
- Have I explained how changes will be agreed?
- Will I retain the version the customer receives?