ChatGPT’s full reply to our quote prompt
Free ChatGPT, logged out, 16 October 2026. Copied word for word. The customer, business and VAT number are made up.
Check every number before you send a quote. AI can get sums and rules wrong.
The prompt we used
Turn my notes below into a clear quote for Mrs Patel, 14 Elm Rd, Leeds from Dave's Plumbing. List each item with a short description, quantity, unit price (ex VAT) and line total. Label the price column "Unit price (ex VAT)". Show subtotal, VAT at 20% (only if I'm VAT-registered: my VAT number is GB000000000, show it on the quote) and total. Payment terms 14 days. Quote valid for 30 days. British English, £ only. Flag anything I've missed (e.g. certificates, Building Regs notification, making good). Notes: Replace combi boiler, Mrs Patel, 14 Elm Rd. Boiler £1,150, flue kit £95, magnetic filter £120, 1.5 days labour at £320/day, disposal £40.
The reply
ChatGPT said: Here’s a clear, customer-ready quotation from Dave’s Plumbing, with the itemised costs, VAT and payment terms. I’ve also included a checklist of items to confirm before sending it. Writing DAVE'S PLUMBING QUOTATION Quote reference: DP-001 Date: 16 October 2026 Valid for: 30 days from the date of issue Prepared for: Mrs Patel Installation address: 14 Elm Rd, Leeds Description of work: Replacement of existing combi boiler, including associated flue kit, magnetic filter, labour and disposal of the old boiler. Itemised quotation Item Description Quantity Unit price (ex VAT) Line total (ex VAT) 1 Combi boiler supply 1 £1,150.00 £1,150.00 2 Boiler flue kit 1 £95.00 £95.00 3 Magnetic filter 1 £120.00 £120.00 4 Installation labour 1.5 days £320.00 per day £480.00 5 Removal and disposal of existing boiler 1 £40.00 £40.00 Subtotal (ex VAT) £1,885.00 VAT at 20% £377.00 Total (inc VAT) £2,262.00 VAT registration number: GB000000000 Payment terms Payment is due within 14 days of the invoice date. Quote validity This quotation is valid for 30 days from the date of issue. Any changes to the agreed scope of work may result in a revised quotation. Scope and assumptions This quotation covers the items and labour listed above. Any additional materials, remedial work or services not specified in this quotation will be discussed and agreed with the customer before being undertaken. Thank you for the opportunity to provide this quotation. Dave's Plumbing Items to check before sending VAT registration: Confirm that you are VAT-registered and that GB000000000 is your correct VAT number. The VAT calculation above assumes standard-rate VAT at 20%. Boiler specification: Add the boiler make, model, output rating and warranty details, if known. Gas safety and commissioning: Confirm that installation, testing, commissioning and the relevant handover documentation are included in the labour charge. Building Regulations: Confirm who will arrange the required notification and compliance documentation. For a gas boiler installation in England, this is normally handled through an appropriately registered installer and the applicable notification scheme. Gas Safe registration: Include your business details and Gas Safe registration information where applicable. Making good: Clarify whether any repairs to walls, ceilings, tiles, pipework finishes or decoration following installation are included or excluded. Additional costs: Confirm whether the quote includes any necessary system alterations, condensate pipework, flushing, electrical work or upgrades required to complete the installation. Old boiler disposal: Confirm that the disposal charge includes removal from the property and lawful disposal. Recommendation: The figures add up correctly. Before issuing the quote, verify the VAT number and clarify the boiler specification, commissioning and compliance arrangements, and making-good exclusions.