New builds and warranties
The boiler card names a different plot number. Has the warranty or this survey confirmed the boiler that belongs to this plot?
No. The card names a different plot number, and neither that paper nor this survey has confirmed the boiler for this plot. The visit records the mismatch. It has not matched the appliance on the wall to a schedule for this address. NHBC describes Buildmark as a 10-year warranty and insurance product where that policy applies. The survey does not open a claim and has not decided which boiler any policy covers. Confirmation is missing.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
A commissioning card should identify the appliance and the address it serves. A wrong plot number means the card may belong next door, or this house may hold the wrong card. The survey cannot see the warranty file and cannot rewrite the card. The boiler on the wall may still be the one fitted here. The card does not say so. Confirmation would be a record that names this plot and this appliance together. That record was not established.
Give the card to the solicitor and ask the builder or the warranty administrator to confirm the boiler registered to this plot. Do not ask the survey to open a Buildmark claim. An engineer can read serial numbers if identity matters. The inspection has not reconciled them. Tell a lender the card names another plot, not that the boiler failed a firing test. No such test was done.
What should you ask your surveyor?
- What plot number is printed on the card?
- Is a serial number visible on the boiler itself?
- Who keeps the warranty record for this address?
What are the typical next steps?
- Send the mismatched card to the solicitor.
- Ask the warranty administrator which boiler is registered to this plot.
- Do not treat the survey as confirmation or as a claim.
Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.
Also asked about this
Does the wrong plot number mean the boiler will not fire?
No. The card is paperwork. A wrong plot number does not show the boiler failed to fire, and the survey has not tested it. The problem is identity: the card does not confirm this boiler belongs to this plot. Whether it runs is a separate question. Warranty confirmation is still missing, and the survey has not supplied it.
Has the survey opened a Buildmark claim about the card?
No. The survey does not open a claim. NHBC describes Buildmark as a 10-year warranty and insurance product where that is the policy offered. The visit recorded a card naming another plot. The builder or the warranty administrator, through your solicitor, sorts the register. The inspection has not lodged a claim.