Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
If your builder becomes insolvent then NHBC will repay the amount you have already paid to them under contract and which you cannot recover, up to a limit of 10% of the original purchase price or £100,000, whichever is less. Or if the property has been started, NHBC may instead pay the additional cost up to this limit to complete the home in accordance with NHBC requirements.
So, provided your Solicitor has confirmed to you that the property has the benefit of the NHBC cover, you have nothing to worry about.
I hope this assists and puts your mind at rest.