I thought it all depended on when the work was done? Think if the work was done a certain number of years ago you would be able to get an indemnity policy against building control rocking up and forcing you to tear it down, which unless it is dangerous they can only do within 12 months of the work being completed. http://hoa.org.uk/services/ask-an-expert-2/ask-an-expert-i-am-selling-questions/selling-without-building-regulations/
Obviously this all assumes that you are happy with the quality of the work...
@Sam_w started
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I thought it all depended on when the work was done? Think if the work was done a certain number of years ago you would be able to get an indemnity policy against building control rocking up and forcing you to tear it down, which unless it is dangerous they can only do within 12 months of the work being completed. http://hoa.org.uk/services/ask-an-expert-2/ask-an-expert-i-am-selling-questions/selling-without-building-regulations/
Obviously this all assumes that you are happy with the quality of the work...