Thats not enough information.
If its an estate house - as in part of an estate, a purchaser would expect a Cert. of Compliance on closing.
If its a once off house, Cert. should issue on completion. If there are unfulfilled conditions, then either a restricted Cet. could issue or you could argue that the property is not complete , is not in compliance and therefore no cert. should issue.
Plus - Certs need to be paid for and if the developer won't pay, why would an engineer go to the trouble of certifying?
mf