We had an extension built around 2 and a half years ago which required a beam across back of house. At start of extension the architect changed design slightly but didnt submit drawings straight away to building contol. Although they knew about change and made subsequent visits and also observed beam in place, they now wont grant completion certificate because they say they didnt see foundations for pier supporting beam. My argument is that if they did not see foundations in place(which I dont believe, i think he missed them) why let me continue with 1. putting beam in , 2 finishing house off before mentioning after 2 1/2 years about problem?