I'm sorry to hear your having such an issue. I work with a few builders and it is a common misconception by them that an AAV is the same as an open vent.
The drainage should definitely be installed as per the original plans which should of been inspected very early on by the Building Control representative. However I would say at the moment, with the current climate, not as many site inspections are being completed. They are also not very thorough. I am currently renovating and extending a property and the building inspection regime is me sending them photos to highlight whatever they want to see.
As mentioned by someone above, you can pay for an inspection report by an external company that will check the building standards against current regulations and the original plans and produce a report that may be vital down the line if you have further issues or struggle to rectify this one. Hope it all works out.
The drainage should definitely be installed as per the original plans which should of been inspected very early on by the Building Control representative. However I would say at the moment, with the current climate, not as many site inspections are being completed. They are also not very thorough. I am currently renovating and extending a property and the building inspection regime is me sending them photos to highlight whatever they want to see.
As mentioned by someone above, you can pay for an inspection report by an external company that will check the building standards against current regulations and the original plans and produce a report that may be vital down the line if you have further issues or struggle to rectify this one. Hope it all works out.