Jack O

What are the normal in-ceiling heights you have come across for higher-end flats? The developer states the in-ceiling height is only 100mm. Photos I took towards the beginning of the building work suggest it might be higher + one TV ceiling installation Company didn't believe the 100mm height. I am moving into a new-build flat in a month on the ground floor [building has three floors]. I wish to install an in-ceiling fold-down television. that requires a 200-250mm depth. Thank you!