hi to all users.I m new in uk and i had got a job in here as a cad operator previously i was doing in inches and feet but now its totally different in cm and mm. My question is can it is possible that someone gave me some kind of stander ed sizes mean heights , lengths, width of a house what is the ceiling height and what is from ground level and the main thing is how to elevation i just don't understand the bay windows. i also need the normal size of a door and windows.thank you 

Have you tried looking for a good reference book similar to the classic one used in the U.S. (Architectural Graphic Standards)?  Such as...Metric Handbook: Planning and Design DataPrinciples of Architectural Drafting: A Sourcebook of Techniques and Graphic Standards