Hi Tig
I appreciate your explanation. It is when I measured the house I was compfortable with imperial as that is what I grew up with. But England and my job went metric and I got along fine with it. As I retired 6 years ago and found SU thats when I decided I would model my house. "You can't teach an old dog new tricks" is half right. In work I used metric quite easily and had no problems. But the regular door, window, etc.,sizes I could "see" in my head if they where wrong especially when They where out slightly. But if it was metric its not so obvious so I have to measure it exactly, and keep doing this, (which I would get to know like imperial), i'd have no problem. But the trouble is I am new to SU so I make a load of mistakes which takes time to correct. Thats why, at the moment, I'll stick to imperial.
I glad it doesn't matter what it is as long as it comes out OK. But I will go back to metric - honest.
Thanks for your reply
John