On Fri, 16 Jul 2004 20:52:30 +0100, a particular chimpanzee named
"G&M" randomly hit the keyboard and
produced:

"Peter Gray" wrote in message
...

If you've got one of the BCOs I deal with, he'll want all the calculations
in triplicate even for a 27" doorway.

However, we might also want to
widen an existing window so it would be perhaps 2-2.5m wide. So I guess my
question is, should I be getting the engineer to specify on the windows
too,

No BCO I know would worry about a simply supported beam for less than
a couple of metres. Anything over that, and it may well depend on the
BCOs experience, etc. as to whether he's prepared to accept your
chosen section without substantiation. It depends more on the
distribution of loads over; for example if you have a beam bearing
onto the wall immediately above where you want to install the lintel,
then calculations will almost certainly be asked for.
--
Hugo Nebula
'What you have to ask yourself is,"if no-one on the internet wants
a piece of this, just how far from the pack have you strayed?"'