I've been meaning to ask this for ages but not sure exactly what my question is. The lounge here is being extended by approx 3metres, which is perhaps two-thirds its current length again.
Ignoring small bits like coffee tables and footstools, we basically have one 2-seater sofa and two single armchairs. The sofa doesn't owe us anything but the armchairs are a little newer but they too might go in the end. Just can't picture any possible layouts once the room is going to be longer.
I think the main problem is the fireplace will be at one end of the room and I can't imagine a ( presumably longer) sofa not being directly opposite the fireplace.
Maybe I should upload a diagram. Will see if I can do that.