Touring Tyres / Touring Tyre Size

Simple, and possibly stupid question, couldn't find it asked elsewhere though it may have been.

I'm having a tourer built in the new year. I've never had one before. In fact, I've never been bike touring before so will be sorting a few weekend trips in the spring.

Given my complete lack of knowledge on the subject, and that I need to know before I specify the frame and that none of my current bikes have the clearance to try anything bigger than a 23c, is there a consensus on an 'average' tyre size for weekend type jaunts.

Depends on how much you are carrying. (more weight means moving to the upper part of a tyres recommended PSI, so skinny tyres quicky become uncomfortable)

But I think 28mm tyres plus full mudguard clearance is pretty standard for a touring frameset.