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No Problem.. I'm based in NI, but over here you can get building control to do a retrospective approval.. they will call out and have a look and as long as it's got decent bearing at each end it should be fine.
That RSJ look massively over specced.. An opening that size could be done with a concrete lintel
Technics100
Just seen this super useful diagram, thanks so much for knocking it up. Makes understanding a lot easier when inevitably things can get lost in translation. I'll look again with the torch to see if I can see said padstones and if not peel more plaster away.
@tgr @bigshape thanks for explaining this. Do you think you could expect your usual builder to know about these things? If you don't know no worries, you've all be so useful already.