Saw house, door changed but no Building Control?

[Bbbuyer]

We viewed a house we like and put an offer but not yet accepted. Doing our due dilligence in the meantime and found the following.

Sellers lived for 3 years and renovated a bit one thing they did was change a door in a load bearing wall (I assume load bearing as there is an outside wall above it). Would this change require Building Control Notice/Check? There is nothing in the public register.

See wall between kitchen and garden room/ utility.
We viewed a house we like and put an offer but not yet accepted. Doing our due dilligence in the meantime and found the following.

Is this something to worry about (not being on BC)?. Should we bring this up during negotiation phase? Or wait for survey/solicitor if offer gets accepted?

 

[foxhole]

Not clear which door you refer too? Appears to be two kitchens?

 

[Bbbuyer]

Sorry there are 2 floor plans. Before and after.

Before its kitchen - garden room.
After its kitchen - utility room.

Note on the right side, the end of the house on the first floor is on top of the kitchen green room separation.

 

[freddiemercurystwin]

I wouldn't be that puturbed, if there are no cracks or anything and it was done at least a while ago then it's pretty safe to say whatever was done was done OK. BTW it's unlikely you'd see a Building Control application online.