for the following 3 scenarios:
A serving hatch between a kitchen and a dining room to be opened up into a proper door frame and door with a lintel installed? This is a single skin breeze block internal wall on a concrete floor that is plastered on both sides. Upstairs on this wall is a timber stud and partition wall. Above this is Fink Trusses and the stud and partition wall runs parallel to the trusses.
Bricking up an existing doorway between the kitchen and the utility room, and creating a new doorway 1.2metres further along the wall near to where it meets a double skin external wall. Again the wall is internal breeze block, plastered on both sides and on a concrete floor. All that is above it is some joists that form part of the bedroom floor above it.
Putting in a stud and partition wall in the utility room (smaking it smaller) to them permit an opening made beween the downstairs toilet and the now walled off part of the utility room to permit the installation of a shower in the downstairs cloakroom. This wall supports two landing floor joists only so again a lintel will be used.