I've been nervous about this throughout our build and it seems my fears may have been justified. Apologies if this seems convoluted but I'll try to explain as best as I can!
We are having a 3x4m rear extension which adjoins two rooms. It is essentially squaring off the existing L shape.
One of these rooms (current kitchen) has a step down to it of about 40mm.
Our plans include levelling the floor to align to the rest of the house, so include raising the current kitchen floor.
I spoke to the bricky on a couple of occasions as it looked to me that he was using the kitchen floor level as his guide for the new build.
I was told, no it was fine. It would all be raised when the slab and screed go down.
He also then built the opening for our French doors in line with this seemingly lower level. Again, I queried it and the main contractor said he had allowed for a tolerance so there would be room to raise the floor and fit the doors too.
Having been out to measure this, the door opening is currently 2100mm. The doors we have ordered are 2050mm. This leaves 50mm to play with.
I was reasonably OK with this explanation... But once the knock through happened it became clear that the difference in floor level is actually closer to 100mm. This is to the top of the concrete slab.
I cannot for the life of me see how this will work. We can only come up a max 50mm to finished floor based on the window opening.
We are also planning on having wet UFH so the floor level will come up even more.
What on earth could the solution be? Make a bigger door opening, which would presumably have a knock on impact on the steel and roof above it, or try to lower the floor in the existing part of the house?
I really don't want to have a step half way through the open plan kitchen diner. I'm not even sure it would work as we are having an island in that space anyway.