We have had two walls removed to open into an extension (340x320cm) and to add french doors to the extension. We face 2 issues:
- The dining room floor is at a slightly lower level to the kitchen either side of the now gone wall.
- The floor does not reach the door because of the cavity. (And also its slightly lower level than the door)
My thinking is to lay 22mm chipboard sheets over the dining room floor and screw them into the subfloor boards. Where these reach the door my thinking is have them overhang the cavity as it is only a small gap they should be ok anchored into the existing floor?
Is there a better approach?