Wood – raise floor level and floor over cavity, is there a better solution

flooringwood

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?

Photos:
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Best Answer

I'm not sure what "chipboard" is, but your plan is ok if you use a structural sheet material (OSB or plywood). The span across the wall void is wide enough that you should find a way to support the sheet at the far side, though, or it's likely to flex a fair bit.

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