Rear extensions and where subfloors change
A rear extension added at any point since the 1930s often introduces a different subfloor type or a slightly different finished floor level from the original house, and the threshold between old and new is where problems tend to surface. Checking this junction before fitting avoids an uneven transition later.
- Measure floor levels either side of any extension threshold before ordering flooring
- Later extensions are more likely to have a damp proof membrane than the original build
- A small step or ramp detail may be needed if levels cannot be matched exactly



