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Totally possible, given how this house has seemingly been abused in every conceivable way, the masonry on exterior seemed fairly untouched, by which I mean it was as fucked as the rest when we had it repaired, but I guess the lintel could have been replaced from the inside.
Speaking of lintels. How much height could I gain in a doorway by replacing what's probably a concrete lintel with a catnic one? I have a window at the back, cavity wall, that would make an excellent patio door on to my garden, but it's only about 1.8m high.
Given the UPVC windows, it's possble that it's been messed with.
Worst that could happen is the curtain track* is pulled out though, I guess.