Unlikely, as this would be indicative on the adjacent front elevation also.It looks to me like there may have been stone stone coins in the corner and rather than repair they have put some brick in?
What backs up my theory of a previous building being present is the evidence of sooted bricks showing at the bottom centre of the gable elevation.
Maybe an old fireplace?
Could be wrong on all counts of course. What is true though is that the side elevation brickwork is completely different to that of the front elevation and that it appears that it is of 'common' standard.
It also appears that higher up the gable, I.e. above window height, the brickwork resumes to best quality standard.
This may be that the demolished building was lower than its neighbour.
Very interesting thanks!
Here's a few more images to get a better idea of the property...