New roof slates question

[IamGroot]

Good morning.....hoping one of you lovely people here can give me some advice here. Recently had a new roof and the roofer has overlapped our new slates (the property on the right) with the tiles on our neighbours to the left. Now apart from the fact this finish looks bad, is this a normal thing to do, or should this be done some other way? Appreciate any suggestions. Thanks

 

[datarebal]

Very poor. I would expect your neighbour to kick off.
There is obviously a fire break wall there hence the bump.
There was no need to do this in such a shoddy way.
With dissimilar size slates there are two main joining options . Soakers or bonding gutter.
Either of these would make it possible to get a reasonable join.
Especially if they used the centre line of the chimney as the join line .
Not good.

 

[IamGroot]

That’s great information, really appreciate your time to respond. I knew it wasn’t right, I just didn’t understand the technicalities involved.

thanks again, all the best

 

[catlad]

That result stems from not knowing what you are doing!

 

[Alastairreid]

State the obvious, bloody awful, clueless, no pride in their work.