Two storey extension.

[1983]

Hi,
My mums neighbours are planning a two storey extension at the rear of their property. It's a semi detached with my mums house. The height of the extension will be overbearing and windows will now look into my mums garden. There may also be shading to her bedroom window but I'll have to check properly. The new bit is being built on top of an existing single storey extension that is right on the deviding line between the properties.
What if any are the objections we can use to comment on this?
Edited to say its in Scotland.
Tia

 

[noseall]

The height of the extension will be overbearing and windows will now look into my mums garden.

Surely the extension height will be no different to the existing house and I'm pretty sure that both your mum and your neighbours can look into each other gardens from your existing bedroom windows already?

 

[1983]

The existing single storey extension actually provides privacy. You can't see into garden from bedroom windows at the moment. Small gardens.

 

[noseall]

Yes but, people the world over can look into each others gardens from bedroom windows so this can not form a basis for complaint or objection.