To think neighbours are being selfish over extension?

[nearlynot]

Extension is ground and first floor, 5.5 meters long, with ground level extending a bit further. West facing.

Is neighbour BU to object if half the garden will have no extension or shadowing. Neighbour always home and claims it will be detrimental to have shadow over back of the house/windows. Who is BU?

An email from who?

There is no right of appeal for third parties in the planning system. It is only possible to challenge the decision through the courts on a point of law ie incorrect procedure etc, not the actual planning merits of the proposal. It is unusual to do this with regard to an extension, and unfortunately costs a bloody fortune.

This is a reverse! Just answer questions properly

Sorry I've just RTFT

OP I really hope you can get something sorted - I would object. It looks huge.

Apologies again for not RTFT.