My Builder is digging out for my extension and dumping tons of earth on my back lawn Neighbours are complaining.

[Koolpc]

You could use it as a burial mound if it goes high enough!

 

[Harry Bloomfield]

You could use it as a burial mound if it goes high enough!

Might that need a Viking ship?

 

[^woody^]

I don't think the OP wants another barrow in the garden

 

[Harry Bloomfield]

I don't think the OP wants another barrow in the garden

Long barrow?

 

[^woody^]

 

[accelerator]

Yes my Builder is dumping tons of earth from my extension dig and raising my back lawn making it several feet above my neighbours gardens, they are complaining that it affects their garden privacy and drainage and it should be skipped, one says that his fence is not a retaining wall so shift it.
My Builder says its saving money and its fine to change the levels on my own property. Who is right ?

The builder is wrong and the neighbour is right. Your builder should be removing the waste unless otherwise agreed.