Slabbing below airbrick

[swaring]

Hi guys,

Wonder if anyone can help. Recently moved into a new build. There are airbricks all around the house, I want to start slabbing the back garden but do not know how far below airbrick I need to go. The builders have left a miss mash of levels. The current cheap slabs are 1 brick below and the grass is 3 bricks below. Can someone advise. I will attach some photos.

Your help is much appreciated.

 

[lonner]

Lay as per the ones already there,maintaining the gravel strip.
As the lawn level drops away simply follow the level unless you want to have a step down or re- turf?

 

[swaring]

Thank you so much. I wanted slabs where the lawn is . Much appreciated.