Do all building work next eg paths, patios, drives, fences, walls, bases/foundations for sheds, glasshouse, garage, summerhouse, pond, raised beds, electrical installations (and draw a plan of buried cables for future reference by you and next occupants).

If a manhole cover is higher or lower than the surrounding area, see if the hole is constructed in sections. These can be removed or added to.

After the building work is complete, check that ground levels are still OK. Are gradients gentle and will the lawn be easy to mow right up to its edge?