I've got about 500 sq feet of yard that I would like to renovate. I want to bring in about 10 yards of topsoil to build up the depressions, etc.

My question - can I just place 4 - 5 inches of topsoil over the existing lawn then reseed? or do I need to kill the grass first, cut it short or take all of it out?

Thanks for your help

Pacific NW