It's all in the title really. I am preparing for a new lawn in the back. The existing one is uneven and all different colours and patchy. I have done all of the decking to the height we require for the house etc. Now for the lawn. I understand all of the preparation etc. But the one thing that is confusing me is whether to kill the existing grass or dig it up and remove it ? My younger brother worked with a landscaper for a few years when he left school so has some experience in this and he said to kill it. But the more I read on the net I suspecting that removing the existing grass would be better. Any advice, preferably from people who have done this or any experts out there. Thanks.