Changing builds location of installed runner

I am running the community edition of gitlab on premise (omnibus). I have two runners installed on the same server as gitlab so everything is on one box.
When I first installed runners things went into the /home/gitlab-runner/build ect folder. I now have a larger disk installed and would like to relocate where the runners do their business. I changed specified a builds_dir in config.toml to the new disk/foler location and when I run the pipeline I am getting error about mkdir and permission denied. I have ensure permissions are all correct. At a bit of a loss on how to migrate the builds folder to a different location. Any help appreciated. One thought I had was use a symolic link and not edit the config.toml file at all but decided not to after I found the build_dir option.
Any thoughts