Re: overseeding the lawn wasn't successful - now what?
Was this guarantee in writing or implied? If you got this in writing, the original "pro" owes you a green lawn.
Originally Posted by crylakel
It has been my experience, even in ideal conditions, that seed comes in spotty at best, and still takes a very long time to fill in and even remotely become lawn-like, this is why I prefer and recommend sod rather than seed whenever possible.
Overseeding an established but thin lawn usually works quite well. The mature grass holds moisture, shades, and protects the seed/seedling grass, as well as maintains a relatively green lawn and usable surface.
From what you describe, you essentially had no lawn at all, which IMHO, should have been dealt with as clean slate. I would have at least prepped the surface, if not amend the soil, fix/rework irrigation, and laid sod. Had that been done to begin with, you'd have a lush green lawn to enjoy by now rather than be here asking what to do next. This isn't a judgment, just giving you my experience.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!