Thats the whole point they are Not certified aircraft so they are not certificated.
As there are so many variables left to the discretion of the builder,no two are the same, hence stall speeds etc. vary.
edited..
Chox how can your europa have a definitive POH when choices of engines etc ( and therefor all up weight/C of G etc ) will have a profound effect on stall speed and therefor approach speed ?
My point is the previos post made a bold statement in huge red letters that was blatently rubbish.
There are quite a few two seat plans built aircraft currently flying that are restricted to one seat because they were built too heavy in the first place.The landing speeds will vary enourmously.
I own 4 permit to fly aircraft, none of them have a POH so by the previous poster's reckoning I can not fly any of them!