I pay £250 for advertising, credit check and initial contract….. just to be watertight and have some recourse if required. Did inventory myself, manage myself, open a DPS account myself etc. If the house is in good nick and you get a good tenant management is minimal i.e. a yearly gas check and a signed covering letter to say the original (agency produced) contract remains extant or add amendments.
HTH
EDIT: WHS sell contracts I think for about £25, so if you want to do the leg work yourself it can probably be done for sub £100. I just like the feeling of having someone to blame (although how fruitful this would be I’m not sure) should it all go tits up!
EDIT AGAIN: EPC was included, no idea they were that expensive. Especially as the last one involved a spotty kid asking if we ever got cold!