I used spareroom and never bothered with a written contract, I used the technique of telling EVERYBODY that somebody had already seen room and had first refusal – as it gave me a nice way to say no if I didn’t like the look of them.
may impact council tax (single person discount)
need to tell mortgage and insurance companies
(both were ok with me BUT they did not cover theft by lodger …..)
get lodgers email and phone no ,do a internet search (facebook etc etc) etc etc to see what you find
if they move in get a photocopy of lodgers passport/driving licence etc just in case
need to have discussed and agreed house rules – and remember it’s a two way cut – your house/but they pay to live there – so noise, responsibilities, partners, cleaning, heatring, who pays what ……….