Owning your own home

Not sure I'd want it connected to the sewer myself. You'd need some kind of u-bend at least.

An in-line fanny trap would / might suffice (although I'm not sure if building regs actually allow it).

What @chiroshi wrote. With a fanny trap to stop the smells.

(* For the life of me, I can't remember what they are actually called in the shops)