like what tat tong says. I mobile record all the time, either next to a metalcore hard hitting neighbouring band in the jam room, or one of the band member's place outside them blasting Xbox live laughing away etc. it's not exactly a MUST that you have to have a nice soundproof/acoustically treated room just to record. not everyone can afford that, but at least the basics : outside don't be too loud, and everyone in the recording vicinity have a cup of shut the love up. if you're REALLY particular, why are you recording at home in the first place? go to a real studio. if not, you're more likely to be hallucinating the noise louder than the noise getting recorded into the mic itself.
then again this is just my 30¢ worth.