We recommend an air clearance space of 24" around the grill. If you cook under the eves of your home, you will see some smoke accumulation under the eves. If you can, orient the grill so that it is at a right angle from the wall of the house.
The smoke stained my stucco & soffit. Luckily that's what my friend does for a living and we gave the house a facelift with all new stucco and facia where it was stained. I no longer have it against my house.