[header] How to prevent your litter box from stinking up your house [title] Clean the box daily. [step] One of the best ways to keep the odor from your cat's litter box, from overtaking your home, is to clean the box daily. [substeps] Get in the habit of scooping out feces and urine on a daily basis. 
Determine a set time to do this and make it a part of your daily routine. If you're not using litter that clumps, use a large, metal spoon to pull out the big wet spots as well.