What the hell's wrong with you man? This is your physical health and integrity we're talking about, and you can't be bothered purchasing a basic pair of squat stands to safely squat from? Putting a loaded barbell on a couple of chairs is the fucking stupidest thing I've ever seen, an injury or damage to your house waiting to happen.
I cannot believe what kinda tightarses people are when it comes to fitness equipment. Few weeks back I bought a prowler sled for 350 bucks, and a guy I know looks at me in disbelief, saying "you paid that much for a bit of exercise equipment?". Ye man, I did, its my fucking cardiovascular health at stake, I'd spend a hundred grand if that's what it took to get my damn heart and lungs in good shape. Seriously some people...