Estimating dumpster size

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When you're doing demo how do you calculate your dumpster needs? I'm curious how others do it. In my experience, for residential, I estimate about 30 yards per 750 square feet of home. What do you think?

[JD Martin]

No good way really because it just depends on the house. I have used 10, 20 and 30 yards from the City on my properties. Where I am, the 30 is for heavy demo - it's the biggest the city will allow to be parked in the street - and they give you one free haul-off when you rent it, so typically I will get 2 hauls. Last one I used was on a 2br 900sf house with most of the furniture left behind, a full kitchen & bathroom demo and 3 old water heaters left in the basement - though these were "stolen" by local dumpster divers, much to my delight since it saved me space and cost for hauling. That took 2 full hauls. Abandoned furniture is the worst because it takes up a ton of space. Demo usually packs in pretty tight.