What Size Dumpster for a Demolition Project?

People shop for a dumpster by size, because size is the number on the rental page. On a demolition job that is usually the wrong dial. Debris is heavy, and the haul limit is a weight, so the bin that looks right by volume often breaks the weight limit first. I work out both numbers before picking anything, and the answer is sometimes counterintuitive. These are planning estimates, not quotes.

Two limits, one bin

Every bin has a volume, measured in cubic yards, and a weight limit, measured in tons. You hit whichever comes first. The number of loads you need is the larger of two figures: total volume divided by bin size, and total weight divided by the weight limit, each rounded up.

The weight limit I plan around is 10 tons, since WM roll-offs have a 10 ton limit. Your hauler may differ, so confirm it. The

demolition debris and dumpster calculator

lets you change the max load weight so it matches your own hauler.

A worked example: the same house, three different answers

Take a 1,500 square foot, single-storey house. Using planning figures, a wood-frame version is about 80 lb/ft², or 60 tons, and around 343 cubic yards loose at 350 lb per cubic yard. Here is how the loads shake out with a 10 ton limit:

• 10 yard bin: 343 ÷ 10 is 35 loads by volume, 6 by weight. Volume decides.

• 20 yard bin: 18 loads by volume, 6 by weight. Volume decides.

• 30 yard bin: 12 loads by volume, 6 by weight. Volume decides.

• 40 yard bin: 9 loads by volume, 6 by weight. Volume still decides.

For light framing debris, the bin is full long before it is heavy. Going up a bin size meaningfully cuts the number of loads, down to the point where weight takes over at 6. In practice debris gets compacted or tracked down by an excavator, which raises the effective density, so I treat the loose density figure as adjustable. Change it if your crew packs the bin tighter than the default.

Now switch the material. A 1,500 square foot steel-and-concrete building at about 200 lb/ft² is around 150 tons, and roughly 333 cubic yards at 900 lb per cubic yard. A 40 yard bin needs 9 loads by volume but 15 by weight. Weight decides, and picking a 30 or 40 yard bin barely changes the count. You pay for 15 hauls whatever size sits on the pad.

When a bigger bin helps and when it does not

A bigger bin helps when you are volume-limited, which is typical for wood framing, drywall, and general interior strip-out. It does nothing when you are weight-limited, which is typical for concrete, brick, block, and foundations. In that case the right question is the opposite one: could a smaller bin do the same job at a lower rental cost per load? Some haulers restrict heavy materials to smaller bins on purpose so the truck can lift them. Ask your hauler before assuming a large bin can take concrete.

A 4 inch slab shows the pattern clearly. At about 50 lb/ft², a 1,500 square foot slab is roughly 37.5 tons and 54 cubic yards at 1,400 lb per cubic yard. A 10 yard bin is limited by volume at 6 loads against 4 by weight. A 20 yard bin is limited by weight at 4 loads against 3 by volume. Every bin above that is also 4 loads. The big bins stop helping at the weight limit.

Sort first and the picture changes

Mixing everything into one bin is easy, but it is not always cheap. For a concrete number from Fort McMurray, the Regional Municipality of Wood Buffalo 2026 fees schedule lists mixed construction and demolition waste at $180 per tonne unsorted and $115 per tonne with recyclables removed, plus a $50 scale fee per visit. See the

RMWB 2026 fees, rates and charges schedule

and confirm current rates before you budget.

Sorting means separate bins for clean concrete, metal, and wood, which can change both the bin count and the disposal bill. It also changes the weight profile: a bin of only clean wood is volume-limited, and a bin of only concrete is weight-limited, so each bin can be sized for what it holds. The catch is more bins on site at once, and less room to work.

Rental terms to check

I have not included rental prices here, because they vary by hauler, bin size, and season, and I would rather you get a real quote than rely on my number. What I would check on any quote:

• The rental period. WM's standard rental is 7 days, which a multi-week demolition will outrun.

• The weight limit and the overweight charge per ton.

• Whether disposal is included or billed separately by weight after the haul.

• Restrictions on materials like concrete, shingles, or anything hazardous.
• Placement: access, permits, and a firm surface the truck can load from.

Putting it together

Estimate the weight from floor area and structure type. Estimate the loose volume from a density. Compare loads by volume and by weight for each bin size and pick the size where the count stops dropping. If you are weight-limited, stop shopping for a bigger bin. If you are volume-limited, a bigger bin saves hauls. For the weight estimate itself, see

how much debris demolishing a house creates

.

For a local ballpark on the demolition itself, not just the bins, a Fort McMurray contractor offers an estimator at

Demolition Dogs

. And whatever tool you use, treat the output as a ballpark and confirm it on site before you book anything.