What Size Dumpster Do I Need? A Texas Homeowner's Guide

If you’ve never rented a roll-off before, sizing is the part that trips people up. The yard numbers — 15, 30, 40 — refer to volume in cubic yards, but most folks have no intuition for that. A cubic yard is a 3 ft cube. A 15 yard dumpster is fifteen of those cubes worth of empty space, give or take.

That doesn’t help you decide. So here’s how to think about it the way we do when someone calls us.

Start with the project, not the size

The single best predictor of dumpster size isn’t square footage or budget. It’s the type of debris and the length of the project. A garage cleanout with a lot of cardboard and old furniture eats space quickly but weighs almost nothing. A bathroom tear-out with cast iron tub, tile, and mortar weighs a ton in a few square feet.

We’ve sized hundreds of jobs across Boerne, Fair Oaks Ranch, Bulverde, Mount Vernon, and the surrounding counties. The pattern that holds: people overestimate weight and underestimate volume.

The 15 yard: the workhorse

Our 15 yard roll-off is the size most homeowners actually need. It’s roughly 14 ft long, 7.5 ft wide, and 4.5 ft tall — the side walls are low enough that you can throw bagged debris in without a ladder.

It works for:

• Garage and shed cleanouts — even the heavy ones
• Single-room remodels — kitchen, bathroom, or bedroom
• Roofing tear-offs under about 25 squares of asphalt shingles
• Yard waste and tree work — branches, brush, sod
• Flooring removal for a typical 1,500–2,000 sq ft home
• Estate cleanouts for a moderately full home

If your project sits in any of those buckets and you don’t have unusual quantities, a 15 yard is the right call. It also fits more easily on tight Hill Country driveways and curves where a 30 might give us trouble.

The 30 yard: when you cross the threshold

The jump from 15 to 30 isn’t double the volume in practice — it’s roughly double the capacity but the dumpster is taller, longer, and harder to load by hand. You’re looking at about 22 ft long and 6 ft tall on the sides. Throwing things over the wall starts to be a real workout.

You want a 30 yard when:

• You’re doing a whole-home renovation with multiple rooms going at once
• The project is a large addition or major demo
• You’re handling commercial cleanouts — office, retail, light industrial
• The job is going to run more than a couple of weeks and you want to avoid a swap
• You’re combining roofing with construction debris in one rental

A common move on residential builds is to go with the 30 yard for the demo phase, then keep it on site as the framing and finishes generate steady debris.

The 40 yard: the big one

The 40 yard is our largest container. Same length and width as the 30, but the sides are 8 ft tall. It’s a serious piece of equipment and it isn’t always the right answer just because the project is big — heavy debris like concrete, brick, or shingles will hit the legal road weight limit long before the box looks full.

The 40 yard makes sense for:

• Whole-home demo or full property clearing
• Large new construction generating lightweight bulk debris (insulation, drywall scrap, packaging)
• Industrial and commercial cleanouts where the volume is high but the weight per cubic yard is moderate
• Projects where having one larger container is logistically simpler than swapping a 30 mid-job

If you’re not sure whether you need a 30 or a 40, call. We’d rather spend five minutes on the phone than have a customer pay for capacity they couldn’t use.

What weight has to do with it

Every roll-off has an included weight allowance. If you exceed it, there’s a per-ton overage fee. The reason this matters for sizing isn’t the cost — it’s that volume isn’t your only constraint.

Some real-world rules of thumb:

• One pickup-truck load of household junk ≈ 3 cubic yards
• One square of asphalt shingles ≈ 250 lb
• A standard cast-iron bathtub ≈ 300 lb on its own
• One cubic yard of dirt or gravel ≈ 2,500–3,000 lb (yes, really)

Dirt, concrete, brick, tile, and roofing all weigh a lot. If your debris stream is heavy, the right move is sometimes a smaller container loaded fully rather than a bigger one half-loaded — because you might hit the weight limit before you hit the height limit either way.

How to estimate your volume in 5 minutes

Here’s a method that works:

1. Walk the project area with a phone or notebook.
2. Count the major items — furniture pieces, appliances, doors, cabinets — and assume each chunky item is about half a cubic yard.
3. Estimate bagged debris — every 13-gallon kitchen bag is roughly 1.7 cubic feet, so it takes about 16 bags to fill a cubic yard.
4. For remodel debris, take the room’s square footage and multiply by 0.3 if you’re tearing flooring, 0.5 if you’re tearing drywall and flooring together, and 0.7 if it’s a full gut job.
5. Add a 20% buffer. People always underestimate.

If your number lands under 12 cubic yards, get the 15. Between 12 and 25, the 15 still works for most projects but the 30 is safer for weeklong jobs. Above 25, go 30. Above 35, go 40.

A few things people get wrong

“It looks bigger than I need.” It usually doesn’t. Once debris is in the box, it doesn’t compact. A couch you crammed into a garage takes up its full volume in a dumpster.

“I’ll just rent two small ones if I run out.” That’s twice the delivery and pickup fees. Almost always cheaper to size up.

“I’ll fill it past the top.” Texas DOT rules don’t allow it. We can’t legally haul a load that’s over the rim. Plan to fill to the line, not past it.

“Heavy stuff at the bottom.” Yes — but also load with a plan. Long flat items first, then bulky items, then fill voids with smaller debris. We see boxes that look full but are 40% air.

When it’s still okay to call

Honestly, even after reading all this, the easiest way to size a roll-off is to describe the project to someone who has heard it a hundred times. We’re not going to upsell you. A correctly sized rental is a happy customer, and happy customers are how a small family business survives.

If you’re in Boerne, Fair Oaks Ranch, Bulverde, Comfort, Mount Vernon, Mount Pleasant, Sulphur Springs, or anywhere nearby, give us a ring at (903) 806-4181 or book online. Two minutes on the phone beats two hours of guesswork.