Price demolition by what is coming out and what it weighs, never as a flat day. HomeAdvisor's June 2026 figures put interior demo at $2 to $7 per square foot of floor, with $1 to $5 of that in labor, and the gap between the two ends is almost entirely disposal and layers. A 30-yard dumpster is rated for 2 to 4 tons by Dumpsters.com. One contractor on the Fine Homebuilding forum weighed the lath and plaster from 900 square feet of 8-foot rooms at about 12,000 pounds, which is six tons. Two tons over the box limit is a bill that arrives after you have been paid, and it can be the entire margin on the tear-out. The method below prices the surface, the weight, the protection and the test as separate lines, so the number you give is one you keep.
What should demolition cost per square foot?
Treat the per-square-foot number as a check on your answer, not as the answer. HomeAdvisor's $2 to $7 is per square foot of floor, and a floor figure cannot tell plaster from drywall or tile from carpet. A 100 square foot bathroom has roughly 320 square feet of wall at 8 feet, plus a ceiling, plus the floor, plus whatever is in the tub surround. The floor is the smallest surface in the room.
So count surfaces. Walk the room and write a line for each material you will remove, with its own square footage.
| Line | Measure it as | What moves the price |
|---|---|---|
| Wall finish | Wall sq ft, per material | Drywall vs plaster, tile over either |
| Ceiling | Ceiling sq ft | Plaster, popcorn texture, drop grid |
| Floor | Floor sq ft, per layer | Tile on mud bed, glued hardwood, vinyl under tile |
| Cabinets and fixtures | Per unit | Tub, vanity, uppers, lowers, appliances |
| Partitions | Linear ft | Load-bearing or not, what runs inside |
| Disposal | Tons, then boxes | Density of the above |
| Protection | Per room, per day | Occupied house, finished floors en route |
| Testing | Per sample | Age of the house |
HomeAdvisor's room totals, $500 to $3,000 for a kitchen and $1,000 to $2,300 for a bathroom, are where a homeowner's expectation sits. Yours should land on the surface count, and when it lands higher the table is how you explain it.
How many labor hours does a two-person demo crew need?
Start from a half day per plain room and adjust for what is on the walls. The Fine Homebuilding thread puts two careful workers at a little over half a day for a bedroom, and that is for lath and plaster with the lath knocked clean. Drywall is faster. Tile on a mud bed is slower than both.
Pay for that time at a real rate. The BLS median for construction laborers and helpers was $22.44 an hour in May 2025, and HomeAdvisor quotes demo labor at $40 to $45 an hour per worker, which is about where a wage lands once payroll tax, workers comp, insurance and the unbillable hours are on it. If you have not done that math for your own crew, work out your true hourly cost before you price another tear-out, because demo is the one trade where every hour is labor and nothing is markup on material.
A 10 by 12 bathroom, tile floor on backer, tile tub surround, drywall elsewhere, one vanity, one tub:
| Task | Crew hours (two people) |
|---|---|
| Protection, zip wall, floor paper to the door | 1.5 |
| Fixtures out, caps on supplies | 2 |
| Tile surround and backer | 4 |
| Drywall, ceiling, trim | 3 |
| Tile floor and backer | 4 |
| Load-out, sweep, nails knocked in | 2.5 |
| Total | 17 |
At $45 an hour per worker that is $765 of labor before a dumpster shows up. Your hours will differ. The shape of the list should not.
How do you size the dumpster by weight instead of volume?
Add up pounds first, then pick the box. Dense debris hits the weight limit before the box looks full, and the hauler weighs it on the way out.
| Material | Weight | Source |
|---|---|---|
| 1/2-inch drywall | 1.8 lb per sq ft | Dumpsters.com |
| 5/8-inch drywall | 2.2 lb per sq ft | Dumpsters.com |
| Carpet | 0.5 to 2.2 lb per sq ft | Budget Dumpster |
| Lath and plaster | about 13 lb per sq ft of floor area, 8-ft rooms | Fine Homebuilding thread, one job |
| Ceramic tile and mortar | 1,800 to 2,300 lb per cubic yard | Mazza Recycling |
| Broken concrete | about 2,025 lb per cubic yard | Budget Dumpster |
Then the limits. Dumpsters.com rates a 10-yard at 1 to 2 tons, a 20-yard at 2 to 3 tons, a 30-yard at 2 to 4 tons and a 40-yard at 4 to 5 tons, with heavy-debris boxes rated up to 10 tons for concrete. Read that table once and the trap is obvious: the 40-yard box holds twice the volume of the 20 and barely more weight. For plaster or a mud-set floor the right order is a small heavy box, not a big one.
Two things from the thread that pricing guides never mention. Separate the plaster from the lath and load the plaster first in an even layer, because mixed together the lath makes a pile of air that fills the box at a third of its weight limit. And drivers will refuse or part-empty an overweight load. One contractor in the thread watched that happen on a plaster job. The reload is your crew's time, and nobody is paying for it.
What should protection and dust control cost?
A line, every time, even when it is small. Rosin paper or Ram Board from the front door to the room, a zip wall at the opening, plastic over returns and supplies, a HEPA vacuum on the saw. In an occupied house with finished floors, an hour and a half of setup is cheap compared with one gouged oak tread. HomeAdvisor's $2 to $7 range assumes some of this is in the number. Yours should say so in words, because the homeowner cannot see protection in a per-square-foot price and will ask why the neighbor paid less.
When does the house need lead or asbestos testing first?
Paint: any house built before 1978. The EPA's RRP rule requires a certified firm and lead-safe practices once you disturb more than six square feet of painted surface in an interior room, or 20 square feet outside. A gut of one room clears that threshold on the first wall. If you are not certified, the test is not optional, and neither is the sub who is.
Asbestos: older than 1980, test before anyone swings. Floor tile and its mastic, joint compound, textured ceilings, pipe wrap and duct tape are the usual suspects. The federal Asbestos NESHAP excludes residential buildings of four or fewer units, and its removal thresholds of 260 linear feet, 160 square feet or 35 cubic feet are written for larger facilities. That does not let you off. States set their own residential rules, and many landfills will not accept the load without a survey. HomeAdvisor puts removal at $1,200 to $3,000, which is a separate contractor and a separate line, and the sample fee that finds it is a line too.
Write the test as its own item with its own price. A test buried in the demo number looks like padding when it comes back clean and looks like a cover-up when it does not.
Where does demo pricing usually go wrong?
The flat day. You look at a kitchen, think "two guys, one day, one box," and write $1,800. Then the floor comes up and there is sheet vinyl under the tile, and plywood under that, and the plywood is glued and screwed to a second subfloor. The day becomes two and a half, the 20-yard box is over its 3 tons on the first afternoon, and the second box is yours to pay for.
Price per layer you can see and name the ones you cannot. Pull a register, lift a threshold, look in the closet where the flooring was never redone. Write what you found and what you did not look for into the estimate itself: "Removal of one layer of floor tile and backer. Additional layers found beneath, if any, priced on discovery at $X per square foot." Now a second layer is a change order with a number already agreed, not an argument in a kitchen with no floor. Put hidden layers next to your other written exclusions and keep them there on every remodel.
Smaller leaks, same cause. Nails knocked in or pulled on every stud after plaster comes off, which the thread's contractors flag as the thing everyone forgets. Capping supplies when the vanity comes out. Carrying the debris through a house that is longer than the room. Each one is half an hour nobody wrote down.
What this misses
The weights come from hauler tables and a single forum job. Plaster thickness and mud bed depth will move the tonnage. So will how carefully you separate. Weigh your first few loads against the ticket and build your own table.
Dump fees are local. HomeAdvisor's $200 to $1,000 range is national. A tile load in a county with a C&D recycling mandate prices differently from one that takes it mixed.
Structural demo is a different estimate. A load-bearing wall carries engineering, temporary shoring, a permit and an inspection, and none of that is in the hours above.
Hazardous findings reset the job. If the test comes back positive, the demo stops and the schedule belongs to the abatement contractor. Nothing here prices that.
The surfaces and the weight are both visible while you are standing in the room, and so is the threshold you could have lifted. The reason they go missing is that by the time you write the estimate you are sitting somewhere else, and the vinyl under the threshold is a memory. BidWalk captures each surface as you walk the room and talk, so the demo lines exist before you leave the house and the dumpster is sized from what you actually saw.
