Quick Answer: Demolition takeoff means measuring the area or volume to be removed, counting the fixtures and components coming out, sizing the haul off and disposal, and separating salvage and recycling. Good software reads the demo plan, distinguishes selective from total demolition, pulls area and count off the scaled drawing, and gives you a defensible takeoff tied to each sheet and room.
What Trade Specific Takeoff Means
Demolition typically sits in CSI Division 02, and it is one of the few trades where the drawing is mostly a note set rather than a dimensioned plan. A takeoff that gets the square footage right but misses the fixtures or the disposal will leave money on the table or lose the bid. Trade specific takeoff for demolition means the software understands the difference between selective and total demolition, knows that a slab on grade comes out in cubic yards while a partition wall comes out in square feet, and knows that what you remove is not the same as what you haul, because demolition swells.
Generic area tools will tell you the demo footprint is 4,000 square feet. A demolition takeoff tool tells you there are 4,000 square feet of total interior demo, 320 square feet of partition removal, 18 fixtures to pull, 240 cubic yards of slab and footing removal, and 300 cubic yards of haul off after swell. That is the difference between an area and a takeoff, and it is the difference between a number and a bid.
What Counts on the Drawings
Demolition quantities live on the demo plan, the key plan, and the demolition notes, and they are shown with hatching, notes, and callouts rather than dimensions. The pieces you have to pull include selective demo area by room or partition, total demo area by floor, slab and footing removal in cubic yards, and ceiling and roof removal in square feet. You also have to count the fixtures and components: doors, frames, windows, plumbing fixtures, light fixtures, ductwork, conduit, and equipment marked for removal.
The notes carry as much information as the plan. The demo notes tell you whether a wall is a full removal or a removal to structure, whether the slab is full depth or shallow, and whether the utilities are to be capped or re routed. The key plan tells you which floors and rooms are in scope and which are not, because selective demo is room by room, not building wide. A good takeoff reads the plan and the notes together, because a hatched area on the plan means nothing without the note that says how deep it goes.
Disposal, salvage, and protection are separate lines that get missed. Haul off is the removed volume times a swell factor, salvage and recycling are tracked separately because they credit the job, and temporary shoring, dust control, and utility disconnection are labor and material lines that show up on every demo bid. A takeoff that ignores those lines underprices the work that runs alongside the actual removal.
What Good Takeoff Software Does for This Trade
Good demolition takeoff software reads the demo plan, recognizes the hatching and notes that mark removal, pulls area and count off the scaled drawing, and separates selective from total demo. It treats the notes as data, so a callout that says remove slab to 4 inches deep becomes 4,000 square feet at 4 inches, which is a cubic yard number, not a square foot number. It separates removal from haul off, because a cubic yard of slab in place is not a cubic yard in the dumpster.
Confidence flags matter on demolition because the scope is driven by notes, not dimensions. A partition misread as total demo when the note says remove to structure doubles the line, and a fixture missed entirely means it was never priced. Software that flags low confidence on a hatched area or a fixture callout and shows you the note it read lets you verify the risky lines before the bid goes out.
Must Have Features
- Area and volume off the scaled plan. The software must pull square feet of partition and ceiling demo and cubic yards of slab and footing removal off the scaled drawing, not ask you to key it in. Manual area takeoff is where the errors live.
- Note and callout reading. It must read the demo notes that say remove to structure versus full removal, slab depth, and utility capping, because those notes drive the quantity.
- Fixture and component counting. It must count doors, frames, windows, plumbing fixtures, light fixtures, and equipment marked for removal, because those are unit priced lines.
- Haul off with swell factor. It must apply a swell factor to the removed volume so haul off and disposal are reported in the units the dumpster and the tip fee bill in.
- Salvage and recycling lines. It must track salvage and recycling separately from disposal, because salvage credits the job and disposal costs it.
- Confidence flags with the note shown. High, Medium, or Low on every line, with the note or callout the software read displayed so you can verify the risky items fast.
What to Watch Out For
The biggest trap in demolition takeoff is software that gives you a square footage and calls it a takeoff. If the tool measures area but cannot read the notes that set the depth or the scope, you still have to do the volume and the fixture math by hand, and that is where most estimating errors happen. Another trap is tools that ignore the swell factor, because a cubic yard of slab in place is not a cubic yard in the dumpster, and a takeoff that reports removed volume as haul off underprices the disposal every time.
Fixture counting is a common gap. Some tools measure the demo area fine but never count the doors, lights, or plumbing fixtures, and those unit priced lines get missed entirely. Salvage and protection are another gap, because salvage credits the job and protection is a real labor line, and a takeoff that misses them misses money both ways. Finally, watch for tools that do not show their work. A square footage number with no hatched area, note, or room behind it is a number you cannot defend in a bid review.
How CyanBuild Fits
CyanBuild reads the demolition plans and notes, measures selective and total demo area, counts fixtures and components, computes slab and footing removal in cubic yards, applies a swell factor to haul off, and reports salvage and recycling separately. Temporary shoring, dust control, and utility disconnection are tracked as their own lines. Every line carries a confidence flag and the note or callout it was read from, so you can verify the risky lines and defend the rest. The export is a line item takeoff tied to sheet and room, ready for pricing.
Putting It Together
Demolition is a note trade, so the software you pick has to read notes, not just measure area. It has to separate selective from total demo, convert area to volume where the scope calls for it, count the fixtures, apply a swell factor to haul off, and show the note behind every number. Get those things right and your bid is defensible, your dumpster order matches the drawings, and the only surprises on the job are the ones hidden behind the walls.