Owners and developers usually ask for a price per square foot. It's a fair question, and for houses it's at least a rough guide. For commercial buildings it falls apart fast. A one-story block retail building with a clean survey and a slab left in place is a different job from a two-story concrete office with a post-tensioned deck, a fuel tank out back and a parking lot that has to go. Below is what separates them.
The big drivers
What moves the price on a commercial demolition
| Item | Usually costs less | Usually costs more |
|---|---|---|
| Structure | One story, concrete block or light steel, simple roof. | Multiple stories, cast-in-place concrete, post-tensioned slabs, tilt-up panels or heavy steel. |
| Asbestos | The survey comes back clean or with small amounts. | Abatement is needed before demolition, often roofing, floor tile and mastic, pipe insulation or drywall compound. |
| Below grade | The slab and footings stay, or come out to a shallow depth. | Full foundation removal, pile caps, grade beams, old tanks, buried debris or footings from an earlier building. |
| Site and access | Open lot, room to stage equipment and load trucks on site. | Zero-lot-line building, busy street, sidewalk or lane closures, neighbors that stay open during the work. |
| Paving and site features | The parking lot and landscaping stay. | Asphalt, curbs, light poles, signs, dumpster enclosures and utility structures all have to go. |
| Schedule | Normal working hours, one continuous mobilization. | Night or weekend work, phasing around tenants, or a hard deadline tied to a closing or a construction start. |
One factor rarely sets the price by itself. Three or four on the right side of this table is what makes one commercial quote several times another.
Before anything comes down
Costs that show up before demolition starts
A lot of a commercial budget is spent before the excavator ever touches the building:
The asbestos survey and notice
Every commercial building needs a thorough asbestos survey and a written notice filed at least 10 working days before demolition, even if the survey finds nothing. The notice goes to the county's asbestos program and carries a filing fee.
Abatement, if the survey finds it
Asbestos found above the regulated amounts has to be removed by a licensed abatement contractor before demolition. On older buildings this can be a large share of the total, so get the survey early.
Other hazardous materials
Fluorescent tubes and older light ballasts, mercury thermostats, AC refrigerant, hydraulic elevator oil, grease traps and leftover chemicals all have their own disposal rules. A former gas station, auto shop or dry cleaner is a different conversation.
Utilities
Commercial buildings often have a larger electric service, a transformer on the property, a separate fire line and backflow preventers. Each one has to be disconnected, removed or capped, and the letters collected for the permit.
Permits and site controls
Demolition permit fees, right-of-way or lane closure permits, construction fencing, dust control and, on sites that disturb an acre or more, a stormwater permit and erosion controls.
Structures to ask about
Three things that change the method, and the price
Post-tensioned concrete
Many South Florida parking decks and concrete buildings use post-tensioned slabs. The steel tendons inside are under high tension, and cutting them the wrong way is dangerous. Taking one apart needs an engineered sequence, which takes more time than a conventional slab.
Underground tanks
An old fuel or oil tank changes the job. Tank removal has its own rules and contractors, and if the soil around it is contaminated, cleanup is a separate scope from the demolition.
Shared walls and attached buildings
In a strip center or a downtown block, the building you're taking down may share a wall with one that's staying. Separating them carefully, and protecting and weatherproofing the wall that's left, takes hand work and is priced that way.
Reading a quote
What a commercial demolition estimate should spell out
When two quotes are far apart, it's usually because they don't cover the same work. Check that each one lists:
Should be included or clearly excluded
- Permit, who pulls it, and who pays the fees
- Asbestos survey, notice and abatement, with the amount assumed
- Utility disconnects, sewer cap and fire line
- Removal of slab, footings and foundations, and to what depth
- Paving, curbs, light poles and site features
- Backfill, grading and the final condition of the site
Often left out, so ask
- Underground tanks or contaminated soil
- Asbestos found beyond what the survey showed
- Lane closures, police details or traffic control
- Utility company charges for removing their equipment
- Night or weekend work
Getting a real number
How to get a commercial quote you can plan around
Get the asbestos survey first
Without it, every contractor is guessing at the biggest unknown. With it, everyone prices the same abatement.
Share what you have
Building drawings, any environmental reports from a purchase or loan, and the site plan for what's being built next. Old drawings that show the foundations are especially useful.
Decide how the site should be left
Slab removed or left, footings out or cut below grade, paving gone or kept, rough graded or ready for a new pad. Write it down so every bid uses the same finish line.
Walk the site with each bidder
Access, neighbors, overhead lines and what's on the roof don't show up on a drawing.
Compare scope, then price
Line the quotes up item by item before you compare totals, and ask for a written allowance for anything nobody can see yet.
Related
Keep reading
Common questions
Frequently asked questions
How much does commercial demolition cost per square foot in South Florida?
There isn't a per-square-foot number that holds up for commercial buildings. The structure, asbestos abatement, below-grade removal, site access and paving can make one building cost several times another of the same size. A written estimate after a site visit and an asbestos survey is the only reliable number.
Do commercial buildings need an asbestos survey before demolition?
Yes. In Florida, commercial buildings need a thorough asbestos survey and a written demolition notice filed at least 10 working days before work starts, even if no asbestos is found. In Miami-Dade, Broward and Palm Beach counties the notice goes to the local asbestos program.
Why are commercial demolition quotes so far apart?
Usually because they don't cover the same work. One quote may include abatement, foundation removal and paving while another leaves them out. Compare the scope line by line, and make sure every bid assumes the same final condition for the site.
How long does it take to get a commercial demolition started?
The 10-working-day asbestos notice is the minimum, and abatement, utility disconnects and permit review often take longer. Starting the survey and the utility requests early is the best way to keep the schedule.
This article is general information. Asbestos, permit and environmental requirements vary by city and county and change over time. Confirm the current rules for your property with the building department and the county asbestos program.