Most people picture demolition as an excavator and a wrecking ball. On real GTA jobs, more than half the actual structural work happens before the excavator ever shows up, and most of it involves precision concrete cutting. If you are planning a interior demolition or a partial structural removal in Toronto, Mississauga, or Vaughan, the cutting plan is what determines whether the job takes three days or three weeks. Here is how concrete cutting and core drilling actually work on a 2026 GTA demolition project, and why getting it right matters more than people think.
Why concrete cutting matters in modern demolition
Precision cutting lets a crew remove a single wall, open a doorway, drop a slab, or take out a beam without disturbing the rest of the structure. On a downtown Toronto retrofit, that means tenants on the floor above keep working. On a residential basement underpinning job, it means the house above stays standing while the slab gets opened in clean rectangular sections. The alternative, which is jackhammering everything by hand, is slower, dustier, louder, and far more likely to crack adjacent concrete.
The four cutting methods used on GTA jobs
Wall sawing
A track-mounted diamond blade rides on a rail bolted to the wall. Operators use it to cut window and door openings into concrete walls, drop sections of foundation, or open elevator shafts. Wall saws cut up to about 30 inches deep with a 60-inch blade. They are the standard for vertical concrete in commercial and residential basements.
Slab sawing (flat sawing)
A walk-behind diamond saw cuts horizontal concrete: floors, driveways, parking decks, sidewalks, and structural slabs. Slab saws cut up to about 24 inches deep on a single pass. On a downtown Toronto parking garage retrofit, a slab saw is what cuts the openings for new mechanical chases and stair extensions.
Core drilling
A hollow diamond bit rotates to drill a clean round hole through concrete or masonry, ranging from a half-inch to 36 inches in diameter. Core drilling is how plumbers, electricians, and HVAC contractors get pipe sleeves through structural slabs and foundation walls without weakening the surrounding concrete. On most demolition projects, core drilling happens during the rough-in phase right after structural cuts.
Wire sawing
A diamond-impregnated cable wraps around the cut and is pulled through under tension. Wire saws can cut through massive concrete sections that no blade can reach, including heavily reinforced bridge piers and thick foundation walls. On the GTA we use wire sawing mostly on commercial projects with thick reinforced concrete or for cutting out large precast panels.
Dust and water control on Toronto sites
Every cutting method except hand chipping is wet by default. Water cools the diamond blade, suspends silica dust, and dramatically reduces the airborne hazard for the operator and anyone nearby. On occupied buildings, that water has to go somewhere. A typical commercial cut produces 5 to 20 gallons of slurry per linear foot. Crews catch slurry with vacuum dams, route it to filter bags, and dispose of the residue per the Ontario Ministry of Labour construction safety guidance on construction silica.
For residential interior cuts where wet methods are not practical, modern cutting saws come with HEPA-vacuum dust collection that captures up to 99.97 percent of airborne silica. We default to wet cutting on every job and use HEPA-dust setups only when wet is genuinely impossible.
What a typical cutting plan looks like
Before the cutting crew shows up, the project manager and the structural engineer map every cut on a marked-up drawing. The plan answers three questions:
- Where does each cut go, exactly? Measured to the inch, marked on both faces of the wall or slab.
- What is hidden inside the concrete? Rebar, post-tension cables, electrical conduit, water lines. We use ground-penetrating radar (GPR) on every commercial cut to map embedded steel and live services before the blade goes in.
- What holds the structure up after the cut? Temporary shoring, needle beams, and load transfers, all stamped by an engineer for any cut that affects load-bearing concrete.
Cost factors for GTA concrete cutting in 2026
Pricing depends on five things: depth of cut, type of concrete (plain vs reinforced vs post-tensioned), access difficulty, dust control requirements, and disposal of the cut material. Rough 2026 GTA pricing for reference, not for quoting:
- Wall sawing: $40 to $90 per linear inch of depth, per linear foot of cut
- Slab sawing: $7 to $15 per linear foot for 4 inch depth
- Core drilling: $50 to $250 per hole depending on diameter and depth
- Wire sawing: project-quoted, typically the most expensive method
Reinforced concrete adds 30 to 60 percent. Post-tension slabs require pre-cut tendon scanning and add another premium. Tight access (interior with no driveway approach) adds 15 to 25 percent for hand-carried equipment.
Safety and certifications
Concrete cutting is regulated under Ontario Regulation 213/91 (Construction Projects) for noise, silica, water management, and overhead protection. Reputable cutting crews carry certifications from the Concrete Sawing & Drilling Association, plus internal training on GPR scanning, confined space, and silica exposure controls. Any commercial GTA project should require proof of these on the safety package before mobilization.
When to call a specialized cutting subcontractor
Most full-service demolition contractors carry their own cutting crews for residential and small commercial work. For projects involving post-tension slabs, heavily reinforced commercial concrete, occupied buildings with strict noise windows, or complex underpinning, even experienced demolition crews bring in a dedicated cutting specialist. The cost premium is small compared to a botched cut on a load-bearing element.
Frequently asked questions
How loud is concrete cutting?
A wall saw produces 95 to 105 dB at the operator. With proper PPE and a cutting blanket, perimeter noise drops below 80 dB at 25 feet. For residential GTA jobs, we schedule cuts within municipal noise bylaw windows (usually 7 a.m. to 7 p.m. weekdays).
Will cutting damage the rest of the wall or slab?
No. Diamond blades cut clean and do not transmit shock through the concrete. That is the entire reason precision cutting exists. Hand-jackhammering an opening, by contrast, can crack adjacent concrete several feet beyond the intended removal.
Do I need a permit just for concrete cutting?
Cutting itself does not require a permit. The work that the cutting enables (removing a load-bearing wall, modifying a foundation, opening a slab over occupied space) usually does. Building permits get pulled for the structural change, not the cut.
Can you cut concrete in winter on a Toronto site?
Yes. Wet cutting works year-round if you manage water freezing on the slab and protect slurry from puddling. Most GTA cutting crews work through Toronto winters with heated water and quick squeegee crews behind the saw.
How long does a typical residential cut take?
A doorway-sized opening in a 10 inch poured foundation wall takes about 4 to 6 hours from setup to cleanup. A full basement slab opening for an underpin pit takes a single day per pit. Commercial cuts are quoted by linear foot and crew shift.
Get a precision cutting plan for your GTA demolition project
If your project involves opening a foundation, removing a structural wall, dropping a slab, or coring through a concrete deck, the cutting plan should be in place before the demolition crew starts work. Almar Demolition handles cutting in-house on residential and small commercial GTA projects, and we coordinate specialty cutting subs on the bigger ones. request a free quote and we will walk through the cutting scope with you before you commit to a contractor.
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