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How to Level a Concrete Slab Floor: DIY & Pro Methods (2025)

Step-by-step guide to fix uneven concrete slabs in Toronto garages, basements, and warehouses. Self-leveling, grinding, and patching — with tools, costs, and local frost-heave tips.

Call (647) 284-6202

Why Level Your Concrete Slab Floor?

Uneven slabs cause cracks, water pooling, and coating failures. In Toronto, frost heave and soil settlement worsen dips over time.

  • •Prevents Epoxy Peeling: Flat surface = long-lasting garage floor epoxy.
  • •Stops Water Damage: Eliminates low spots where moisture collects.
  • •Safety & Code Compliance: Required for commercial and residential renos.

Learn more in our slab preparation guide.

How to Level Concrete Slab Floor: Full Process

  1. 1
    Assess the Slab: Use laser level across entire floor. Mark high/low spots.
  2. 2
    Grind High Spots: Use 7" diamond cup wheel. Dust control mandatory.
  3. 3
    Patch Deep Cracks: Fill with polymer-modified repair mortar.
  4. 4
    Prime & Pour Leveler: Apply bonding primer. Pour self-leveling compound in 25 sq ft sections.
  5. 5
    Final Grind & Seal: Light grind after 24 hrs. Seal with densifier.

For slabs over 1" out of level, consider mudjacking. See our advanced finishing options.

Tools & Materials Needed

  • •Tools: Laser level, concrete grinder, mixing paddle, spiked shoes, gauge rake
  • •Materials: Self-leveling underlayment (Ardex, Mapei), primer, crack filler
  • •Safety: HEPA vacuum, N95 mask, knee pads

Rent tools locally or use our DIY leveling kits.

Cost to Level Concrete Slab in Toronto (2025)

Per square foot (materials + labor):

  • • DIY (Materials Only): $1.80 – $3.50/sq ft
  • • Pro Self-Leveling: $5.00 – $9.00/sq ft
  • • Grinding + Leveling: $7.00 – $14.00/sq ft

Get exact pricing with our slab cost calculator.

Frequently Asked Questions

1

How thick can self-leveling compound be poured?

Up to 1.5" in one pour. Deeper requires gravel fill + topping.

2

Can I level a slab with epoxy on it?

Yes — grind off old coating first. We offer removal services.

3

Is slab leveling needed before polished concrete?

Absolutely. Uneven slabs ruin the polish. See our polishing guide.

Level Your Toronto Slab the Right Way

Ready for a perfectly flat base for basement epoxy, tiles, or polished concrete? We serve GTA-wide.

Call Now: (647) 284-6202

View our slab transformation gallery or check FAQs.