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Turn Low Ceilings Into Legal Living Space
If your basement is 6–7 ft high — it’s not legal living space.
In high-demand markets like Toronto, Mississauga and across the GTA — you’re sitting on unused equity.
Basement lowering (underpinning) allows you to:
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Increase ceiling height to 8–9 ft
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Create legal rental apartment
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Strengthen old foundation
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Install full waterproofing system
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Increase home value significantly
At Kome Waterproofing & Underpinning Inc, we specialize in structural basement lowering built to Ontario Building Code standards.
Why Basement Lowering Is a Smart Investment in GTA
Real estate prices in the GTA continue to rise.
Creating a legal secondary suite can:
• Add $150,000–$300,000+ in property value
• Generate rental income
• Improve resale appeal
• Solve structural and moisture issues at the same time
Especially in older neighborhoods like Etobicoke, Scarborough and Toronto — underpinning is often the only way to modernize basements properly.
Our Basement Lowering Process (Step-by-Step)
1 Engineering & Permits
4 Reinforced Concrete Footings
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We work with licensed structural engineers and handle all permits.
2 Sectional Underpinning (Pin System)
5 New Concrete Slab
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Foundation is lowered in controlled structural sections to ensure stability.
• Gravel base
• Vapor barrier
• Reinforced slab
• Smooth level finish
3 Excavation & Drain Upgrade
6 Integrated Waterproofing
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We remove soil safely and install new drainage systems.
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We install weeping tile systems and sump pumps to prevent future flooding.
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High-strength concrete + rebar reinforcement for long-term structural support.
Why Choose Kome Waterproofing & Underpinning Inc?
Many companies excavate.
Few truly specialize in structural underpinning.
We focus on:
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Structural precision
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Clean job sites
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Detailed planning
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Transparent pricing
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No shortcuts
Your foundation is the most important part of your home.
We treat it that way.
Every project is different, but typical ranges:
• 600–800 sq ft: starting $65,000+
• 800–1,200 sq ft: $75,000–$110,000
• Larger basements: custom quote
Basement Lowering Cost in Toronto & GTA
We provide detailed written estimates with full scope breakdown.
Cost depends on:
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Required depth
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Soil conditions
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Plumbing relocation
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Waterproofing system
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Property access
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Required depth
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Soil conditions
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Plumbing relocation
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Waterproofing system
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Property access
Areas We Serve
We provide basement lowering across:
• Toronto
• North York
• Scarborough
• Etobicoke
• Vaughan
• Markham
• Richmond Hill
• Mississauga
We serve most locations across the GTA.
Frequently Asked Questions
Q : How long does basement lowering take?
A : Usually 6–10 weeks depending on size and engineering requirements.
Q : Is basement lowering safe?
A : Yes — when engineered properly and inspected.
Q : Can I live in the house during construction?
A : In many cases yes. We stage the project carefully.
Q : Do I need permits?
A : Yes — and we handle everything.
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