Last King Construction crew at work in Toronto

Toronto's PremierWaterproofing &Underpinning

Family-owned. 10+ years. Licensed & Insured.

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TORONTO AND GTA · SCARBOROUGH · MISSISSAUGA · OAKVILLE · NORTH YORK · ETOBICOKE · VAUGHAN · RICHMOND HILL · MARKHAM ·

Years Experience

Projects

Licensed & Insured

0★

Star Rated

Comprehensive construction, residential and commercial

Basement Waterproofing

Interior and exterior systems that keep your foundation bone dry. We handle membranes, weeping tile, drainage, and sump pumps end to end.

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Built different. Built to last

Family-Owned & Operated

A team that answers the phone, not a call center.

Licensed, Insured & Permitted

WSIB covered, fully permitted work, every project.

Transparent Pricing

Written quotes with no surprise change orders.

Clean Jobsites, On Time

Daily cleanup, communicated timelines, real handoff.

Our work speaks for itself

Waterproofing & Underpinning

Toronto

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Waterproofing & Underpinning

East York

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Underpinning & Heated Floor

North York

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Interlocking Walkway

Etobicoke

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Interlocking & Pergola Patio

Vaughan

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Basement Waterproofing in Toronto

Water damage is one of the most costly problems Toronto homeowners face. Last King Construction provides interior and exterior basement waterproofing solutions that protect your foundation from moisture, leaks, and flooding. We use industry-leading membranes, drainage systems, and sump pump installations to keep your basement dry year-round. Serving Toronto, Scarborough, North York, Etobicoke, Mississauga, and the entire GTA.

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Basement waterproofing Toronto interior drainage installation

Basement Underpinning in Toronto

Need more headroom in your basement? Basement underpinning is the process of lowering your basement floor to increase ceiling height, often from 5 to 6 feet to a full 8 feet, creating livable, rentable space that adds real value to your home. Last King Construction has completed hundreds of underpinning projects across Toronto and the GTA, delivering safe, permitted, and structurally sound results every time.

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Basement underpinning Toronto concrete foundation work

What Toronto homeowners are saying

"Last King fully waterproofed our 1920s home from the exterior. Three winters in, the basement is still bone dry. Permits pulled, jobsite clean, crew on time every day."

Marcus T.

Leslieville, Toronto

"We underpinned our basement and went from a 5'8" ceiling to a full 8 feet. The new rental suite pays our mortgage. Worth every dollar, and the structural work passed inspection first try."

Priya S.

North York

"Got three quotes for waterproofing and a sump pump. Last King wasn't the cheapest, but their walkthrough was the most transparent. No surprise costs, real warranty in writing."

Jordan L.

Scarborough

Fully Licensed/WSIB Insured/Building Permit Ready/Google 5-Star Rated