The Problem

The homeowners of this North York property wanted to convert their basement into a legal rental suite. However, they faced a common obstacle in this neighborhood: the original basement ceiling height was barely 6 feet. This “crawlspace” feel made the area dark, cramped, and legally non-compliant for a separate dwelling unit. To maximize the property’s value and rental potential, they needed significant vertical expansion without altering the home’s exterior.

Our Professional Assessment

Our structural inspection revealed that the existing footings were shallow, which is typical for homes of this era in North York. Simply digging out the floor wasn’t an option, as it would compromise the foundation’s stability. To safely gain the desired headroom, we combined a sequential dig-down process with basement underpinning, extending and reinforcing the footings to ensure the home remained fully supported during and after construction.

This approach allowed us to safely lower the floor while preparing the basement for modern waterproofing and finishing.

The Solution We Recommended

We proposed a comprehensive structural plan to lower the basement floor and increase ceiling height:

  • Sequential Excavation & Shoring: Dug soil beneath the existing walls in sections while installing temporary supports to hold the house load safely.
  • Foundation Extension (Underpinning): Poured new reinforced concrete footings to extend and strengthen the foundation.
  • Water Management: Installed a new interior waterproofing system, including weeping tile and a sump pump, to handle the additional depth.
  • New Slab: Poured a fresh, level concrete floor with rough-ins for future plumbing and electrical work for the suite.

By combining basement underpinning with careful excavation and waterproofing, we ensured the home remained stable and secure throughout the process.

The Results

  • Height Achieved: Transformed a 6-foot cellar into a spacious area with 8-foot ceilings.
  • Legal Compliance: The basement now meets the height requirements for a legal secondary suite.
  • Dry & Stable: The home sits on a reinforced foundation with a brand-new waterproofing envelope.
  • Value Added: Created entirely new livable square footage within the existing footprint.

The homeowners now enjoy a bright, comfortable, and fully legal basement suite –  all without compromising the home’s structural integrity.

Need more headroom in your North York home? Contact us today to discuss our basement underpinning and lowering services for deepening and reinforcing your foundation!

Watch The Project Video