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Basement Lowering

& Foundation Waterproofing


Waterproofing & Structural Repairs

Our expert team will transform your unusable damp basement into a dry & cozy living space.

Our basement remediation services include exterior excavation and waterproofing, interior water control systems, weeping tile & sump pit installations, epoxy & polyurethane injections, structural concrete re-enforcement with carbon fiber, basement lowering, underpinning and bench-pinning.


All underpinning work is performed by our experts and overseen by geotechnical and structural engineers, as well as City inspectors. A typical underpinning project can span 4-6 weeks and cost between $35,000-$60,000 which includes engineering, permits, underpinning, sub-floor drainage system, interior waterproofing and slab. Ready to be finished - anything from storage to a legal secondary dwelling unit.

Another option to lower the basement floors without underpinning is "bench-pinning". Bench-pinning is less expensive than underpinning because it requires minimal structural work. Instead of extending the foundation under the footing, a "curb" is along the existing creating a ledge along the perimeter of the exterior walls. The width of the curb will be similar size as the new depth. If your lowering the floor by 12", the new curb will be 12" wide. This method will reduces the usable finished space, therefore not always the best for smaller basements.

The Benefits of Underpinning & Lowering Your Basement Floor

  • Provides extra living space and adds value to your home

  • Add a legal secondary dwelling that generates extra income

  • Improves the living conditions of your house by providing better air flow and air quality with reduced dampness in the basement

  • Fortifies your existing foundation and creates a water control system that will keep your basement dry

  • Improves ground water drainage

  • Eliminate seepage of radon gas

  • 15-Year Transferable Warranty on all structural work



Blueprint offers multiple solutions when it comes to wet basements. The most common being multi-membrane exterior repair. All excavation is performed with high pressure water and vacuum using hydrovac equipment. This method significantly reduces damage to yours and your neighbors property and it's safer when digging around underground utilities. All native soil is then disposed and replaced with clean fill that provides proper drainage and reduces settlement. Typically a mix of 3/4" clear stone, sand and/or top soil.



If excavating the foundation from the exterior is not possible or too costly due to obstacles, there are other options available to properly seal your foundation.

An air gap membrane can be installed from the interior which connects to a new weeping system installed around the perimeter of the footing. All done from the interior. If your home has an older block or a stone foundation, you may require some repointing prior to installing the membrane.


Blueprint will make your basement feel dry, clean and protected – in addition, you can feel secure with an industry leading warranty as a pledge of our workmanship.

Consultations are free, help us understand your project!