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How to Underpin a Basement

Underpinning a basement in Hamilton, Ontario


What is underpinning, and when is it required?


Underpinning is the process of strengthening and supporting the property's foundation. This can be done by extending the depth foundation.


Underpinning occurs when homeowners want to improve deficient/failing foundations, implement structural changes to the building for renovations, for example: adding more floors, or when new construction occurs nearby and requires the removal or excavation of soil.


There are various ways to conduct the process of unpinning. However, the most traditional method of underpinning is mass concrete. This method involves extending the old foundation and usually consists of excavating sections below the foundation, one at a time, and backfilling each concentre.





Key factors to consider when wanting to go through the process of underpinning:


  1. When hiring subcontractors, they should have an in-depth understanding of concrete; however, since you're paying for a specialized service, it may be more expensive.

  2. If you are doing an underpinning job, ensure this process is covered under your insurance just in case anything happens. Unpinning typically does not fall under home renovation insurance; you have to add it on.

  3. Get a structural engineer who has done engineering designs for unpinning projects. They can design and review your designs giving them the seal.

To watch a video and learn more about how to underpin a basement properly please click here.


It is important to note: Ontario Regulations for Residential Underpinning

  • You will be required to provide testing and reports by a professional engineer during the first and last stages of the construction in order to pass inspections.

  • The documentations required are a site plan, basement foundation plans for underpinning, floor plans, sections, and construction details and notes.




Before and after - Pal Property Solutions’ East 25th project in Hamilton, Ontario


Our East 25th project is a great example of underpinning a basement, as the house was converted into a legal triplex. Originally purchased as a single-family home. Renovation costs included all underpinning foundations, entirely new electrical, plumbing, structural, mechanical, and all interior finishes.


Below are the numbers for the project:

  • Purchase price: $300,000

  • Construction Costs and Holding Costs: $350,000

  • After repair value: $1,050,000

  • Money Split after partner was paid out (surplus): $190,000


Ready to get started? Don’t forget to download our Getting Your Foot in the Door book which covers the most frequently asked questions as well as lessons learned from our founder, Alex Pal.

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