Basement Underpinning (basement lowering)

New!...   One-Stop Architectural Services
Drawings...Structural Engineering...Permit Applications...Layouts...
3D Renderings... and more!

Up to $1500 Rebate if renovations are later purchased through the Renovation Co-op
For information call
416-367-8370 or Click Here

Basement Lowering
(Underpinning)

The following information is provided by:

The Aston Whitehall 
Renovation Co-op 

What you need to know...

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In recent years throughout the Toronto GTA, 
Basement Lowering, or Underpinning has 
become an increasingly popular renovation
project due to the many older, existing homes
that contain low overhead height in the basement.

By extending this height through the downward extension of the foundation walls, extra space is 
made available for a home office, personal use or additional income with the construction 
of a Basement Apartment.

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However, this is highly specialized work, and you should exercise caution when hiring a
contractor. The majority of general contractors are inexperienced in this type of structural 
modification, given the fact that Basement Lowering (underpinning) has only recently become
a more recognized and viable method of adding much needed living space to an older home.

Here are the main things to consider:

stamped drawings

Stamped Drawings:
To obtain a permit, you must have a completed set of architectural drawings that have been officially stamped by an approved Structural Engineer. This provides evidence that your home has been examined by an accredited authority with regards to how certain structural modifications (such as underpinning) may affect the load/weight balance of your home.

The Renovation Co-op now offers a separate, one-stop Architectural Planning &
Design Service
that includes the following:

* Architectural Design
* Interior Design
* Professional Measuring
* Floor Plans
* Landscape Design

* Structural Engineering
* Permit Applications
* 3D Architectural Renderings
* 3D Interior Renderings
* Home Staging

for details, go to: www.WeRenovate.com/Planning.htm

Package Pricing for Multiple Services

The main advantage in purchasing your own separate drawings is that you will own the drawings, which gives you the freedom to obtain more than one precise estimate. 
(For structural modification work including Basement Underpinning, “guesstimating” the 
cost can become highly inaccurate without a proper structural engineering report.)

Note: If you purchase your stamped drawings through The Renovation Co-op, and you 
wind up hiring an approved Co-op member to perform the work, you will receive an architectural drawing credit of up to
$1,500.

Obtaining the Permit:

FYI: Homeowners are always responsible for obtaining permits. However, a contractor or structural engineer may act as your representative and apply for the permit on your behalf.

If you do not use our Permit Application Service as part of your purchase for the drawings, we recommend that the contractor whom you ultimately select to perform the work applies for the permit.

Here are the reasons:


1. The inspector at the permit desk is likely to ask the person who is applying for the permit several technical questions about the work that is being applied for. The contractor that you finally select to perform the work will likely have the most familiarity with your project, and should be able to answer all questions on the spot, without having to make multiple visits back and forth to the permit office. 

2- In addition, most seasoned contractors know the importance of relationship building between themselves and the inspector desk at the permit office. When an inspector encounters an “unfamiliar face”, he or she may “over-scrutinize” someone that they have not seen before. It may be unfair to some of the newer, less-experienced general contractors, but it is the reality of that process.

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Selecting a Contractor...

With so many contractors and sub-trades claiming to be "experts" in the underpinning of basements, many homeowners get confused, intimidated, and downright scared due to inconsistencies in the information they are receiving about basement underpinning and other structural work. 

As The Renovation Co-op acts primarily as a facilitator and administrative support team for its contractor-members, our goal is to build more standardization and professionalism into the industry, not to criticize or point fingers at outside contractors

In fact, as a working model for the entire country, we prefer to build long-lasting relationships with as many quality-minded, professional contractors as possible.