Basement underpinning in York (Toronto)
Lots leave no room to go sideways, so the work goes up, down or inside, and deliveries come from the street. The work is in the basement and the house stays supported throughout, so most families stay; each section is dug, formed, poured and inspected before the next. Underpinning lowers a basement floor by extending the foundation walls down in short engineered sections, one at a time, so the house is never sitting on an unsupported wall. The result is legal ceiling height for a suite or a family room.
York (Toronto), on the ground.
York is 1910s to 1940s brick semis and small detached houses on narrow lots in Weston, Mount Dennis, Oakwood and Fairbank, many on block or rubble foundations. Those basements in York were never meant to be lived under, and lowering the floor is what turns them into a suite or a real family room. In York the brief is usually a second storey, a lowered basement for a legal suite, or a whole-home renovation that turns four small rooms into one plan.
Read more about building in York (Toronto) or the full basement underpinning page.
On the drawing.
A site walk with measurements of the existing ceiling height and a look at the footings
Engineered drawings with the underpinning sequence and the new footing depth
Building permit filed and followed by us
Excavation and pours in numbered sections, each inspected before the next
New slab, drainage, sump and waterproofing where the drawings call for them
A deficiency walk, and a written warranty
Paper first.
Underpinning needs a building permit with engineered drawings, and each section is inspected before the next one is dug; a suite that follows needs its own permit. Toronto Building issues the permit, and older foundations here mean the site walk includes a test pit before a second floor is drawn.
- A building permit with engineered drawings is required in every GTA municipality.
- Each underpinning section is inspected before the next one is dug.
- On a semi, the drawings address the shared wall and the neighbour's foundation.
- A suite that follows needs its own permit for the plumbing, the egress and the fire separation.
The paperwork wall: WSIB, insurance, licences, the HCRA status and the warranty, on one page and dated.
| Driver | What we look at |
|---|---|
| How far the floor drops | Every extra inch of depth is more excavation and a deeper footing. |
| Perimeter length | The number of underpinning sections is set by the wall length, and each one is dug, formed and poured on its own. |
| Soil and water | Clay, sand and a high water table each change the sequence and the drainage. |
| Benching instead | Where the soil or the neighbour's foundation rules out underpinning, benching lowers the floor with a ledge along the wall. |
| What follows | A lowered basement is usually the start of a suite, and the plumbing and finishes come after the slab. |
No price per linear foot on this site. The site walk and the engineer's drawings set the number.
Usually. The site walk measures the ceiling height and checks the footings, and the engineer draws the sequence. the City of Toronto (Toronto Building) issues the permit and inspects each section.
Usually, yes. The house is supported throughout and the work stays in the basement. Noise and dust are real, and the basement is out of use for the duration.
It depends on the foundation. Many houses in Weston and Oakwood sit on block or rubble foundations that need new footings or a steel frame to carry another floor. The engineer decides from a test pit, and we open one before the drawings so the answer is in the price.
The City of Toronto, through Toronto Building. The former borough has had no separate office since 1998.