Basement underpinning in Caledon
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. Caledon is estate lots and century farmhouses around Bolton, Caledon East and Inglewood, with new subdivisions at the south end, many on wells and septic systems. Those basements in Caledon were never meant to be lived under, and lowering the floor is what turns them into a suite or a real family room.
Caledon, on the ground.
Lots are large and access is easy, but the Escarpment, the Moraine and the Greenbelt each add an approval before the building permit. 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.
Read more about building in Caledon 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. The Town of Caledon issues the permit, and a rural lot brings septic design, well protection and the conservation authority's review into the schedule.
- 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 Town of Caledon 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.
The Town of Caledon. Lots on the Niagara Escarpment may also need the Escarpment Commission's permit, and those inside a conservation authority's area need its review first.
Yes. The tie-in between a new addition and an old stone or brick house is the engineering question, and the septic capacity often decides how many bedrooms the addition can have. Both come up at the site walk.