Lowering a basement: underpinning, bench footing and elevations
Before gaining headroom, coordinate foundations, temporary sequencing, sewer elevation, groundwater, radon and the new slab.
Decision triage
VERT / GREEN · JAUNE / YELLOW · ROUGE / RED
What the professional checks
The professional checks footings, soil, loads, underpinning/bench sequence, temporary stability, sewer, groundwater, drainage, radon and the new slab.
Official sources
- SCHL — problèmes structurels avant rénovation de sous-sol
- SCHL — fondations et sous-œuvre d’une maison existante
Sources checked: 2026-08-24
Manage the project through closeout
V14
Systems to check before closing the work
V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.
V17
Specialized systems to cross-check
V17 completes gas, soil, water, fire, climate and structural interfaces.
V18
Specialized diagnostics to verify
V18 connects systems that become costly or regulated when a primary project triggers them.
V19
Edge systems to integrate into the project
V19 covers interfaces that become important when multiple home systems interact.
V29
Household safety and compliance details
V29 connects smaller risks that often fall between finishes, appliances, plumbing and local code.
V33
Invisible constraints before work
V33 checks electrical, legal, environmental and climate constraints that can block a project before demolition starts.
V47
V47 interfaces not to miss
These details are small on a drawing but can control water, structure or durability.