Duplex/multi-unit shared systems before renovation

Identify water, drainage, heating, ventilation, structure, fire separation, meters and shutoffs serving more than one dwelling before isolating a project.

VERT / GREEN

Map what is truly private and shared before service shutdown or demolition.

JAUNE / YELLOW

A valve, drain stack, boiler or duct may serve multiple dwellings even if work looks local.

ROUGE / RED

Changing a common system, fire separation or structure without coordination: stop and obtain approvals/professionals.

Interactive triage

Helps choose the next step; does not replace design, permits or professional diagnosis.

Shared main shutoff
Plan notice, access and controlled restoration. Shared heating/ventilation
Check balancing, responsibilities and impacts on other units. Fire/sound separation opened
Restore fire/sound continuity to the applicable assembly. Current system map
Keep shutoffs, meters and responsibilities in the record.

Useful tools and data

Riser/service map
Shutoffs/meters
Separation assemblies

What the professional checks

Identify responsibilities
Coordinate shutdowns/balancing
Verify fire/sound separations

Official sources

Checked 2026-08-22.

V14

Systems to check before closing the work

V14 connects envelope, air, fire, structure, water and code instead of treating each project in isolation.

Renovation dependenciesRenovating while living at homeCode versions

V15

Remaining system checks not to miss

V15 covers issues that can block a project, cause a loss or become expensive once concealed.

Before closing wallsRenovating a rented unitPost-renovation commissioningCodes + climate by province

V26

Often-overlooked service interfaces

V26 connects systems that cross utility, plumbing, HVAC, envelope and metering boundaries.

Electricity submetering in multi-unit buildings

V28

Finish and service details to verify

V28 connects small details that become costly once finishes are closed.

Post-renovation cleaning and indoor air

V30

Shared, access and specialized interfaces

V30 connects projects where multiple systems, owners or rules meet.

EV charging in condos and multi-unit housing