1920–1939

    Canadian homes built 1920–1939

    This period spans a construction boom and then the Depression, so quality and specification vary widely even within a single street. National model codes still did not exist, and municipal by-laws differed substantially.

    Era association is not a finding. Everything on this page describes what was typical when these homes were built. It does not establish what any specific property contains today.

    What should you know about a Canadian home built 1920–1939?

    Homes built in Canada between 1920 and 1939 were typically wood-framed with masonry veneer or wood cladding, wired for limited electrical loads, and heated by coal-fired gravity systems later converted to oil or gas. Era association is not a finding. Any specific property's wiring, plumbing and heating today depend on later work that must be confirmed through records and inspection.

    Common at the time

    • Wood platform or balloon framing with brick veneer or wood siding
    • Poured or block concrete basements, often unwaterproofed
    • Knob-and-tube wiring giving way to early armoured cable in some markets
    • Galvanized steel water supply and cast iron drains
    • Coal-fired gravity furnaces with large masonry chimneys
    • Plaster interiors; sawdust, shavings or no insulation in wall cavities

    May have been altered since

    • Service upgrades from 30 A or 60 A to 100 A or more
    • Heating conversion from coal to oil to gas, with chimneys relined or abandoned
    • Buried or removed oil tanks from a later oil-heating phase
    • Basement finishing that conceals foundation, framing and wiring
    • Window and cladding replacement that changed how the wall dries

    Verify today

    • Electrical permit history and the age and rating of the current panel and service
    • Whether any oil tank was ever installed, and if so what removal or decommissioning documentation exists
    • Chimney and venting condition for the appliance actually installed today
    • Whether visible plumbing is representative or only the last section replaced
    • Suspected asbestos in duct wrap, boiler insulation or flooring before any disturbance

    Materials associated with this era

    • Brick veneer
    • Concrete block
    • Galvanized steel pipe
    • Cast iron
    • Plaster and lath

    Systems to research for this era

    Regional variability

    Ontario
    Large surviving stock of brick-veneer housing in pre-war streetcar suburbs; the Electrical Safety Authority holds inspection and permit records for later work.
    Quebec
    Plex housing forms are common; Régie du bâtiment du Québec rules govern current work rather than original construction.
    Prairies
    Depression-era construction can be lighter in specification; foundation movement questions are prominent.
    British Columbia
    Character-home policies in some municipalities affect what may be altered or removed.

    Requirements differ by province and territory. Check the provincial source directory before relying on any rule.

    Evidence note

    Sources
    Jurisdiction
    Canada (model code; adopted with amendments by each province/territory); Canada (federal); Canada (federal); Canada (federal)
    Applies to
    Canadian residential buildings constructed 1920–1939
    Last reviewed
    2026-08
    Limitations
    Construction practice varied by region, builder and budget, and later work is common. This page does not describe any specific property.
    What you should verify
    Municipal permit records, provincial safety-authority histories, service records, and assessment by qualified professionals.