Etobicoke holds a wider range of housing than anywhere else we work. There are streets near the lake where the houses predate the First World War, and there are towers going up on Lake Shore that will not be occupied until the 2030s.
Which of those you live in decides everything about what your house needs.
From an 1890 Factory Town to Towers on Lake Shore
New Toronto was planned in 1890 by a group of industrialists as a manufacturing subdivision. It covered one square mile and at its height carried the highest value of manufacturing per square mile in North America.
Long Branch started earlier still, as a gated upper class cottage resort in Victorian times, then got subdivided through the 1920s across the flats near the mouth of Etobicoke Creek. Mimico was its own municipality from 1917 until 1967, and small bungalows began appearing there through the 1920s.
The Kingsway came from the same decade. Robert Home Smith laid it out in the 1920s and 1930s as a planned garden suburb, curved streets rather than a grid, Tudor and Georgian houses, mature trees. He sold it as "a little bit of England far from England", and it still reads that way.
North of all that, the district turns postwar and looks much like the rest of suburban Toronto.
Houses Built Before Insulation Was a Consideration
A house finished in 1925 was not insulated in any sense we would recognise. Insulation as standard practice came decades later. Whatever is in your attic now was put there by somebody afterwards, often in stages, often by different people who did not coordinate.
That produces a few patterns worth knowing about.
Depth is usually uneven rather than uniformly thin, so averages mislead and the gaps do the damage. There are frequently two or three generations of material stacked on each other, and the oldest layer may be compacted to the point of doing very little. Roof structures are more varied than in postwar housing, with dormers, steep pitches and knee walls creating spaces that are awkward to reach and easy to miss.
Older houses also leak air in ways newer ones do not. Adding depth over an unsealed attic in a 1920s house is close to wasted money, which is why the sequence matters more here than the quantity does.
There is also the lake to account for. Mimico, New Toronto and Long Branch sit close enough to the water to get more wind exposure than inland streets, and wind drives air through gaps that would sit quietly in a sheltered location. Houses along the lakeshore often feel draughtier than their insulation depth alone would explain, and sealing tends to deliver more there than another few inches above the ceiling would.
The self check still works. Open the hatch, look across the floor, see whether the joists are standing proud of the insulation. Our guide to checking your own attic depth explains what you are looking at. In a pre-war house, expect it to be less even than the guide describes.
Knob and Tube in Kingsway and Mimico Attics
This is the one that catches people out, and it is common enough in pre-war Toronto housing to be worth raising before anyone books anything.
Knob and tube was the standard wiring method into the 1940s. Where it is still live in an attic, it cannot simply be buried. The system relies on open air around the conductors to carry heat away, so covering it with insulation is a genuine fire risk rather than a technicality.
If your house dates from before roughly 1950 and has not been fully rewired, there is a reasonable chance of finding some in the attic. That does not mean you cannot insulate. It means an electrician needs to be part of the conversation before the blower comes out, and any assessment worth having will check for it rather than discovering it halfway through the job.
Ask about it. A contractor who has no answer on knob and tube has not worked much in this part of the city.
North of Bloor Is a Different Job Entirely
Etobicoke north of Bloor is postwar and behaves like it. Detached and semi-detached houses from the 1950s through the 1970s across Richview, Willowridge, Rexdale and the surrounding areas, with accessible attics and straightforward roof structures.
Those are simpler jobs. Usually a removal where needed, sealing, and blown-in material to depth. The Ontario Building Code asks for R-60 in new construction across Climate Zone 6, roughly 22 inches of loose fill, and a 1962 house will be nowhere near it.
Existing houses are not required to meet current code, so nothing about that is a violation. It is simply a heating bill.