In a Toronto condo listing, "1+1" means a one-bedroom unit plus a den. The first number counts the bedrooms. The "+1" is the den, a second enclosed or semi-enclosed room that is not a legal bedroom. A "2+1" follows the same pattern, meaning two bedrooms and one den.
The den gets its own number because it does not qualify as a bedroom under Ontario rules. The Ontario Building Code sets requirements for a bedroom, including a minimum window area for natural light equal to roughly 5 percent of the room's floor space. Nowhere does the code define a den. That gap is the whole story. Because no rule says what a den has to be, almost any extra space can be labelled one.
In practice that produces a wide range. Some dens are proper rooms with a door and a window, big enough for a real home office or a nursery. Others are a windowless alcove off the living room, or a nook barely wide enough for a desk. Two units both listed as 1+1 can feel completely different once you walk in, which is why buyers regularly tour a "one bedroom plus den" and then struggle to find the den at all.
The distinction matters for money, not just layout. A den usually adds usable square footage, and that can push up both the price and the monthly maintenance fee, since fees are often tied to unit size. It rarely carries the value of a true second bedroom, and a windowless den cannot be resold as one. If you are weighing a 1+1 against a smaller floor plan, it helps to understand the difference between a studio and a junior one-bedroom condo, and how a den changes the math on Toronto condo maintenance fees.
The takeaway is to judge the den by the space itself, not the label. Measure it. Check whether it has a window and a door. Then picture how you would actually use the room before assuming the second number adds a full bedroom's worth of value.
Related reading: What Is the Difference Between a Studio and a Junior One-Bedroom Condo in Toronto?, Condo Maintenance Fees in Toronto: What They Cover, and How Much Does It Cost to Buy a Condo in Toronto?
