Thanks SpadinaBus for that helpful advice. The floorplan is too vague to ascertain any definitive width dimension.
This may sound ridiculous, but I feel a major "fiasco" is imminent, or one should happen, to trigger the reboot of the pre-construction, floor plan sales practice. Similar to how airlines (or travel agency websites) are now required by law to quote prices including taxes (as there must have been questionable/misleading practices commonly used to trick buyers in the past), the same needs to happen with advertised floor plans. At the end of the day, the end user, the purchaser, wants to know how much LIVING SPACE they're getting. It should become mandatory to:
1. Post all room dimensions on the floor plan. If not on the actual drawing (i.e. in the bathroom), then at the side;
2. Outline total, actual, interior living space square footage (excluding exterior wall thickness) and separately list balcony/terrace size; and
3. List separately the total architectural square footage that will be included in the registered property, including concrete thickness, electrical box depth, plumbing cavity and whatever other bullshit void 99% of people don't give a crap about.
The onus should not be on the buyer to hire a surveyor to double check whether builders have exceeded the 2% variance in square footage. In this financial transaction, the onus and responsibility should lie on the builder to ensure they build within the 2%, as advertised. Having exact measurements hold builders more accountable, and help purchasers be more informed. How many people probably never check or know whether they've been considerably screwed?