One floor plan can sabotage an apartment long before furniture arrives. A corridor that runs deep into the unit, with no windows and doors scattered along its length, consumes area that building codes still count as living space yet offers almost no functional zone for daily life.
The harsh tradeoff is simple. Volume stays. Life shrinks. Long dark hallways, chopped-up micro rooms and awkward structural bays turn circulation into a tax on every square meter, as circulation ratio and net-to-gross efficiency fall while the legal floor area on the deed remains unchanged.
Designers argue that many homes effectively lose twenty to thirty percent of their potential just to poor planning, because structural grids, plumbing shafts and egress rules are treated as constraints to dodge rather than tools to align, so kitchens, living areas and storage end up scattered like offcuts from a badly drawn plan.
The sharper view is that buyers obsess over price per square meter only because they rarely see a second metric on the sales sheet, one that would state usable floor plate, furniture layout capacity and daylight reach, and without that, a gloomy corridor can quietly erase the home they thought they were buying.
