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Japanese Apartment Floor Plan Notation: 1K, 1DK, 1LDK Explained

Floor plan notation is everywhere in Japanese rental listings. Knowing what the letters mean makes apartment hunting much smoother.

R (One Room)

A layout with no partition between the kitchen and living space — everything in one room. Often the room opens up immediately past the entrance.

K (Kitchen)

A layout with a partition (like a door) between the living space and kitchen, where the kitchen area is generally understood to be under about 4.5 tatami mats (roughly 7.4 m²) in size.

DK (Dining Kitchen)

A kitchen large enough to eat in, generally referring to a space of roughly 4.5–8 tatami mats (about 7.4–13 m²). Think of it as a step up in size from a "K."

LDK (Living Dining Kitchen)

The largest kitchen category, which also doubles as a living/relaxing space — generally understood to be 8 tatami mats (about 13 m²) or larger.

The number indicates how many separate rooms

The "1" in "1LDK" means there is one separate room in addition to the LDK. A higher number means more individual rooms beyond the LDK space.

What the "S" (service room) means

The "S" in listings like "1SLDK" typically refers to a storage-like space that doesn't meet the lighting or size standards to be officially classified as a proper "room."

Why the standards can feel a bit fuzzy

The K/DK/LDK size categories are set by a fair-competition standard within the real estate industry, but actual usability also depends on the room's shape and window placement. Rather than judging purely by the notation, it's important to check the actual floor plan or view the unit in person when possible.

The difference between a studio (R) and a 1K

Both are geared toward single occupants, but a studio has the kitchen and living space in one room, while a 1K has a partition between the kitchen and the living space. That partition can make a 1K more practical for containing cooking smells or when guests visit.

Frequently Asked Questions

Why do two units with the same "1LDK" label feel so different?

Even with identical floor-plan notation, actual usability can vary a lot based on the LDK's shape (elongated vs. closer to square), the room's position, and how much storage there is. Treat the notation as a rough guide and confirm the actual floor plan or view the unit in person.

Which floor plan is best for living alone?

For someone who doesn't cook much, a studio or 1K is often plenty; for someone who cooks often or has frequent guests, a 1DK or 1LDK may feel more comfortable. Choose based on your lifestyle.