Japanese Apartment Layouts: 1R, 1K, 1DK, 1LDK

Japanese apartment codes describe how rooms are arranged. A 1R has a kitchen within the main room; a 1K separates the kitchen from that room. A 1DK adds a dining-kitchen area, while a 1LDK has one independent room plus a combined living-dining-kitchen area. The code alone does not tell you the apartment's floor area, bathroom arrangement, or permitted occupancy.

Key Takeaways

Read the number and letters together. In a 2LDK, two independent rooms sit alongside the living-dining-kitchen area.
Check m² separately. Two apartments with the same code can have different sizes and usable space.
Look at the actual floor plan. Doors, windows, storage, and appliance spaces affect how the home works.

Japanese Apartment Layouts at a Glance

Code	Independent rooms	Kitchen and shared space	A useful question at the viewing
1R	One main room, including kitchen	Cooking and living share one space	Can your bed stay away from cooking and the entrance?
1K	One room separate from kitchen	Separate kitchen area	Does the kitchen door leave enough space for appliances?
1DK	One room	Combined dining and kitchen area	Can a table fit without blocking movement?
1LDK	One room	Combined living, dining, and kitchen area	Can the main room serve as a bedroom while you work elsewhere?
2LDK	Two rooms	Combined living, dining, and kitchen area	Does each room fit its intended use?
3LDK	Three rooms	Combined living, dining, and kitchen area	Is there enough storage for your household?

MLIT's Apartment Search Guidebook, section E05, explains the independent-room count and the shared functions of DK and LDK. For 1R and 1K examples, see the real-estate association Zentaku's guide to renting in Japan.

The diagrams below are original illustrations, not property listings. They are not to scale. Bathroom, toilet, entrance, and fixture positions are examples rather than requirements of the code.

What Is a 1R Apartment?

1R means one room, with the kitchen inside the main living space. It is the closest of these labels to an open studio. A separate bathroom does not distinguish a 1R from a 1K; the kitchen separation does.

An open room may make furniture placement flexible, but cooking and sleeping happen in the same space. At a viewing, check the extractor, window placement, and distance between the cooking area and where you would put a bed.

What Is a 1K Apartment?

1K means one independent room plus a separate kitchen area. Check the plan for the partition or door between them. A kitchen in a narrow entrance corridor can work very differently from a wider kitchen with room to turn around.

Illustrative 1K: a partition and doorway separate one main room from the kitchen area.

Before choosing it over a 1R, measure the room you will actually live in. More separation does not automatically mean more floor area. Check the refrigerator space and whether an open door blocks cupboards or the washing machine.

What Is a 1DK Apartment?

1DK means one independent room plus a combined dining-kitchen area. It does not mean a bedroom, a separate dining room, and another separate living room.

Illustrative 1DK: one independent room connects through a doorway to a dining-kitchen area.

For someone who wants to keep meals out of the bedroom, this can be a useful arrangement. Sketch the table and chairs on the plan before assuming the dining area will double as a comfortable workspace.

What Is a 1LDK Apartment?

1LDK means one independent room plus a combined living-dining-kitchen area. The L, D, and K describe functions within that shared area, rather than three separate rooms.

Illustrative 1LDK: one independent room is separated from a combined living, dining, and kitchen area.

It may suit someone who wants separate sleeping and living spaces. For two people, discuss overlapping work calls, sleep schedules, storage, and whether the lease permits both occupants. The label cannot answer those questions.

What Do 2LDK, 3LDK, and SLDK Mean?

A 2LDK has two independent rooms in addition to the LDK; a 3LDK has three. Treat those rooms as spaces to inspect rather than guaranteed Western-style bedrooms. Dimensions, storage, doors, and access matter.

The S in 1SLDK or 2LDK+S refers to a service room, also called a nando. It should not be assumed to be an extra bedroom. Sumitomo Mitsui Trust Realty's service-room explanation describes how rooms that do not meet the relevant conditions for an ordinary habitable room may be advertised this way. Ask the agent about light, ventilation, and intended use.

How to Read Apartment Sizes in m² and Jō

The layout code and floor area are separate pieces of information. Read the apartment's advertised total m², then examine each room's shape and dimensions. Do not compare a single room's size with another apartment's total area.

A room may be labeled in jō, written 畳 or 帖, rather than m². This is a tatami-based area description; it does not mean the room necessarily has tatami flooring. Ask which measurement the listing uses and request dimensions for furniture. Avoid estimating the entire apartment from a bedroom's jō label.

We do not assign a universal size range to each code: the plan, total area, and current listing are more useful than treating a 1K or 1LDK as a fixed size.

Check the Features the Code Does Not Describe

Use this checklist when comparing plans:

Bath and toilet: inspect whether they are separate, combined, or otherwise arranged.
Appliances: measure the refrigerator and washing-machine spaces, connections, and access route.
Storage: check usable depth, doors, and whether a closet takes space from furniture placement.
Work and sleep: test the room layout against the hours each person will use it.
Windows and noise: visit rather than relying on a bright listing photograph.
Balcony or loft: ask about permitted use and practical access; neither is guaranteed by the code.

Compare Housing Cost After Comparing Layouts

Make a shortlist at the same station distance, building age, and total area. Then compare the monthly amount and itemized move-in charges. A smaller floor plan is not enough information to call a property better value.

For the location decision, use our Japanese suburbs guide and Tokyo suburbs and neighborhoods comparison. Put the initial payment into the arrival cash worksheet, then add viewings and lease tasks to your moving checklist.

Frequently Asked Questions

Is a 1R the same as a studio?

It is a useful English comparison because the kitchen shares the main room. Inspect the actual plan rather than assuming every property advertised as a studio has the same arrangement.

Is a 1LDK always bigger than a 1DK?

Do not use the code as a substitute for total m². Compare the advertised areas, room dimensions, and furniture layout of the actual properties.

Can a couple rent a 1K?

Check the landlord's occupancy conditions before applying. The layout code does not grant permission for a second occupant or tell you whether the space will suit two people.

Last updated October 29, 2026. Definitions checked against the linked MLIT, Zentaku, and real-estate terminology sources. This guide supports housing research; the actual listing and lease terms control.