Japanese Counters for Apartments and Rooms: 軒, 室, 階, 畳 and LDK

When you look for a flat in Japan, five counters carry the key facts: 軒 (ken) for houses, buildings and shops, 室 (shitsu) for rooms and 号室 (gōshitsu) for room numbers, 階 (kai) for floors, 畳 (jō) for room size in tatami mats, and the LDK letters for the layout. Three of them have sound changes that agents say fast: sangen, sangai and yojōhan.

What you need to know

Apartment hunting in Japan is full of numbers: how many places you have seen, which floor the flat is on, how big each room is and what the layout is called. Agents talk quickly and listings are dense, so recognising the counters saves time and avoids misunderstandings, such as thinking nikai is the second floor in the British sense when it is one floor up from the street. This guide follows a viewing day. It starts with 軒 for counting properties and nearby shops, moves to 階 for floors, then to 畳 and LDK for sizes and layouts, and ends with 室 and 号室 for rooms and room numbers. A full viewing dialogue shows how an agent and a tenant use these counters together, and the mistakes section covers the confusions that most often lead to a surprise on moving day.

軒 counts houses, buildings and shops: ikken, niken, sangen

階 counts floors: ikkai, nikai, sangai; the ground floor is ikkai

畳 measures rooms in tatami mats: rokujō, hachijō, yojōhan

室 counts rooms and 号室 is a room number; LDK names the layout

The numbers on a viewing day

An agent showing you a flat will tell you its size, its floor and how it compares with the other places you saw. These four lines are the core. Each uses a different counter, and each can change your decision.

Four picture cards: a six-mat room, a flat on the third floor, three properties viewed, and two vacant rooms.
Room size, floor, places viewed and vacancies: the numbers that decide a flat.
JapaneseRomajiMeaning
六畳の部屋です。Rokujō no heya desu.It's a six-mat room.
三階です。Sangai desu.It's on the third floor.
三軒見ました。Sangen mimashita.I've looked at three places.
空室が二室あります。Kūshitsu ga nishitsu arimasu.There are two vacant units.

軒: houses, buildings and the shops nearby

軒 (ken) counts houses, buildings and shops: ikken, niken, sangen, yonken, goken, rokken, nanaken, hakken or hachiken, kyūken, jukken. The question is nangen. It appears when you talk about how many places you have viewed and about the neighbourhood: how many convenience stores or supermarkets are nearby.

Ikken is also part of the word ikkendate, a detached house, and ikken ikken means one by one, door to door.

JapaneseRomajiMeaning
今日は何軒見られますか。Kyō wa nangen miraremasu ka.How many places can we see today?
近くにコンビニが二軒あります。Chikaku ni konbini ga niken arimasu.There are two convenience stores nearby.
一軒家に住みたいです。Ikkenya ni sumitai desu.I'd like to live in a house.
もう一軒見てもいいですか。Mō ikken mite mo ii desu ka.Could we see one more place?

階: floors, from the ground up

階 (kai) counts floors and has two sound changes to remember: three is sangai and the question is nangai. One, six, eight and ten take a small tsu: ikkai, rokkai, hakkai or hachikai, jukkai. In Japan, ikkai is the floor at street level, so nikai is one floor up. Basement floors use chika, underground: chika ikkai.

Many people have preferences about floors. Ground-floor flats can feel less private and less secure, so some tenants, especially people living alone, ask for nikai ijō, the second floor or above. Upper floors may cost more. Ask about an elevator, erebētā, if the building is tall.

JapaneseRomajiMeaning
お部屋は何階ですか。Oheya wa nangai desu ka.Which floor is the flat on?
二階以上がいいです。Nikai ijō ga ii desu.I'd prefer the second floor or above.
五階建ての三階です。Gokaidate no sangai desu.It's on the third floor of a five-storey building.
エレベーターはありますか。Erebētā wa arimasu ka.Is there an elevator?
ゴミ置き場は一階です。Gomi okiba wa ikkai desu.The rubbish area is on the ground floor.

畳 and LDK: size and layout

畳 (jō) measures a room in tatami mats, even when the floor is wood. Common sizes are yojōhan, four and a half mats, rokujō, six mats, and hachijō, eight mats. Mat sizes traditionally differ by region, and real estate listings generally use a standard size of at least about 1.6 square metres per mat, so a rokujō room is roughly ten square metres. Check the total area in square metres, heibei, written ㎡ on the listing.

The layout code tells you how many rooms there are besides the shared spaces. The number counts bedrooms or other rooms, and the letters show the shared areas. Read the number in Japanese except for two, which is often nī, and the letters with English letter names.

JapaneseRomajiMeaning
リビングは何畳ですか。Ribingu wa nanjō desu ka.How many mats is the living room?
八畳の洋室と六畳の和室です。Hachijō no yōshitsu to rokujō no washitsu desu.An eight-mat Western room and a six-mat tatami room.
四畳半はちょっと狭いですね。Yojōhan wa chotto semai desu ne.Four and a half mats is a bit small.
2LDKを探しています。Nī eru dī kē o sagashite imasu.I'm looking for a 2LDK.
CodeReadingMeaning
1Rwan rūmuone room with the kitchen inside it
1Kwan kēone room plus a separate kitchen
1DKwan dī kēone room plus a dining-kitchen
1LDKwan eru dī kēone room plus a living-dining-kitchen
2LDKnī eru dī kētwo rooms plus a living-dining-kitchen

室 and 号室: rooms and room numbers

室 (shitsu) counts rooms in a more formal way, and it is the counter for units in a building and rooms at a hotel: isshitsu, nishitsu, sanshitsu. You meet it in words like kūshitsu, vacant room, and manshitsu, fully booked. In daily speech about your own flat, people usually say heya ga futatsu, two rooms, instead.

号室 (gōshitsu) is a room number, the number you write on forms and deliveries: nihyaku san gōshitsu, room 203. The first digit usually tells you the floor.

JapaneseRomajiMeaning
このマンションは全部で二十室です。Kono manshon wa zenbu de nijusshitsu desu.This building has twenty units in total.
お部屋は二つあります。Oheya wa futatsu arimasu.There are two rooms.
何号室ですか。Nangōshitsu desu ka.What's the room number?
ホテルを二室予約しました。Hoteru o nishitsu yoyaku shimashita.I booked two hotel rooms.

Mini dialogue: viewing a flat

You are viewing your third flat of the day with an agent. The agent uses polite service Japanese; you use ordinary polite speech.

A bright empty flat with labels for a six-mat Western-style room, a corner room on the second floor and ten minutes' walk to the station.
Size, floor and distance: an agent's three favourite numbers at a viewing.
JapaneseRomajiMeaning
こちらが三軒目のお部屋です。Kochira ga sangenme no oheya desu.Agent: This is the third place today.
何階ですか。Nangai desu ka.You: Which floor is it?
二階の角部屋です。Nikai no kadobeya desu.Agent: A corner unit on the second floor.
寝室は何畳ですか。Shinshitsu wa nanjō desu ka.You: How many mats is the bedroom?
六畳です。リビングは十畳あります。Rokujō desu. Ribingu wa jūjō arimasu.Agent: Six mats. The living room is ten.
駅から何分ですか。Eki kara nanpun desu ka.You: How many minutes from the station?
徒歩十分です。Toho juppun desu.Agent: A ten-minute walk.
いいですね。もう一軒と比べてから決めます。Ii desu ne. Mō ikken to kurabete kara kimemasu.You: Nice. I'll decide after comparing it with one more.

The suffix me turns a count into an order: sangenme, the third place; nikaime, the second time. It is handy at viewings, where you will often compare places by number.

Rent, deposits and keys

Money at the rental agency is often counted in months of rent. A listing might say shikikin ikkagetsu, a deposit of one month's rent, and reikin nashi, no key money. The suffix bun, worth of, turns a length into an amount: yachin no nikagetsu bun, two months' rent. Which payments apply and how much they are vary by area, landlord and contract, so ask the agent to go through each one.

Contracts are counted in years with 年 (nen): ninen keiyaku, a two-year contract. Keys are long and thin, so they take 本, and the agent will often tell you how many keys you receive when you sign.

JapaneseRomajiMeaning
敷金一か月、礼金なしです。Shikikin ikkagetsu, reikin nashi desu.Deposit of one month's rent, no key money.
初期費用は家賃の何か月分ですか。Shoki hiyō wa yachin no nankagetsu bun desu ka.How many months' rent are the move-in costs?
二年契約です。Ninen keiyaku desu.It's a two-year contract.
鍵は二本お渡しします。Kagi wa nihon owatashi shimasu.Agent: We'll give you two keys.

Mistakes that surprise you on moving day

  • Reading nikai as the British second floor. In Japan, nikai is one floor above the street.
  • Saying sankai or sanken. They are sangai and sangen, and the questions are nangai and nangen.
  • Comparing rooms only by 畳. Mat sizes vary, so check the square metres as well.
  • Saying ni eru dī kē with a short ni. Many people stretch it to nī so it is not lost before the letters.
  • Using 室 for your own rooms in casual talk. Heya ga mittsu sounds more natural than sanshitsu.

Rehearse the viewing before you go

Paste a real listing into Mocchi and type /explain, or ask: read this listing with me and quiz me on the counters. Mocchi breaks down the floor, size and layout codes, and remembers the words you had to ask about so they come back in a later review.

Then practise the conversation in the View an Apartment mission in AI Sensei, where Hana-sensei plays the estate agent. Ask about the floor, the room sizes and the walk to the station, and ask Hana-sensei to slow down when the numbers come too fast.

Key points

A practical way to improve

Describe your current home in Japanese: which floor it is on, how many rooms, how big the main room is and what the layout is called. Then describe your ideal flat with the same counters, and turn each condition into a polite request to an agent, such as nikai ijō ga ii desu, I would prefer the second floor or above. For sound changes, practise sangen and sangai aloud until they come out without thinking. Mocchi, Unihongo's study assistant, can check your description, correct counters and explain listing words you do not know, and it keeps a note of the ones you miss for later reviews.

FAQ

Frequently asked questions

How do you count floors in Japanese?

Floors take 階 (kai): ikkai, nikai, sangai, yonkai, gokai, rokkai, nanakai, hachikai or hakkai, kyūkai, jukkai. Three is sangai and the question is nangai. Ikkai is the ground floor, the floor at street level, and basement floors are chika ikkai, chika nikai.

What does 畳 mean in a Japanese apartment listing?

畳 (jō) is the size of a room measured in tatami mats, even for Western-style rooms with no tatami. A rokujō room is six mats, often around ten square metres. Mat sizes traditionally vary by region, so treat the number as a guide and check the floor area in square metres too.

How do you say 1LDK and 2DK in Japanese?

The letters are read in English letter names and the number in Japanese: wan eru dī kē for 1LDK, nī dī kē for 2DK. L is a living room, D a dining area and K a kitchen, and the number is the count of other rooms.

Why is three houses sangen and not sanken?

Some counters change k to g after three, and 軒 is one of them, like 階, which becomes sangai. The question word follows the same change: nangen and nangai. It is a sound change you learn by ear rather than by rule.