1K vs 1LDK in Tokyo: where the gap is real, by ward

A Suginami studio rents for ¥85,000 a month. A Suginami one-bedroom rents for ¥158,000. The gap is ¥73,000, which looks like a lot of money for one extra room. Divide each rent by the floor area and the price per square metre comes out to ¥3,917 and ¥3,911. The two numbers match within six yen.

The math says the extra room is not what costs the extra ¥73,000. The bigger floor area and a newer building account for almost the entire gap. You are buying more square metres at the same rate the ward already charges per metre.

That trick works in some wards and breaks in others. This ranking sorts 13 central Tokyo wards by what the studio-vs-one-bedroom gap is actually paying for.

Criteria, in priority order:

• Median asking rent on each layout (long-term unfurnished, on listings active right now)
• Median floor area for each layout
• Median building age for each layout
• Whether the price per square metre matches between the two layouts (the test that diagnoses the gap)

A note on the numbers. Furnished mid-term operators charge more than these medians. Long-term unfurnished rent sits at the bottom of the range. Treat the numbers here as a floor, not as a forecast of what you will actually pay a furnished operator.

---

Why the test works

A midterm couple landing in Tokyo on day three of housing search hits the same scene every time. A long list of one-bedrooms at one price. A long list of studios at a lower one. The spread looks like the layout is what is expensive. It is not always.

Three things stack inside any "studio vs one-bedroom" comparison.

When you compare a studio and a one-bedroom in the same ward, three things drive the price difference:

• More floor area (a one-bedroom is typically 15 to 20 more square metres)
• A newer building (one-bedroom stock tends to be younger)
• The layout itself (a separate bedroom is worth real money in some markets)

Dividing rent by floor area takes the first one out of the comparison. If both layouts cost the same per square metre, you are paying for more metres, not for a separate bedroom. If the one-bedroom costs more per square metre, then the layout is genuinely expensive.

The trick is that building age usually tracks layout in Tokyo. Newer buildings tend to be one-bedrooms because young families and dual-income couples drive new construction. Older buildings tend to be studios because the post-war housing stock was mostly small. So when the per-square-metre numbers match, you are paying for new construction at the same metre rate.

The wards split into four groups by how this test behaves.

---

Group 1: gap dissolves on the per-square-metre test

In these wards, the studio and one-bedroom prices per square metre come out roughly equal. The headline gap is buying floor area plus a newer building, not the extra room.

Suginami. Studios median ¥85,000 at 21.7m² (¥3,917 per m²). One-bedrooms median ¥158,000 at 40.4m² (¥3,911 per m²). The two numbers match within six yen. The ¥73,000 gap is paying for 18.7 more square metres at the ward rate, plus a 12-year drop in median building age (21 years for studios, 9 for one-bedrooms). For a couple on a 60-to-90-day stay, the one-bedroom is the right pick if the budget can stretch.

The exception in Suginami. If rent is what is tight, target 25-plus-year-old studios at ¥68,000 for around 20m². You give up appliance condition and probably window seal quality. Window seal quality matters for the August humidity stretch and the January cold-test. Livable for 30 days as a probe stay. Cramped for 90 days as a couple.

Setagaya. Studios median ¥90,000 at 23.7m² (¥3,797 per m²). One-bedrooms median ¥168,000 at 40.9m² (¥4,108 per m²). The per-square-metre numbers are close but not identical. You do pay about 8% more per metre for the one-bedroom.

Filter to recent buildings only and the gap shrinks. Setagaya studios aged 10 years or under median ¥118,000. The matching one-bedrooms median ¥170,000. The gap drops from ¥78,000 to ¥52,000. New-construction studios pull their weight. Older studio stock was pulling the headline median down.

The trade-off in Setagaya is the train line. Cheap studios cluster in west Setagaya, around Kyodo, Soshigaya-Okura, and Sakurashinmachi, on the Odakyu and Den-en-toshi local trains. The new one-bedrooms cluster around Sangenjaya and Komazawa, where the Den-en-toshi morning rush is the worst on the rail map. Pick the layout you can sleep in. Pick the line you can stand to commute on.

Bunkyō. Studios median ¥110,000. One-bedrooms median ¥195,000. Headline gap ¥85,000, which looks big. Per square metre, ¥4,661 vs ¥4,733. Effectively the same. Median building ages: 20 years for studios, 7 for one-bedrooms.

Most of Bunkyō's new construction is one-bedroom stock built for small families and academic couples on postings at Tokyo Daigaku and Ochanomizu hospitals. For a couple on a bridge stay near Hongo, Yushima, or Sendagi, the one-bedroom is the right pick. The metre rate is the same. You are paying for central air, modern bathroom fixtures, and a kitchen larger than a hot plate.

---

Group 2: same test result, huge age gap on the one-bedroom side

Toshima around Mejiro and Ikebukuro has a ¥74,000 gap. Nakano has an ¥84,000 gap. Per square metre, prices come in at about ¥4,200 for studios and ¥4,400 for one-bedrooms in Toshima. Nakano is ¥3,982 vs ¥4,328.

The age difference on the one-bedroom side is the largest on this list. Toshima median ages: 5 years for one-bedrooms, 15 for studios. Nakano runs 6 against 17.

Take the one-bedroom in either ward if your stay runs 60-plus days. The studio stock includes a chunk of the older shitamachi (下町 — shitamachi, "lower city," the older low-rise neighborhoods built up before the 1970s) buildings. The room dimensions reflect that.

The exception is Nakano's Numabukuro corner on the Seibu Shinjuku line. Newer studios there median ¥98,000 at around 24m². Couples who only need a bedroom-plus-kitchen for 30 days can stay there cheaply without the older-building pain.

---

Group 3: not really about layout

Both Shinjuku and Shibuya behave differently from the residential wards above. The per-square-metre test still works. The bigger question is whether you should be in these wards at all on a midterm couple's stay.

Shinjuku. Studios median ¥121,000. One-bedrooms median ¥194,000. Gap ¥73,000. Per square metre, ¥4,821 vs ¥4,874. The layout is not what is driving the price. What matters is which part of Shinjuku you sleep in. Wakamatsu-kawada and Yotsuya residential areas carry hospital noise at night. Yochomachi and Higashi-Shinjuku one-bedrooms newer than 8 years are the safe shortlist.

Shibuya. Studios median ¥126,000 at ¥5,228 per m². One-bedrooms median ¥230,000 at ¥5,569 per m². Gap ¥104,000.

Per-square-metre prices run 30 to 40% above the residential wards above. The newer one-bedrooms cluster around Hatsudai, Shoto, and Hatagaya, which is why the one-bedroom median age is 11 years here. The studio stock is older and cheaper per metre, but the noise problem stacks on top.

For a midterm couple, the choice in Shibuya is not studio vs one-bedroom. It is whether to be in Shibuya at all. Setagaya is 18 minutes away on the Den-en-toshi line. Most couples will sleep better there.

---

Group 4: the test does not fold the gap away

Minato is the one ward on the list where dividing rent by floor area does not collapse the gap. Studios median ¥141,000 at 25.5m² (¥5,529 per m²). One-bedrooms median ¥266,000 at 44.8m² (¥5,938 per m²). Both layouts median 19 years old. Building age is held constant. The ¥125,000 gap is genuinely paying for the bigger floor plan.

That makes Minato built differently from every other ward on this list. The one-bedroom does cost more per square metre, and the gap is honest.

It is also hard to justify on a 30-to-90-day stay. ¥266,000 a month for a 44.8m² one-bedroom works out to about ¥8,800 a night. Airbnb hits the crossover at 19 nights against most monthly mansions. Against Minato one-bedrooms, the crossover never lands.

Skip Minato for any midterm couple paying their own rent. The exception is corporate relocation. The company is paying. The partner has a job in the Akasaka or Toranomon tower cluster. If your partner's time is worth ¥5,000 an hour, the shorter commute pays back the rent difference. Outside that case, take Bunkyō or Setagaya. Expect to call a taxi twice a month for the Roppongi dinner. Let the numbers work for you.

---

How to actually run the test on a listing

Before this article fades into prose. The test is one line of arithmetic, and you can run it on any listing in front of you.

• Open the listing page. Note the asking rent and the floor area in square metres.
• Divide rent by floor area. Write that number down.
• Open the listing for a one-bedroom in the same building (or a unit at the same station, same age range).
• Divide that one's rent by its floor area.
• Compare the two numbers.

If the two metre rates match within ¥100 or so, you are not paying for the layout. The extra rent is paying for more floor area and probably a newer building. Take the bigger unit if your budget allows.

If the one-bedroom comes in 10% or more above the studio on the metre rate, the layout itself is part of the price. That is the Minato pattern. Either pay it knowing what you are buying, or move the search to a ward where the test passes.

A note on the building-age check. Open the listing on Athome and look for the 築年数 (chikunensū — building age in years, the number you want on every property comparison). The one-bedroom is almost always younger than the studio in the same ward. Knowing by how many years tells you whether you are paying for the layout or for the construction year.

---

Bridge-housing changes the question

Families on bridge stays waiting for permanent placement face a different decision. The studio shortlist drops out. Even a couple with one child does not fit a 22m² unit for 60 days. The real comparison becomes one-bedroom vs two-bedroom.

Two layouts to consider. The older two-bedroom layout (two small rooms, no living room) sits ¥10,000 to ¥25,000 below the one-bedroom in most wards. There are not many of these on the market. The full two-bedroom layout (with a living room) runs ¥40,000 to ¥80,000 above the one-bedroom. It gives you a separable bedroom for the child.

For a 90-day bridge stay with one child on a tight budget, target an older two-bedroom in Setagaya or Suginami. ¥150,000 to ¥185,000 for 38 to 43 square metres. The older layout buys you the second room.

A note on furnished bridge-housing supply. Most furnished mid-term inventory is one-bedrooms. Two-room furnished apartments are rare. Plan to email three operators and wait 48 hours for unit availability against your dates.

---

The picture across all 13 wards

The per-square-metre test sorted the wards into four shapes:

• Group 1 (gap dissolves on the test): Suginami, Setagaya, Bunkyō. Take the one-bedroom if the budget can stretch. The gap is paying for floor area and newer construction at the same metre rate.
• Group 2 (same test result, big age advantage on one-bedrooms): Toshima, Nakano. Take the one-bedroom for 60-plus-day stays. Numabukuro on the Seibu Shinjuku line is the cheap-studio pocket if you want one.
• Group 3 (test result is not the question): Shinjuku, Shibuya. The layout barely moves the price per metre. The real decision is whether to be in these wards at all. Most midterm couples are better off taking Setagaya.
• Group 4 (test does not fold the gap away): Minato. The one-bedroom costs more per metre and the gap is honest. Outside corporate relocation, skip the ward.

The picture by reader case:

• A 30-to-90-day couple's stay on a market budget. Take the one-bedroom in Suginami, Setagaya, or Bunkyō. You are buying eighteen more square metres and twelve fewer years of building age at the metre rate the market already sets.
• If your budget is tight at ¥120,000 or under. A 25-plus-year-old studio in west Setagaya or Suginami. The air conditioner will be loud. The walls will be thinner. You spend ¥30,000 a month less. Livable for 30 days. Cramped for 90.
• A bridge stay with a child. An older two-bedroom in Setagaya or Suginami, even with the older layout. The second room earns its keep.
• A corporate relocation paying its own rent. Minato if the partner's commute lands inside Akasaka or Toranomon. Otherwise read the building-year column before the floor-plan letter.

The maxim. The gap is about age more than layout. Two studios at the same price per square metre are not the same product. One can be 25 years old, the other 5. The floor-plan letter tells you almost nothing on its own.

---

— HalfKey runs furnished studio and one-bedroom Tokyo apartments for stays of 30 days to 12 months. Browse listings for your dates.