Setting Up Internet When You Move in Japan

Internet takes longer to set up than any other utility

Of all the things you switch on when you move into a new place in Japan, internet is the one that punishes procrastination. Electricity is usually a same-day form. Gas needs a technician visit but can often be booked within a week or two. Fiber internet — 光回線 (hikari kaisen) — can require actual construction work (工事, kouji) inside or outside the building, and slots for that construction routinely run 2–4 weeks out, longer during the March–April moving rush. If you want fiber live on the day you move in, order it weeks before your move date, not after.

If your timeline is already tight, don't panic — a ホームルーター (home router, a pocket-Wi-Fi-style device on the mobile network) can be shipped and working the same day you plug it in, with zero construction. It's slower and less stable than fiber, but it's the honest fallback when you can't wait a month for a technician.

Check before you sign: is the unit actually fiber-ready?

The best time to find out whether fiber will be easy or painful is before you sign the lease, not after. Ask the agent or landlord two things: whether the unit already has a 光コンセント (optical outlet), and whether the building itself is 光対応 (fiber-ready, meaning fiber has already been run to the building). If both are true, a provider can usually activate service with minimal or no construction. If neither is true, expect exterior building work that requires landlord sign-off and a longer lead time. See our guide to getting landlord permission and confirming fiber-readiness before you sign for exactly what to ask.

Already have fiber? Decide: transfer or re-contract

If you're moving from one Japanese apartment to another and already have a fiber contract, you don't automatically need to cancel and start over. Most providers offer an 移転 (iten, transfer) option: you keep your existing contract and move the service to the new address, which can mean no new construction fee and no reset of your contract term (useful mid-way through a term-based discount). Call your current provider and ask specifically about 移転 before assuming you need to cancel.

That said, transferring isn't always cheaper. New-customer campaigns (cashback, waived construction fees, discounted first months) are often only for new sign-ups, not existing customers transferring their line. Compare the transfer fee and remaining contract terms against what a competitor is currently offering new customers at your address — sometimes re-signing elsewhere genuinely saves more than staying put.

Watch your renewal month before you cancel

If part of your move involves cancelling internet entirely — moving in with a partner, leaving Japan, or switching to mobile-only — check your contract's 更新月 (koushin-tsuki, renewal month) before you pull the trigger. Many Japanese internet contracts auto-renew for a fixed term (commonly 2 years) and only allow penalty-free cancellation in a narrow window, often just one month, around the renewal date. Cancel outside that window and you can be hit with a 違約金 (iyakukin, early cancellation penalty) that can run into the tens of thousands of yen. Our guide to common internet contract traps in Japan walks through how to find your renewal month and what the typical penalty structures look like.

Sequencing your move: what to book first

Because construction lead time is the real bottleneck, internet should be the first utility you touch when you start planning a move — ideally as soon as you have a signed lease and a move-in date. Electricity can usually wait until the final week; it's typically just an online form or a postcard left in the breaker box, and supply starts the same day you flip the switch. Gas sits in between: it needs an in-person technician appointment for safety checks, so book it a week or two out, but it doesn't carry fiber's multi-week construction risk. For the full picture of what else to budget and schedule around a move — deposits, key money, furniture, and utility timing — see first-apartment setup costs (deposits, furniture, utilities) at Move-In Cost Japan, and for the electricity side, setting up electricity when moving, at Electricity Cost Japan.

If you're still deciding between waiting for fiber construction versus starting with a home router and switching later, our comparison of home router vs. fiber lays out the speed, cost, and reliability trade-offs so you can pick the right fallback for your timeline.

Move-in internet checklist

1. As soon as you have a lease signed, ask the landlord/agent about 光コンセント and 光対応 status if you haven't already.
2. If you already have fiber, call your current provider and ask about 移転 (transfer) versus cancelling — compare against new-customer offers at the new address.
3. Order fiber at least 3–4 weeks before move-in if construction is required; order earlier during the March–April rush.
4. If your timeline is under 2–3 weeks, arrange a ホームルーター as a same-day fallback and plan to switch to fiber later once it's installed.
5. If you're cancelling a contract as part of the move, check your 更新月 first to avoid a 違約金.
6. Book gas turn-on for a specific appointment window; it needs someone home.
7. Confirm electricity start-of-supply last — it's the most flexible and usually needs no appointment.

Still weighing your options? Check our FAQ for quick answers on contracts, campaigns, and typical setup timelines.