What to Do If You Lose Your Rental Apartment Keys — A Complete Guide to Spare Keys, Lock Replacement Costs, and Procedures

2026-04-28

When you lose your keys, who should you contact first? Who pays for the replacement? We explain in detail the timing and important points for lock replacement.

What to Do If You Lose Your Rental Apartment Keys — A Complete Guide to Spare Keys, Lock Replacement Costs, and Procedures

#Key #Key Replacement #Key Loss #Rental Troubles #Troubleshooting #Property Management #Costs #Move-out Restoration #Rental Guide

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Reviewed by: Nobuyuki MoriPresident, M-Assets Co., Ltd. / Licensed Real Estate Transaction Specialist (Miyagi #018212)

What to Do First If You Lose Your Keys

If you lose your keys at a rental property, don't panic—follow these calm, step-by-step procedures.

1. Determine Where You Lost Your Keys First, retrace your steps through your wallet, bag, and the places you visited. Since your keys may have been turned in as found items, check the lost and found at shops, transportation facilities, and public buildings you visited.

If you can't find your keys, contact your property management company or landlord promptly. During late-night hours or holidays, call the emergency contact number. Tell them you may have lost your keys, and the management company will arrange either a spare key loan or dispatch a locksmith.

When a Rental Ventilation Fan Stops Working, Makes Noise, or Breaks: Who Pays for Repairs? What to Do If the Landlord Won't Fix It

Repair costs for a rental property's ventilation fan or range hood that stops working or makes noise are generally the landlord's responsibility if caused by normal wear and tear or natural failure; the tenant is responsible if the failure results from neglecting cleaning. This article explains the breakdown of responsibility by the cause of noise (such as loud or high-pitched sounds), location-specific checks for toilet, bathroom, and kitchen, lifespan and replacement costs, and procedures for rent reduction and self-repairs when the management company won't fix it—all based on Japan's Ministry of Land, Infrastructure, Transport and Tourism guidelines.

Complete Guide to Rental Move-Out Notice and Cancellation Procedures—When to Act and Step-by-Step Instructions Explained

When vacating a rental property, move-out notice is essential. A real estate professional explains in detail the required notice period, the procedure flow, and what you need to do before moving out. We also cover important points for avoiding penalties.

The Complete Washlet Guide for Renters—From Checking Installation Eligibility to DIY Setup Steps

Want to install a washlet in your rental but unsure if you're allowed? This guide covers what to check during property viewings, how to get permission from building management, aftermarket installation methods and costs, and move-out restoration rules—all explained simply.

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Lock Type	Estimated Cost
Standard disk cylinder lock	¥10,000–20,000
Pin cylinder lock (anti-picking type)	¥20,000–40,000
Dimple key lock	¥30,000–50,000
Electronic lock / smart lock	¥50,000+

What to Do If You Lose Your Rental Apartment Keys — A Complete Guide to Spare Keys, Lock Replacement Costs, and Procedures

What to Do First If You Lose Your Keys

Other columns

When a Rental Ventilation Fan Stops Working, Makes Noise, or Breaks: Who Pays for Repairs? What to Do If the Landlord Won't Fix It

Complete Guide to Rental Move-Out Notice and Cancellation Procedures—When to Act and Step-by-Step Instructions Explained

The Complete Washlet Guide for Renters—From Checking Installation Eligibility to DIY Setup Steps

What to Do If You Lose Your Rental Apartment Keys — A Complete Guide to Spare Keys, Lock Replacement Costs, and Procedures

What to Do First If You Lose Your Keys

Other columns

When a Rental Ventilation Fan Stops Working, Makes Noise, or Breaks: Who Pays for Repairs? What to Do If the Landlord Won't Fix It

Complete Guide to Rental Move-Out Notice and Cancellation Procedures—When to Act and Step-by-Step Instructions Explained

The Complete Washlet Guide for Renters—From Checking Installation Eligibility to DIY Setup Steps

How to Borrow a Spare Key and Important Cautions

Lock Replacement Costs and Who Pays

Lock Replacement Procedure

If Your Lost Key Is Found Later

How to Prevent Key Loss

Summary

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