The Complete Guide to Renovating and DIY in a Japanese Rental: Landlord Permission and Genjo Kaifuku Rules

Renovating or doing DIY in a Japanese rental apartment carries both a distinctive appeal and a distinctive difficulty. Wanting to shape a rental into a space you like is natural, but in Japan the unit remains legally the landlord's property to a greater degree than in many Western leases. That is exactly why getting permission before starting any work, and putting that agreement in writing, is essential. Renovate without authorization, and you risk being billed a steep genjo kaifuku (原状回復, "restoration to original condition") fee at move-out.

As the representative of INA&Associates and someone involved in day-to-day rental management here, I have put together the rules that let both landlord and tenant move forward on a renovation with confidence. In keeping with our commitment to trust and candor, I lay out both the benefits and the real risks.

Can You Renovate or DIY a Rented Property in Japan?

Yes: renovation and DIY are possible in a Japanese rental, but with a clear precondition. Since the unit is not the tenant's property, Japanese practice requires landlord permission for renovation as a baseline rule — stricter than the "ask first, informally" habit many Western tenants know. Assuming "a small DIY project surely won't matter" is one of the most common paths into a dispute.

The Basics of Japanese Lease Agreements and the Genjo Kaifuku (原状回復, Restoration) Obligation

Under a standard Japanese lease, the tenant must restore the unit to its original condition at move-out — the genjo kaifuku (原状回復) obligation, which goes further than "normal wear and tear" clauses in most Western leases. The 国土交通省 (Ministry of Land, Infrastructure, Transport and Tourism, MLIT) guideline on restoration disputes draws the line this way: deterioration from ordinary use is the landlord's cost; damage from the tenant's intentional acts or negligence is the tenant's. DIY and renovation often fall into the latter, which is why advance agreement matters.

The Risk of Renovating Without Permission

Unauthorized renovation can be treated as a breach of contract. The most common consequence is being billed the full restoration cost at move-out, though severity can escalate this into a damages claim or, in bad-faith cases, termination. Raising the request openly, rather than hiding it, usually earns tenants more freedom, not less.

The Basic Steps for Getting Permission

Getting permission is a process to follow, not a matter of instinct. The steps below make the request easier to evaluate and raise your odds of approval.

Step	What to Do	Key Point
1. Consultation	Contact the property management company (real estate agency) first	Establishes the channel to the landlord
2. Present a plan	Specify the area to be modified, materials, method, and who bears the cost	Diagrams or photos make it easier to approve
3. Obtain consent	Get the landlord's permission	Confirm conditions too (colour, scope)
4. Put it in writing	Draft a consent form / written agreement	Spell out whether restoration will be required

What matters most is describing the renovation specifically and honestly. Work that raises the property's value benefits the landlord too, so approval comes more easily.

A Verbal Promise Is Not Enough — Always Get It in Writing

Verbal permission alone leaves you little way to push back if you're later told at move-out that restoration is required after all. Staff turnover or a gap in recollection can quietly undo an agreement that once seemed settled. Any agreement that restoration will not be required must be documented in writing, typically as a written consent form (承諾書). A written record keeps its force even after the original staff member is gone.

What to Watch For With Renovations That Will Require Restoration

Even approved renovations often come with the expectation that they will be reversed at move-out. How well you prepare for that shapes your eventual cost.

Always Keep the Original Parts You Remove

When a renovation replaces a fixture, it is essential not to throw away the original parts — keep them in storage. Restoring the fixture at move-out is typically the tenant's cost, and if the original parts are gone, sourcing replacements adds on top, sometimes pushing the extra bill into the tens of thousands of yen (roughly ¥30,000–¥100,000, or approx. $195–$650 at 155 JPY/USD).

Damage to the Substrate Tends to Become an Expensive Repair

Fixed shelving or tile work needs particular care whenever it reaches the substrate beneath the surface — the shitaji (下地), the structural layer under the wallpaper. If repair can't stop at re-papering the wallcovering (kurosu, クロス) and has to reach the substrate, cost balloons quickly. A method that leaves the substrate untouched is the shortest path to keeping costs down.

Renovations That Tend to Win Landlord Approval

From the landlord's side, renovations that raise asset value or occupancy tend to be welcomed — one of the few areas where landlord and tenant interests genuinely align.

• Installing a washlet (温水洗浄便座, a heated, water-spray toilet seat standard in most Japanese homes): strongly tied to occupancy appeal, so this tends to be an easy approval
• Replacing tatami with flooring (フローリング, Western-style wood flooring): demand for a Western-style room is high, so landlords tend to be receptive
• Updating plumbing and water-heating fixtures: if aging or malfunctioning, the cost is sometimes split with, or covered by, the landlord
• Re-papering the wallcovering (クロス, kurosu): an easily restorable colour such as white or cream tends to make approval easier

DIY Ideas That Are Easy to Restore at Move-Out

For tenants who want a small personal touch without a full construction project, DIY that leaves no trace at move-out is the better fit. A growing category called DIY-gata chintai (DIY型賃貸, "DIY-permitted rental") allows small modifications written into the contract as not requiring restoration.

DIY Method	Effect	Ease of Restoration
Peel-and-place floor tiles or cushion flooring	Refreshes the look of the floor	Peels off cleanly, easy to restore
Tension-mounted shelving systems (such as Diawall)	Adds storage without drilling into the wall	Easy to remove
Window film (glass film)	Heat and UV blocking, plus privacy	Choose an easy-peel type
Masking tape	Accent for walls or doors	Low risk of damaging the wall surface

In every case, test on an inconspicuous spot first and confirm how cleanly it peels off before applying it to a larger area.

How Cost Responsibility Is Typically Allocated, and Tips for Negotiating

Who bears the cost depends on the nature of the renovation. Here is a rough breakdown — treat it as a guide, since the lease and any individual agreement always take precedence.

Nature of the Renovation	Typical Cost Responsibility
Renovation driven by tenant preference (including DIY)	As a rule, the tenant's responsibility
Repair of aging or malfunctioning equipment	Landlord's responsibility, or sometimes split
Improvement that raises the property's asset value	Room to negotiate a split or landlord-borne cost

In negotiation, framing the proposal around the landlord's own interests is what works. Explaining concretely how the renovation contributes to occupancy or asset value moves you closer to an agreement on splitting the cost. Numbers and evidence, not sentiment, are what build trust.

The INA Perspective — Rental Renovation Is, at Its Core, an Exercise in Building Trust

At INA&Associates, we think of property management as managing a building and managing a relationship between people at once. A renovation or DIY request is a rare moment where landlord and tenant sit down face to face, and whether both sides share information honestly here shapes satisfaction for the rest of the tenancy.

What we value above all is the well-being of everyone involved: the tenant living comfortably, and the landlord's asset protected and allowed to grow. That is why we lay out not only the benefits but also the real risk of restoration costs and cost-sharing questions, even when that's not what a tenant wants to hear. We believe candor now builds trust that lasts. We continue to publish our ongoing analysis of rental management and renovation in the Real Estate Network category.

Summary

Renovation and DIY in a Japanese rental are entirely achievable when you follow the correct process. The three essentials: get the landlord's permission before starting, put the agreement in writing, and never neglect restoration-minded methods or keeping the original parts in storage. Raising the request openly is, counterintuitively, the fastest route to more freedom — not less.

When in doubt, consult the property management company rather than proceeding on your own judgment. We work with both landlord and tenant to find a landing point both sides accept. We hope shaping your space becomes the starting point for a better life — and a good relationship.

Frequently Asked Questions

Q1. What happens if I do DIY work in a Japanese rental without the landlord's permission?

You risk being billed the full restoration cost when you move out. Depending on severity, this can be treated as a breach of contract, leading to a damages claim or even lease termination. We recommend consulting the landlord in advance even for small changes.

Q2. How do I prove that an agreement waiving restoration exists?

Document it with the landlord or management company in writing, typically as a written consent form. Verbal promises are prone to disputes when staff change or memories differ. Spelling out the specific area and whether restoration is required prevents disagreements later.

Q3. Are there cases where the landlord will cover the renovation cost?

Yes — if plumbing or other fixtures are aging or malfunctioning, the cost may be split or covered entirely by the landlord. Explaining the situation carefully and showing the effect on asset value or occupancy makes a positive response more likely.

Q4. What is DIY-gata chintai (DIY-permitted rental)?

A rental unit whose lease explicitly permits the tenant to renovate or DIY at their own expense, with the restoration obligation waived or partially waived. Tenants gain freedom to shape the space, but the cost is basically theirs to bear. The category has been gradually spreading in Japan in recent years.

Q5. What happens if I've lost the original parts I removed by the time I move out?

The cost of sourcing an equivalent replacement typically falls on the tenant. Start by asking the landlord or management company whether a substitute part is acceptable. Keeping removed parts in a dedicated storage box from the outset is the simplest way to avoid this cost.