Due Diligence · Structure Condition

Termites, Mold, and Roof Leaks: What Listing Photos Don't Tell You About an Akiya

Author: AkiyaHub Team
Published: September 7, 2026

Contents

A tidy house in the photos can still hide expensive problems

A clean tatami room, polished wood paneling, or a usable-looking kitchen can make an akiya feel reassuring. But listing photos usually show how a house looks at a glance. They rarely tell you what is happening under the floor, inside the walls, above the ceiling, or around the foundation.

That gap matters. A ¥5 million house may still be a sensible purchase, but only if its condition, repair needs, and intended use fit your budget. Water damage, wood rot, termites, mold, aging utilities, and deteriorating materials can turn a low purchase price into a much larger project.

The goal is not to diagnose a house from photos or reject every older property with a stain or crack. It is to recognize warning signs, ask better questions, and understand what still needs proper investigation before you commit.

Before looking at individual warning signs, it helps to be clear about the limits of a listing. Photos can tell you whether a home appeals to you. They cannot confirm whether it is dry, sound, or ready for the use you have in mind.

Before you investigate

Quick answer: what listing photos usually cannot tell you

Listing photos can help you judge layout, light, room finishes, and the general atmosphere of a home. They are much less reliable for assessing the condition behind visible surfaces.

What may still need investigation

1Active or historic roof leaks, moisture behind walls or under floors, and deterioration in the roof space.
2Termite damage, wood decay, and the cause of soft, sloping, or uneven floors.
3The condition of electrical, plumbing, drainage, older materials, and hidden repair work.
4Whether visible mold is a surface issue or evidence of an ongoing moisture problem.

If you only investigate one category carefully, start with water. A small leak or persistent dampness can affect several parts of an older house at once.

Condition check 01

Start with water

Water is one of the main causes of expensive problems in older homes. It can damage ceilings, walls, insulation, and timber, while long-term moisture can contribute to mold, wood decay, and termite risk.

Look for past or current moisture

✓Check ceilings and walls for stains, discoloration, peeling wallpaper, bubbling finishes, or warped wood.
✓Notice damp or musty smells, visible roof damage, damaged flashing, and failing gutters.
✓Ask whether recently patched, covered, or repainted areas were repaired after a known problem.

The useful question is not simply whether there is a stain. Ask what caused it and whether the cause was fixed.

Water problems and timber problems often overlap. Once moisture has been present for a long time, the condition of the wood deserves a closer look.

Condition check 02

Check for termites and wood decay

Many akiya are timber-framed homes, so the condition of the wood matters. Termites and long-term moisture can damage timber in places a tidy room does not reveal.

Questions worth asking

□Has the property been inspected for termites, and has it been treated before?
□Are there records of treatment, repairs, or recurring issues?
□Is there visible damage in accessible areas beneath the house or around exterior timber?

A new kitchen can wait. Significant damage to the timber supporting the house may not.

Photos cannot tell you how a house feels underfoot. A viewing, whether in person or through a detailed walkthrough, can reveal clues that are easy to miss in a listing.

Condition check 03

Treat uneven floors as a clue

A viewing gives you information that listing photos cannot. Pay attention to how the floor feels as you walk through the house, especially in rooms that look clean and finished.

Notice how the house feels underfoot

□Does the floor feel solid, or does it noticeably slope?
□Are there areas that feel soft, springy, or unstable?
□Do other signs of moisture, decay, or movement appear nearby?

Uneven floors can result from settlement, deteriorated framing, moisture, termite damage, or stable imperfections in an older home. The point is to find out which situation you are dealing with.

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Uneven floors are only one possible sign of movement. Cracks, sticking doors, and misaligned openings are more useful when considered together than when treated as isolated defects.

Condition check 04

Look at cracks, doors, and signs of movement together

Older homes develop cracks. One crack rarely tells the whole story, but several signs in the same part of the building may justify closer investigation.

Compare signs, rather than isolating one

✓Look for large, unusual, or repeatedly repaired cracks.
✓Check whether doors and windows open and close normally.
✓Notice distortion around openings or surfaces that appear out of alignment.
✓Pay closer attention when several warning signs appear in the same area.

Mold is often visible before its cause is clear. It may reflect a house that has been shut up for a long time, but it can also point to moisture that still needs attention.

Condition check 05

Mold is not just a cleaning problem

Mold is common in homes that have been closed for long periods, particularly in Japan's humid climate. Visible mold may be a surface problem, but it can also point to moisture that is still affecting the building.

Find the source before planning the cleanup

□Could poor ventilation or condensation be contributing to the dampness?
□Could rain be entering the building, or could there be a plumbing leak?
□Are damp conditions beneath the house part of the problem?

Cleaning visible mold may improve the appearance of a room. It does not necessarily solve the source of the moisture.

The source of a damp interior is not always inside the house. Drainage, gutters, vegetation, and the ground around the building can all affect how water reaches or stays near the structure.

Condition check 06

Look outside the house too

It is easy to focus on the rooms during a viewing. Water problems may begin outside, where drainage, gutters, vegetation, and long-term dampness affect the building over time.

Trace where rainwater goes

✓Check whether the ground slopes toward the house or away from it.
✓Look for damaged, blocked, or overflowing gutters and places where water may collect.
✓Notice dense vegetation against exterior walls and accessible timber exposed to long-term dampness.

Condition is not limited to the structure. A house can look complete in photos while its wiring, plumbing, drainage, or equipment still requires testing or further investigation.

Condition check 07

Do not assume old systems work because they are installed

A house may have lights, outlets, plumbing, and a bathroom without those systems being ready for modern use. A visible outlet or pipe does not confirm condition, safety, or reliability.

Treat infrastructure as its own category

✓Older wiring may need updating.
✓Plumbing may be aging, damaged, or unreliable.
✓Some issues only become clear when systems are tested or investigated more closely.

This is where an attractive renovation plan can become misleading. The improvements you want to make are only one part of the budget. The house may need essential work before those plans can begin.

Budget check

Renovation can reveal costs you cannot see yet

Older buildings can contain defects or materials that become apparent only after renovation begins. A cosmetic budget can change quickly when hidden damage or older materials need investigation and special handling.

Separate two different budgets

01The work you want: kitchen, bathroom, and interior finish updates.
02The work the house needs: leak repairs, timber work, electrical updates, drainage improvements, or investigation of older materials.

A closer review can reduce uncertainty, but it should not create false certainty. An inspection is useful because it helps focus the next questions, not because it can reveal every issue inside an older house.

Due diligence

An inspection can reduce uncertainty, not remove it

In Japan, 建物状況調査 (tatemono jōkyō chōsa) broadly refers to an existing-home building condition survey or inspection. It can identify visible signs of deterioration and defects, but it is one part of a larger investigation.

Use findings to focus the next questions

✓Visible deterioration and defects may be identified through the survey.
✓Termites, hidden moisture, drainage, electrical systems, and specific structural concerns may still require specialist investigation.
✓The practical goal is fewer unanswered questions before you commit.

These issues are easier to understand when they are considered together. A property rarely becomes risky because of one small sign alone. The real question is how several unknowns may affect the buyer's budget and plans.

What this means in practice

A low listing price is only the first number

Imagine a buyer who finds a countryside house for ¥5 million. The rooms are clean, the kitchen looks usable, and the listing photos show a pleasant view.

A closer review changes the decision

✓A water stain appears near the ceiling.
✓One floor has a soft area, mold appears in a storage room, and the gutters look damaged.
✓None of these signs proves the house is beyond repair, but together they change what the buyer needs to investigate.

The question becomes: what will this property cost to make safe, dry, usable, and manageable for the buyer's plans?

You do not need to answer every question before saving a listing or deciding whether to learn more. Before spending serious money, though, you should know which questions need a proper answer.

Final pass

Questions to ask before you buy

You do not need a complete answer to every question before you save a listing. Before you spend serious money, you should know which questions still need a proper answer.

Property condition checklist

□Are there signs of current or previous roof leaks, water damage, mold, rot, or persistent dampness?
□Has the property been inspected or treated for termites?
□Are any floors soft, sagging, or uneven? Are there cracks, sticking doors, or other signs that need further investigation?
□Does rainwater drain away from the house, and are gutters, exterior surfaces, and accessible wood in reasonable condition?
□What is known about the electrical and plumbing systems, vacancy period, and maintenance history?
□Are there records of repairs, inspections, termite treatment, renovation work, or older materials that may add investigation and handling costs?

Buy with clearer questions, not false certainty

An older home does not need to be perfect to be worth buying. What matters is knowing which issues are cosmetic, which need further investigation, and which could change the budget or your plans for the property.

Before you move forward, separate the home you hope to create from the work the house may need first. A roof repair, damp subfloor, termite concern, or aging utility system does not automatically end the conversation. It does mean you need a clearer picture of the likely work, cost, and risk.

If you have found a property you are seriously considering, AkiyaHub can help you verify what is known, identify the questions that still need answers, and decide what should be checked before you commit.

Sources used for this article

Ministry of Land, Infrastructure, Transport and Tourism (MLIT): Existing-home transactions and building condition surveys - 既存住宅流通について（建物状況調査（インスペクション）活用に向けて） (text in Japanese)
- Building condition survey scope and inspection targets - 建物状況調査の実施主体・対象部位等 (text in Japanese)
- Basic knowledge of existing-home condition surveys - 既存住宅状況調査に関する基礎知識 (text in Japanese)
Ministry of Health, Labour and Welfare (MHLW): Asbestos guidance for renovation and demolition clients - 石綿総合情報ポータルサイト — “解体・改修工事の発注者のみなさま (text in Japanese)

Akiya Due Diligence Checklist: 10 Things To Check Before You Fall In Love

This article is part of AkiyaHub's due diligence series for buyers who want to look beyond the listing price before making an offer.

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