Over 60% Still Have Their Own Room at Their Parents' House; Experts Warn of "Poorly Managed Vacant Home" Risks, Philia Corporation Survey Reveals

Philia Corporation (Itabashi-ku, Tokyo; Representative Director: Naoyuki Koshikawa), which operates a support site for regenerating distressed real estate, conducted a questionnaire survey of 500 men and women nationwide on whether they still have their own room at their parents' house. Details are available in their column.

Decades after moving out, many people still recall "their room at their parents' house." This survey targeted 500 men and women nationwide to explore this topic, analyzing the potential future risks from the perspective of on-site experts.

[Survey Overview] Target: Men and women aged 30 and over nationwide Period: April 17-18, 2026 Institution: In-house survey Method: Optional online response Valid Responses: 500 people (Male: 241 / Female: 259)

[Survey Summary] - 62.4% responded that they "still have" their own room at their parents' house. - Only 30.0% said they "do not," revealing that many families preserve childhood rooms. - The main reasons for keeping the room are "for lodging during visits," "parental sentiment," and "for storage."

Results showed that 62.4% of people still have their room maintained after leaving home.

Among the 312 individuals who still have their room, the top reasons were: 1. Lodging for return visits (30.4%) [Expert's View] Maintaining a room used only a few days a year can lead to "poor management" of the entire house and accelerate building deterioration. If the house might become vacant in the future, organizing it early is crucial.

2. Parents wish to keep it as is (24.7%) [Expert's View] While this is a parental sentiment, there are many cases where buildings deteriorate rapidly once parents can no longer manage them. There's a risk of property tax increasing up to six times if designated a "poorly managed vacant home."

3. It has become a storage room (18.6%) [Expert's View] This poses the highest risk of becoming a "hidden hoarder house," causing mold and termite damage. A large amount of leftover items can lower the selling price or lead to a purchase refusal from real estate agents.

4. Feeling of eventually returning (15.1%) [Expert's View] While you procrastinate, the building deteriorates. If the house is on land where rebuilding is prohibited ("saikenchiku-fuka") or is an old row house, finding a general buyer becomes extremely difficult.

5. No time to clean up (11.2%) [Expert's View] The situation worsens with time. Seeking professional help is a rational choice.

[Conclusion] The survey found that 62.4% of people over 30 still have their rooms at their parents' house, but experts point out the risks of accelerated aging of the building, future tax hikes, and decreased asset value. To prevent a memorable family home from becoming a "negative asset," it is wise to discuss future measures and "pre-inheritance decluttering" while parents are still healthy.

Philia Corporation specializes in the purchase and resale of "problem properties" that are generally difficult to sell, such as properties where rebuilding is not permitted, shared-ownership properties, and old row houses.