One thing worth understanding when weighing a pre-owned condo's age is the new seismic standard (shin-taishin kijun), which took effect in June 1981. Buildings where the building confirmation application (kenchiku kakunin shinsei) was filed on or after June 1, 1981 fall under the new standard; those before that date fall under the old seismic standard (kyū-taishin kijun) — and this matters for mortgage and tax-incentive eligibility too. In short, checking whether a property meets the new seismic standard matters more than its age alone. Rather than judging a property purely by how old it is, it's essential to weigh seismic performance and management condition together.
- The new seismic standard applies to properties whose building confirmation application was filed on or after June 1, 1981.
- Some properties under the old seismic standard have been brought up to an equivalent level through seismic diagnosis and retrofitting.
- Even an older building can be in good condition if large-scale repairs have been carried out on a planned schedule.
- Tax incentives such as the home loan tax deduction can involve requirements tied to seismic standards or building age.
- Rather than judging by age alone, it's important to check management condition and repair history together with it.
The Line Between the New and Old Seismic Standards
The revised Building Standards Act took effect on June 1, 1981, and buildings whose building confirmation application was filed on or after that date fall under the "new seismic standard," while those before it fall under the "old seismic standard." The new standard is designed as a benchmark for seismic performance that can withstand an earthquake of roughly upper 6 to 7 on the Japanese seismic intensity scale without collapsing, so checking which side of this line a pre-owned condo falls on is the basic starting point. Note that there's often a gap between the building confirmation date and when construction actually finished, so it's important to judge based on the confirmation date rather than the completion year.
Points to Check if You're Considering an Old-Seismic-Standard Property
Even a building under the old seismic standard may have since undergone seismic diagnosis and retrofitting to bring it up to a level equivalent to the new standard. Rather than avoiding old-seismic-standard properties across the board, it's important to check with the management association or management company whether a seismic diagnosis has been done, what the results were, and what retrofitting history exists. This can also affect mortgage screening and eligibility for tax incentives. If a property hasn't had a seismic diagnosis done, there may be an additional cost for one, so it's reassuring to confirm who bears that cost as well.
The Relationship Between Building Age and Resale Value
An older building doesn't necessarily mean lower resale value — depending on location and management condition, a property's value can hold up even as it ages. At the same time, an extremely old property also needs to be weighed against the possibility of a future rebuild or a heavy burden from large-scale repairs. In particularly well-connected areas, demand for pre-owned condos tends to stay solid even as buildings age, and prices tend not to collapse sharply.
Check the History of Large-Scale Repairs
Condo buildings generally undergo large-scale repairs (daikibo shūzen) on roughly a 12- to 15-year cycle. When considering an older property, checking the history of past large-scale repairs together with the future repair plan and the status of the reserve fund makes it easier to judge how well the building has been maintained. How many years have passed since the most recent large-scale repair is also useful for estimating when the next one might come, and the likelihood of a special assessment.
How Tax Incentives Relate to Building Age
Some tax incentives, including the home loan tax deduction, can carry requirements tied to seismic standards or building age. For old-seismic-standard properties, additional procedures — such as obtaining a certificate of compliance with seismic standards (taishin kijun tekigō shōmeisho) — may be required. Since the details of these systems change from year to year, we recommend checking the latest information on the National Tax Agency's website or similar official sources. Some municipalities also offer subsidy programs for seismic retrofitting work.
Frequently Asked Questions
How can I tell whether a property is under the new or old seismic standard?
You can check the date on the building confirmation certificate, or the construction date on the property register. If the building confirmation application was filed on or after June 1, 1981, it falls under the new seismic standard.
Should I avoid buying an old-seismic-standard property?
There's no need to avoid it across the board. It's important to check whether a seismic diagnosis or retrofitting has been carried out, and judge based on whether the necessary seismic performance has been secured.
Does an older building mean I can't use the home loan tax deduction?
If certain requirements, such as seismic standards, are met, the deduction may still be available even for an old-seismic-standard property. Since the details of this system change from year to year, please check the latest information on the National Tax Agency's website or similar official sources.
Summary
When weighing a pre-owned condo's age, first check which side of the June 1981 line it falls on — new or old seismic standard — and if it's under the old standard, also check the status of any seismic diagnosis or retrofitting. Rather than judging by age alone, weigh it together with management condition and repair history for an overall judgment.