Nearly half of Japan new single-family homes gain quality certification

Adam German
Jul 23
3 min read

Almost half of Japan’s newly built single-family homes now meet the government’s Long-Term Quality Housing standard, but the certification remains virtually absent from the existing housing market.

Key Points:

49.8% of new single-family housing starts received certification in fiscal 2025, up from 31.3% two years earlier.

Adoption among multifamily homes remained low at 2.4%.

Only 127 existing homes received certification during the year.

Certification provides an official quality and maintenance framework, but it is not a substitute for a building inspection.

The Ministry of Land, Infrastructure, Transport and Tourism said 155,838 new single-family homes received certification during the fiscal year ended March 2026.

That represented 49.8% of new single-family housing starts, up from 39.3% in fiscal 2024 and 31.3% in fiscal 2023.

Carpenter cutting into wood at a Japanese single-family home site.

The figures suggest Japan is rapidly raising the quality baseline for new single-family homes. However, the improvement is doing little to address the transparency and valuation problems affecting the much larger existing housing market.

Certification becomes mainstream

Japan introduced the certification system for newly built homes in 2009.

To qualify, a property must have an approved construction and maintenance plan covering areas such as structural durability, earthquake resistance, energy performance and access for inspections and repairs.

Owners must continue inspecting and maintaining the property in line with the approved plan. Certification is therefore intended to shape how a home is cared for throughout its life, rather than acting only as a construction-stage label.

MLIT’s latest release does not identify a single reason for the rapid increase. However, financial incentives may be contributing.

Depending on the property and purchaser, certified homes can receive preferential tax treatment and may qualify for enhanced housing-loan arrangements.

These benefits give developers and buyers a reason to pursue certification, while the increase suggests that meeting the standard is becoming embedded in new single-family construction.

Condominiums remain far behind

Only 9,433 new homes in multifamily buildings received certification during fiscal 2025, equivalent to 2.4% of starts in that category.

That was up from 1.8% the previous year and 1.1% two years earlier, but remained far below the 49.8% recorded for single-family homes.

One possible reason is that condominium certification depends on the wider building, not only an individual unit.

Structural durability, shared systems and long-term maintenance must be addressed at building level. An individual buyer therefore cannot generally obtain certification independently of the developer, building design and management framework.

Certification is not an inspection

Long-Term Quality Housing certification should not be confused with a pre-purchase building inspection.

It confirms that an approved construction and maintenance plan met prescribed requirements. It does not guarantee that a property will remain free of defects or major repair needs.

A buyer considering an older certified home should still review inspection, repair and maintenance records and, where appropriate, commission an independent building inspection.

The main value of certification is partly the information it creates. A documented history can give future buyers more insight than the age of the building alone.

Existing single-family homes barely represented

The system was extended to homes undergoing major alterations in 2016 and to existing homes without associated construction work in October 2022.

Despite that expansion, uptake remains extremely limited.

Only 127 existing homes received certification during fiscal 2025. Since the non-construction route was introduced, just 311 properties have been approved nationwide.

A further 67 homes undergoing extensions or alterations received certification during fiscal 2025.

At this level of adoption, the system is not functioning as a widely used quality label for Japan’s existing housing stock.

This matters because buyers often struggle to distinguish a well-built and carefully maintained older home from another property of the same age that has received little investment.

Without consistent records or an independent quality measure, buyers, lenders and valuers may continue placing substantial weight on building age rather than actual condition.

What it means for buyers and owners

For buyers of newly built single-family homes, certification is becoming a mainstream feature rather than an unusual premium addition.

It provides an official reference point when comparing construction quality, energy performance and future maintenance requirements.

However, certification also brings responsibilities. Owners are expected to follow the approved maintenance plan and retain records of work carried out.

Certification does not guarantee a higher resale price. However, a documented maintenance history may help owners show that a home has been cared for to a higher standard than another property of a similar age.