Flat 35 to add minor renovation financing from September
- Adam German
- 12 minutes ago
- 3 min read
Japan’s Flat 35 mortgage program will allow buyers of existing homes to include certain minor renovation costs in their home loan from September 1, 2026, reducing a financing hurdle for properties that need relatively simple work after purchase.
Photo by Roselyn Tirado on Unsplash
The Japan Housing Finance Agency (JHF) announced the change on August 18. It applies to renovation work that does not affect whether a property meets Flat 35’s technical standards. Flat 35 is a long-term fixed-rate mortgage offered through private financial institutions in partnership with JHF.
Key Points
From September 1, buyers using Flat 35 for an existing home can include eligible minor renovation costs in the mortgage.
The simplified treatment applies only to work that does not affect the property’s Flat 35 compliance.
A compliance inspection is required before the renovation, but no second inspection is required after eligible work is completed.
Under the new treatment, eligible renovation expenses can be financed together with the purchase of an existing home.
JHF says the property must undergo its Flat 35 compliance inspection before the renovation. For qualifying minor work, a second inspection after completion will not be required.
The scope is deliberately limited. JHF excludes work that changes elements relevant to the property’s compliance assessment, including moving columns, changing the floor plan, altering floor area or replacing insulation.
That makes the change most relevant to buyers planning relatively straightforward repairs or improvements rather than substantial remodeling.
A simpler route for homes that need minor work
The revision addresses a practical gap in financing existing homes.
A property may already meet Flat 35 standards but still need repairs or improvements before or shortly after the buyer moves in. Until now, buyers seeking to finance a purchase together with renovation work through Flat 35 have faced a more involved route when using Flat 35 Renovation.
Flat 35 Renovation is a separate program for buyers carrying out qualifying renovations to existing housing. In its purchase-and-renovate format, the property is checked before work begins and inspected again after completion to confirm compliance with both Flat 35 and Flat 35 Renovation standards.
There is also a timing difference. JHF states that Flat 35 Renovation funds for this format are released after renovation work is completed. Buyers who need to settle the property purchase earlier may therefore need bridge financing from a participating financial institution.
From September, eligible minor work can instead be included in ordinary Flat 35 financing without requiring the post-renovation compliance inspection.
This does not replace Flat 35 Renovation. The latter remains a separate program for qualifying renovation projects and can provide an interest-rate reduction when its requirements are met.
Why the change matters for Japan’s existing-home market
For buyers, the immediate significance is practical.
Older condominiums and single-family homes do not necessarily require major renovation, but buyers may still want to carry out repairs or modest improvements as part of the purchase. Allowing eligible costs to be included in the same long-term fixed-rate financing may make those transactions simpler to arrange.
The change also sits alongside other JHF programs intended to support purchases of existing housing.
Flat 35 Chuko (meaning Existing) Plus, for example, provides an interest-rate reduction for buyers purchasing existing homes that meet additional standards. Flat 35 Renovation separately targets purchases combined with qualifying renovation work.
The new treatment fills a narrower space between those programs: homes that already satisfy Flat 35 standards but need limited work that does not affect that compliance.
It does not turn Flat 35 into a general-purpose renovation loan. Structural changes, floor-plan alterations, changes to floor area and other work affecting the compliance assessment remain outside the simplified treatment.
But for buyers considering an existing home that needs only modest improvements, the September revision should give them another way to incorporate those costs into the financing of the purchase.
Further Reading:
Japan Housing Finance Agency — August 18, 2026: Flat 35 existing-home financing changes (Japanese only)
Japan Housing Finance Agency — Flat 35 Chuko Plus (Japanese only)
