How Much Does It Cost to Convert a Vacant House into a Minpaku? A Breakdown by Property Size

Turning an unused vacant house into an income-generating asset through “minpaku conversion” is an exciting option full of potential. But before taking that first step, everyone wants to know the same thing: “How much is this actually going to cost?”

“I heard you can start with just a few hundred thousand yen…”

“No, wait, I heard restoring an old traditional house can cost over 10 million yen…”

With so much conflicting information out there, which is actually true?

Let’s start with the conclusion of this article.

The cost of converting a vacant house into a minpaku property varies enormously depending on the property’s “size,” its “condition,” and the “operating level (legal license)” you’re aiming for—the range truly runs from modest to substantial.

To help you avoid the regret of an unplanned investment, this article breaks down the detailed “cost components” needed to launch a vacant-house minpaku, and further simulates specific cost estimates by “property size.”

First, Grasp the Big Picture: Types of Costs Involved in Vacant-House Minpaku

From transforming a vacant house into a minpaku facility to launching operations, costs generally fall into five major categories.

1. Property-related costs: (mainly property tax if you already own the property; purchase or lease costs if you’re acquiring one)
2. Renovation costs: (building repairs, interior construction, etc.)
3. Licensing and legal procedure costs: (ryokan business license application, fire safety equipment installation, etc.)
4. Furniture, appliances, and supplies costs: (everything guests need for their stay)
5. Other miscellaneous expenses: (insurance premiums, pre-launch marketing costs, etc.)

Among these, **the two categories that vary most significantly based on property size are “2. Renovation costs” and “4. Furniture, appliances, and supplies costs.”**

[Most Important] Three Variables That Greatly Affect Costs

Before diving into the size-based simulations, let’s understand the three key factors that determine cost.

• 1. Property condition (degree of deterioration): If the building is relatively new and move-in ready, renovation costs can be kept minimal. But if it’s old with water leaks or requires structural reinforcement, renovation costs can climb to several million yen or more (in the tens of thousands to over 10 million yen range).
• 2. Target operating level (legal license): Whether you start under the “Minpaku Business Act” (capped at 180 days per year) or aim for a “ryokan business (simple lodging)” license (allowing 365-day operation) significantly affects the required level of fire safety equipment, creating a difference of several hundred thousand to several million yen in initial costs.
• 3. Interior and equipment grade: Costs vary widely depending on whether you go with a simple, minimal setup or invest in high-design furniture and value-added amenities like saunas or projectors.

[By Size] Vacant-House Minpaku Initial Cost Simulation

Here, we’ll simulate initial cost estimates for three property sizes, under the common assumptions that: “you already own the property,” “you’re obtaining a ryokan business (simple lodging) license and aiming for 365-day operation,” and “you’re going with mid-grade interiors and equipment.”

(*These are general estimates only; actual costs will vary significantly depending on the specific property’s condition.)

Case 1: Small Vacant House (Up to 50㎡ / Studio to 1LDK)

• Target guests: Couples, business travelers, solo travelers
• Renovation costs: ¥500,000–¥3,000,000. Since the property is relatively small, work mainly focuses on replacing plumbing/bathroom fixtures and refreshing the interior. However, older properties may require structural reinforcement, raising costs.
• Licensing and fire safety equipment costs: ¥500,000–¥1,500,000. Small facilities may be exempt from mandatory automatic fire alarm installation, but guide lights and fire extinguishers are still required. Includes administrative scrivener fees.
• Furniture, appliances, and supplies costs: ¥500,000–¥1,000,000. Beds, sofas, tables, compact kitchen appliances, TV, Wi-Fi, linens, amenities, etc.
• Total initial cost (estimate): Approx. ¥1.5 million–¥5.5 million

Case 2: Medium Vacant House (50㎡–100㎡ / Family-Sized House or Apartment)

• Target guests: Families, groups of friends (around 4–6 people)
• Renovation costs: ¥3,000,000–¥8,000,000. With more rooms, the interior construction area increases. Beyond plumbing, floor plan changes and insulation upgrades may also come into consideration.
• Licensing and fire safety equipment costs: ¥1,000,000–¥3,000,000+. As the total floor area increases, mandatory automatic fire alarm installation becomes more likely, significantly raising costs.
• Furniture, appliances, and supplies costs: ¥1,000,000–¥2,000,000. Multiple beds, a large dining table, sofa sets, family-sized kitchen appliances, a washing machine, and more—quantity and size scaled to capacity.
• Total initial cost (estimate): Approx. ¥5 million–¥13 million

Case 3: Large Vacant House (100㎡+ / Traditional Old Houses, etc.)

• Target guests: Large groups, three-generation families, corporate training retreats, etc.
• Renovation costs: ¥8,000,000–¥20,000,000+. For old traditional houses, seismic reinforcement, insulation upgrades, and a full plumbing overhaul are essential. Achieving modern comfort while preserving the building’s character requires advanced design and construction—costs can potentially be open-ended.
• Licensing and fire safety equipment costs: ¥2,000,000–¥5,000,000+. For large-scale facilities, fire code requirements become even stricter. Sprinkler system installation may be required.
• Furniture, appliances, and supplies costs: ¥1,500,000–¥3,000,000+. Enough beds for large groups, large-scale commercial-grade kitchen equipment, multiple bathrooms/toilets, and garden facilities (like BBQ equipment) should also be factored in.
• Total initial cost (estimate): Approx. ¥11.5 million–¥28 million+

Three Smart Strategies to Reduce Initial Costs

1. [Most Important] Make Full Use of Subsidies

Vacant-house utilization is a key policy priority for national and local governments. Numerous **non-repayable “vacant-house renovation subsidies”** are available, and it would be a shame not to take advantage of them. Some programs cover **one-half to two-thirds of renovation costs, up to several million yen**! Be sure to thoroughly research your local municipality’s website and apply before signing your construction contract.

2. Incorporate DIY Renovation

Tasks like wall painting, flooring, and simple furniture-building can be done yourself as DIY projects, significantly cutting labor costs. However, always hire licensed professionals for electrical and plumbing work that requires specialized qualifications.

3. Use Secondhand Furniture, Appliances, and Outlet Items

You don’t need to buy every piece of furniture and every appliance brand new. Smart use of recycle shops, flea market apps, and furniture outlet stores can significantly reduce your initial equipment investment. That said, never compromise on cleanliness.

Conclusion: Assess Cost-Effectiveness and Plan Meticulously

The initial cost of a vacant-house minpaku varies significantly depending on the property’s size and condition. What matters is calmly assessing your vacant house’s potential and your available budget, and adopting a cost-effectiveness mindset—**not just “how much will it cost,” but “how much return can this investment realistically generate.”**

And the foundation for that judgment is a precise, data-driven “business plan” and “revenue simulation.”

Let Our Professionals Assess That “Cost-Effectiveness” for You

“I want an accurate estimate of specifically how much this would cost for my vacant house.”

“I don’t really understand how to research subsidies or navigate the application process.”

“I’m worried whether the returns will really justify the initial investment…”

Please feel free to bring these concerns to us.

We at Stay Buddy Inc. are not just a minpaku management company. We are real estate utilization professionals who unlock the full potential of dormant properties and transform them into profitable “businesses.”

We will:

• ① Conduct a detailed hearing (or on-site survey) of your vacant house’s condition, and calculate the specific costs needed to convert it into a minpaku, itemized by category.
• ② Research applicable subsidy programs and propose the optimal funding plan to minimize your out-of-pocket costs.
• ③ Based on our extensive track record and data in the Osaka market, create a highly accurate revenue simulation to objectively assess whether your investment will deliver strong **”cost-effectiveness.”**

Let’s turn your vacant house project from a baseless gamble into a “business” with a high probability of success.

Ready to take that concrete, realistic first step together with us? We look forward to hearing from you.