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Seseragi no Sato "Mansion in the Forest"
Relax in the light and greenery while surrounded by tranquility
Karuizawa Town Sengataki Villa Area
[Construction begins] Completion and delivery: End of July 2026
<< Location >>
Seseragi no Sato in Karuizawa Town is a quiet villa area surrounded by lush forests, close to Hoshino Onsen and Harunire Terrace. Enjoy the tranquil Karuizawa atmosphere, surrounded by the changing colors of the trees and the chirping of birds as the seasons change. There are many walking paths in the area, making it an ideal environment for spending a relaxing day in nature, whether walking your pet, reading, or gardening. Surrounded by the quiet forest, you can spend a peaceful time experiencing the changing seasons of Karuizawa.
<< Concept >>
We created a residence that exudes the warmth of nature, surrounded by the gentle shade of trees and where light and breezes circulate gently.
Taking advantage of the difference in elevation of the site, we planned a living room that is one step lower than the entrance. The slight step gives depth to the space and creates a comfortable space where the eyes naturally connect with the greenery of the garden. A large carport is installed on the north side of the road, and the main body of the building is set back to the south, blocking views from the street while ensuring a quiet private space. The facade is composed of staggered volumes, creating three-dimensional shadows and giving a sense of spaciousness that blends in with the nature of Karuizawa.
Surrounded by tranquility, you can let your mind free in the light and greenery - this is the embodiment of the comfort that is characteristic of Karuizawa.
Facilities and Features
Wood-burning stove (IronDog No. 4) / 1st floor floor heating / Air conditioning (living room and 3 bedrooms) / 1st and 2nd floor bathrooms / Natural materials used (solid mountain cherry wood flooring / diatomaceous earth interior walls) / Earthen floor salon / Open ceiling space / Walk-in closet / Countertop kitchen / IH cooking heater / Front-opening dishwasher / Microwave oven / Gas dryer "Kantakun" / Smart home equipment / Full furniture set / High-performance triple glazing / Long-term quality housing / Design performance evaluation certified / Covered carport for 2 cars
<< Nearby facilities of this property >>
Condominium prices
230 million yen
(tax included)
Floor plan
3LDK
Earthen floor salon + 2 carports
Site area
870.00 m2
263.17 tsubo
Building total floor area
228.75 m2
69.19 tsubo
Living
The living room, earthen floor salon, and void space were designed with vertical and horizontal connections in mind. The plan creates an open and comfortable space.
Kitchen・Dining
Enjoy your meal while feeling the nature of Karuizawa. The living room and dining room are connected to each other.
The stylish kitchen features a fully equipped kitchen space with a front-opening dishwasher, an electric oven range, storage space at the rear, and a housework space.
Dining space
A dedicated housework space is provided next to the storage area at the rear of the kitchen. It can also be used as a remote workspace.
Doma Salon
The space has a calming atmosphere, with floors made of chestnut wood from Shinshu, cypress planks, and an accent wall made of thick tiles.
Enjoy a relaxing time while watching the flames of the wood stove.
Second floor sub-living room
The sub-living room opens onto the outdoor balcony terrace. It is a luxurious space where you can feel the breeze, light, and Shinshu scenery.
bedroom
A spacious walk-in closet and ample storage space. From the north window, you can see the majestic Mount Asama, creating a relaxing space where you can enjoy the four seasons of Karuizawa.
Land area: 870.00㎡/263.17 tsubo
Floor plan: 3LDK + earthen floor salon + 2 carports
1st floor area: 136.01㎡ / 41.10 tsubo
2nd floor area: 57.96㎡ / 17.53 tsubo
Carport: 34.78m²/10.52 tsubo
Total: 228.75㎡ / 69.19 tsubo
[Planned site]
Address: 2139-499 Otanigasawa, Nagakura, Karuizawa-machi, Kitasaku-gun
Access: JR Karuizawa Station approx. 6.3km (15 minutes by car)
Shinano Railway Nakakaruizawa Station: Approx. 2.4km (6 minutes by car)
Property Description
Location: Planned site: 2139-499 Otanigasawa, Nagakura, Karuizawa-machi, Kitasaku-gun
Layout: 3LDK + Dirt-floored Salon + Carport
Price: ¥230,000,000 (tax included)
Land area: 870.00 m2 (263.17 tsubo)
Building Area: 228.75 m2 (69.19 tsubo) (1st floor: 136.01 m2 (approx. 41.1 tsubo), 2nd floor: 57.96 m2 (approx. 17.50 tsubo), Carport: 34.78 m2 (approx. 10.5 tsubo))
Transportation: JR Karuizawa Station: Approx. 6.3 km (15 minutes by car), Shinano Railway Nakakaruizawa Station: Approx. 2.4 km (6 minutes by car)
Structure: 2-story wooden frame building Airflow Construction Method
Land Category: Forest (Planned Land Category Change)
Zoning: Type 1 Low-Rise Residential District
Building Coverage Ratio: 30% (Due to the relaxed regulations for existing residential land)
Floor Area Ratio: 50% (Due to the relaxed regulations for existing residential land)
Building Approval Number: No. 25NJU-10-00121
Performance Certification: Long-Term Quality Housing Certification Notice/Design Performance Evaluation
Preferential Benefits: Eligible for Flat 35S (Type A Interest Rate), Earthquake Resistance Grade 3 Discount (Fire Insurance)
Amenities: Electricity, Private Water Supply, Septic Tank, Propane Gas
School District: Chubu Elementary School (2.1 km, 31 min. walk), Karuizawa Junior High School (2.8 km, 41 min. walk)
Private Road Fee: None
Road: Article 42, Paragraph 1, No. 3 Road (Private Road) Approximately 5.6m wide with approximately 17.3m of road frontage on the north side.
Other: Article 22 District, Nagano Prefecture Landscape Ordinance, Buffer Zone (Karuizawa Town Nature Conservation Measures Guidelines)
LandslLandslides: Not applicable
Floods: Not applicable
Building Setback: 5m road setback, 3m neighboring land setback, and 1/2 height
Current Status: Under Construction
Occupancy Date: End of July 2026
Other Fees: Water utility subscription fee of ¥220,000, registration fee for display and preservation registration,
optional villa management fee of ¥252,000 per year, Fixed asset tax settlement (starting date: April 1st)
Water Charge: Basic Rate ¥18,480/year + ¥401 per m3 of usage, meter usage fee ¥242/month
Seller: Forest Corporation
License Number: Nagano Prefectural Governor (1) No. 5812
Registered: November 26, 2025
Last Updated: November 26, 2025
Affiliated Organization: National Real Estate Transaction Business Guarantee Association
For a villa in Karuizawa, it is important to have sunlight and prevent humidity.
Karuizawa has a 90% chance of sunny days in winter!
Living at an altitude of 1,000m means sunlight is important
Good sunlight helps to combat the summer humidity and winter cold that are unique to Karuizawa. This allows moisture to escape, resulting in a dry home that prevents mold, and a warm home that doesn't rely on heating during the day in winter. With a location, layout, and insulation performance that allows sunlight to be efficiently absorbed, we offer homes that allow you to enjoy a warm winter life in Karuizawa, even without heating during the day.
The average annual humidity in Karuizawa is 80%!
Dense forests also make it difficult for the air to circulate.
The average annual humidity in Karuizawa is an astonishing 80% or more. The humidity is particularly high from June to October, creating an environment conducive to mold growth. During this season, a moldy smell can drift through vacation homes. Poor ventilation in the summer makes mold more likely to grow. This is why it's essential to take measures against humidity and mold in homes. Furthermore, sunlight doesn't reach the dense forest, so heating is necessary not only in winter, but also in spring, autumn, and day and night.
The "Airpass Solar Method" is suitable for the humid Karuizawa region.
Enjoy "warmth like sunshine" without worrying about humidity or condensation.
Airpass's winter mode lets the warm sun into the house and collects solar heat on the roof and walls, creating airflow within the walls. It completely envelops the house in a layer of warm air and is effective in preventing condensation and mold inside the walls caused by humidity. With an Airpass house, you can use it as a vacation home for long periods without worry! It protects your asset value for the long term.
