SERVICES

Private Residences

Designing a residence means creating a space that reflects each client’s unique way of living.
Every home differs depending on lifestyle, site conditions, and personal preferences, while also requiring universal qualities such as structural safety, environmental performance, and durability. At KEY OPERATION, we combine these essential aspects with refined design, ensuring long-term comfort, sustainability, and enduring value. We aim to create homes that not only express individuality but also grow with time, offering both elegance and functionality.

+Design Process

1. Initial Meeting
We listen to your needs, site conditions, budget, and schedule. (Free of charge)

2. Concept Design (from 2 months)
Site study, regulatory review, and initial proposals with drawings and renderings.
Fee: from JPY 3,000,000 (depending on scale and complexity)
Deducted from the full design fee if you proceed with a contract.

3. Schematic Design (from 3 months)
Developing the selected concept into clear plans and elevations.

4. Detailed Design (from 4 months)
Finalizing specifications and preparing construction drawings.

5. Building Approval (from 2 months)
Submission to authorities, including structural review where required.

6. Contractor Bidding (from 1 month)
Obtaining and reviewing bids to select a contractor.

7. Construction & Supervision (from 10 months)
Regular site supervision to confirm quality and progress.

8. Completion & Handover
Final inspections and handover with the client.

9. Post-Occupancy Care
Follow-up inspections after 1 and 2 years.

+Construction Cost Guideline

  • Wooden houses: approx. JPY 2,000,000 per tsubo (3.3 m²)～

  • Reinforced concrete houses: approx. JPY 3,000,000 per tsubo～

(Depending on site conditions, specifications, and scale)

+Design Fee

  • Fees are calculated based on the required work volume according to the project’s scale, complexity, and conditions.

  • As a reference, residential projects often range around 10–15% of construction cost.

  • Minimum fee: JPY 8,000,000 (excl. tax) for new residences.

  • Additional costs: site survey, soil investigation, application fees, travel expenses for remote projects

 

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