What decides the cost of building a villa on Koh Samui

Why "price per m²" misleads

Online figures mix very different villas: a flat plot or a steep hillside, basic tiles or imported stone, with or without a pool. A per-m² average can be off by half in either direction for your project. The only useful number is an estimate based on your plans.

The eight things that decide your cost

1. The plot. Slope, soil and road access. A steep or hard-to-reach site needs more excavation, retaining and transport.
2. Foundations. Their size follows the weight of the building and the ground beneath it.
3. Size and storeys. Floor area, and whether you build one storey or two.
4. Structure method. Steel, or concrete and block. This decides build time and foundation size.
5. Roof. Its shape, span and covering.
6. Finish level. Floors, kitchen, bathrooms, windows and doors. Often the biggest single variable.
7. Pool and external works. Pool, decks, driveway, walls and landscaping. These are often a quarter or more of the total.
8. Design, engineering and permits. Drawings, engineer sign-off and approval fees.

Where a steel frame saves

• Time. The frame stands in days, not months. Less rent paid elsewhere, less financing, earlier rental income.
• Foundations. A lighter structure needs smaller foundations, especially on hillside plots.
• Rework. Factory-cut studs to ±1 mm mean straight walls and less render, plaster and correction.
• Termite treatment. Not needed for the frame.
• Price certainty. Steel is priced and locked in the contract.

Where it doesn't

Steel doesn't change the cost of your pool, landscaping, kitchen or finishes. Those depend on your choices, whatever the frame.

How we price your project

1. Send your plans by WhatsApp: drawings, a sketch or a rough brief.
2. Get a budget estimate within 6 hours for your steel structure.
3. Refine it together: size, roof, finishes and scope.
4. Sign with the steel price locked in the contract.