Building Height & Beach Setback Rules on Koh Samui
One of the first questions any serious buyer asks on Koh Samui is a simple one: how high can you build, and how close to the sea? The answer shapes everything — the view you keep, the density around you, and whether the villa next door can ever rise up and block your horizon. It is also one of the most misunderstood parts of buying here.
This is an overview of how the rules work. It is written to help you ask the right questions, not to replace professional advice — the exact figures for any specific plot must always be confirmed against the current regulations and with the local authority (the Tessaban / municipal office) and a licensed architect.
Why Koh Samui has its own rules
Unlike much of Thailand, Koh Samui is designated an environmentally protected area under a notification of the Ministry of Natural Resources and Environment. On top of the national Building Control Act, this designation adds island-specific limits on how tall you can build, how much of a plot you can cover, and how development steps back from the coast and up the hillsides.
The single most important idea to understand is this: on Koh Samui, permitted height is tied to how high your land sits above sea level. The higher up the hill you go, the lower and lighter you are allowed to build.
Height by elevation — the three tiers
Building rights are broadly divided into three elevation bands, measured as height of the land above mean sea level:
- Below ~80 m above sea level — the most permissive zone. Buildings are limited to around 12 m in height (roughly three storeys), with generous but capped ground coverage. This is where the majority of villa development sits.
- ~80 m to ~140 m above sea level — significantly tighter. Height drops to around 6 m (effectively single-storey), building coverage is heavily restricted, and a larger share of the plot must be left as green/open space.
- Above ~140 m above sea level — the conservation zone. Construction is, in practice, prohibited to protect the ridgelines and forest.
These thresholds are why two neighbouring plots on the same hillside can carry very different building rights: what matters is the elevation of the land itself, not the size of the plot alone.
The practical takeaway: elevation is both a constraint and a form of protection. Land just above you, higher up the slope, is limited to lower, lighter building — which is part of what keeps a view open over time.
The shoreline setback
Separately from the height tiers, development near the water must respect a setback of 50 m from the shoreline — a strip of land closest to the sea, measured from the shoreline / mean high-water line, within which building is restricted or prohibited. Along the beach itself, additional distance and height restrictions apply so that structures do not crowd or overshadow the coast.
For an oceanfront or sea-view plot this cuts two ways:
- It limits how close to the water any structure — yours or a neighbour’s — can be placed.
- Combined with the elevation rules, it is a large part of why sightlines toward the sea on a well-positioned hillside plot are so durable.
Where KIRIVA sits
KIRIVA was planned around these rules rather than against them.
The site sits below 80 m above mean sea level — inside the most permissive elevation band, the one that carries the standard height and coverage allowance rather than the restricted single-storey limits that begin higher up the slope. And it sits entirely outside the 50 m shoreline setback, so no part of the development stands in the protected coastal strip.
The third piece is the land itself. The villas are laid out along the site’s natural contour lines, each one stepping down the slope below the one behind it. Because the plots are staggered by elevation rather than sitting side by side on a single level, no villa is built in the line of sight of another: every house looks out over the roof of the one below, and no neighbour can rise into your view. That is a function of the topography and the site plan, not of goodwill between owners — which is what makes it hold.
Before you buy — a short checklist
- Confirm the exact elevation of the specific plot, not just the general area.
- Ask which elevation tier the plot falls into and the resulting height and coverage limits in writing.
- Check the 50 m shoreline setback and any beach-zone restrictions that apply.
- Verify the plot’s land title and that the intended building envelope has a realistic path to permits.
- Have all of the above reviewed by a licensed local architect and a lawyer before committing.
Regulations are periodically revised and are applied plot-by-plot, so treat every figure above as a framework to check — never as a guarantee for a particular piece of land.
This article is general information about development on Koh Samui and is not legal or professional advice. For guidance on a specific plot, or to understand how these rules shape the KIRIVA site, get in touch.