Two riverside plots of identical area can be worth very different amounts, because of how much of each touches the water. Why that is, and how to compare them properly.
On ordinary land, area is the number that matters most. On waterfront land it is not.
Two plots, each one rai — 1,600 square metres.
The price per square metre may be identical in the listing. They are not the same product.
Plot A can take a house turned fully to the water, with every principal room facing it. Plot B is a narrow strip: few rooms can see the water, and most of the area sits back from it, where it is no different from ordinary land.
The more useful comparison is price per metre of water frontage.
If both plots are 12 million baht:
That figure says what price per square metre cannot.
This site shows price per metre of frontage alongside price per square wah on every listing that records a frontage.
Views and house planning. A house that can turn its full width to the water resells better, consistently.
Jetties and water access. Narrow frontage limits what can be built at the water's edge, and setbacks from the neighbouring boundaries eat into it further.
Setbacks. The setback from the water consumes depth, not width. A shallow plot loses a greater proportion of its usable area to it.
Privacy. A narrow plot puts the house close to neighbours on both sides, which runs against the reason most people buy waterfront in the first place.
More frontage is not automatically better. A deep plot suits a buyer who:
The point is not that one shape is better. It is that the two should not be priced off the same number.
When looking at a waterfront listing, ask for the water frontage in metres. If the listing does not state it, that is missing information rather than a minor detail.
And measure it on site. The figure on the deed and the ground can differ after years of erosion or accretion.
Waterfront land carries building restrictions ordinary land does not: setbacks from the water, Marine Department permits, and zoning. What to establish before paying for a design.
A single plot carries at least two prices. The Land Department's assessed value sets the taxes; the market price is what it changes hands for. Knowing which is which keeps the sums right.
The annual tax is set by how the land is used, not by value alone. Land left vacant is taxed at the highest rate, and the rate climbs every three years.
