Documented cluster · Phra Nakhon

Tha Tien market blocks

กลุ่มตึกแถวท่าเตียน

5 candidate footprints, 0.2% of the 2,433-building spine. Evidence tier counted — Units counted in a published survey. Somebody has been here with a clipboard — but nothing is legally protected.

The dimensions actually measured

Footprints screened: 5morphology only, never surveyed
Median frontage: 11.1 mcitywide 5.1 m
Median depth: 24.6 mcitywide 13.6 m
Deepest tenth: 35 mp90 · citywide 27.6 m

Frontage and depth are the short and long sides of each footprint's minimum-area bounding rectangle, computed by scripts/build-shophouse-spine.py over the Overture/OSM screen. A footprint in this set has not been visited: the shape says shophouse, and nothing here says it is one.

Against those 5 screened shapes, a published survey counted 490 units here. Where the two disagree, the counted figure is the one a human stood in front of.

What binds these buildings

Computed per footprint from depth, plot and neighbours — not merely listed. A clause counts as binding when this building's own geometry triggers it.

MR55 ข้อ 24 of 5
Each คูหา: width ≥ 4 m (column centreline to centreline); depth ≥ 4 m and ≤ 24 m; ground-floor area ≥ 30 m². If depth exceeds 16 m, an uncovered void of ≥ 10% of ground-floor area between 12 and 16 m depth.
The 4 m module is a floor set by law. Tirapas's surveyed 4 m module is the regulation made visible.

Already over the depth cap: 3deeper than the 24 m ข้อ 2 allows a new build
Median row length: 1 unitsข้อ 4 caps a continuous row at 10
Rows over that cap: 0lawful when built, unbuildable now

The interesting number is the third. Where a row exceeds today's cap, the building standing there could not be built again — which means demolition is not a reversible decision, whatever replaces it.

Where the pressure sits

Each footprint is placed on two axes: the appraised land value underneath it, split at the citywide median of ฿3,568,750, and its plot depth, split at 13.6 m — below which a 2 m setback takes a serious share of any compliant replacement.

Genuinely exposed5
High land value, deeper plot.
The land is worth enough to justify clearing and the plot is deep enough to absorb a setback. On present rules these are the ones that go, and an argument for keeping them has to be made on carbon, tenure or social capital rather than on the code.

Land under one footprint: ฿17,531,250median · citywide split ฿3,568,750
District appraisal band: ฿62,500–฿250,000per m², Treasury appraisal

Appraised value is the base for transfer tax and sits below market, so every figure here is a floor, not an estimate.

What this page cannot tell you

Storeys are known for 0 of the 5 footprints here — 5 carry none, and are left null rather than filled with a plausible number. Across the whole spine the same is true of storeys (for two-thirds of the set), tenure, structural condition, road width, build year.

Morphology is not proof. A narrow, deep footprint repeating along a street is the shophouse signature, but no field survey has confirmed that any individual building here is one, nor its age, condition or tenure.
Appraised value is the base for transfer tax and sits below market, so every land figure is a floor rather than an estimate.
The setback exposure assumes a road width, because per-plot road widths are not published — the assumption is stated in SPLITS and can be changed.

Where this comes from

Not one building: 490 shop units, a market and a river landing working as a single urban instrument. The smell, wholesale trade and ferry rhythm are part of the heritage—not noise around it.

Market-and-pier shophouse ensemble

Period: Late 19th century onward
Kind: market row
District: Phra Nakhon

Documentation: Journal of Cultural Geography / Tha Tien study ↗. Every computed figure on this page comes from scripts/build-shophouse-spine.py, which states each rule in its header.

Arkara, N. (2026). Tha Tien market blocks — documented shophouse cluster (5 screened footprints) [Data set]. Shophouse Metropolis, BKKx. https://shophouses.nonarkara.org/shophouses/cluster/tha-tien

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