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Mahachai Residence is a 180 m² day-use house beside Thailand’s Tha Chin River, shaped by the site’s former life as a boat-repair warehouse. Patara Architects carries that history into a compact riverside home through a long-span steel frame, visible building services, reused roof timber and distinct open and enclosed ways of meeting the water.
What is Mahachai Residence?
Mahachai Residence is a residential project in Samut Sakhon, Thailand. Patara Architects lists it as a 2025 project; ArchDaily also gives 2025 as the project year and reports a total area of 180 m². The architect and interior designer is Patara Architects, with Patara Warathanasin as lead architect. Project credits also name Arisan Co.,Ltd. as general contractor, Dechadoon Chiddee as civil consultant, Kraisit Prongseng as MEP consultant and tacophoto.bkk as photographer. Patara Architects’ portfolio and ArchDaily’s project listing provide the published project information.
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The project team describes the brief as a day-use villa for resting and taking in the river, rather than presenting it as a conventional full-time family home. Its layout responds to two different settings: an open, raised lower level connected to the pier and an upper living area oriented toward the river.
How did the former warehouse shape the design?
The site beside the Tha Chin River previously held the owner’s boat-repair warehouse, according to the project team’s description submitted to ArchDaily. That history informs both construction choices and the way the house uses the site. Timber reclaimed from the warehouse roof becomes a ground-floor swing and an upper-terrace bench, bringing material from the former building into everyday use.
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The project team also connects the warehouse’s practical character to the house’s structural and maintenance logic. The long-span steel frame creates open space, while plumbing, electrical wiring and ERV ducts remain accessible between the upper-floor beams. This is a design rationale described by the team, not evidence of measured maintenance savings or environmental performance. ArchDaily’s Spanish-language project description identifies the detailed text as submitted by the project team.
How does the structure create open space?
An entry courtyard leads into a steel structure with long-span I-beams spanning the site’s reported 14.4 m width. The project description says this arrangement opens two levels without columns, allowing the ground floor and upper level to read as broad, flexible spaces. The 14.4 m figure refers to the reported site width crossed by the structure; it is not a published span-performance test.
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At the upper floor, services run in the space between beams described as 70 cm deep. Leaving these systems exposed makes them reachable for maintenance and gives the ceiling a visibly infrastructural character rather than concealing everything behind a finished surface. The project description identifies the beam depth and service arrangement, but does not report construction cost, structural test results or quantified energy savings.
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Raised open ground floor
The lower level is a raised, open tai-toon—the space beneath traditional Thai riverside houses, as described by the project team. It extends domestic use toward the adjoining pier, making the water’s edge part of the house’s daily setting without treating the lower level as a fully enclosed room.
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River-facing living area and terrace
Upstairs, an open living area faces the Tha Chin River. The project team describes almost half of this level as an outdoor terrace. A perforated façade provides secondary shade from the western sun, while the river-facing glazing frames the view.
Why is the river-facing glazing fixed?
The project team says fixed glazing was chosen because odors from a neighboring fish-sauce factory make daytime ventilation from that side undesirable. This is a response to a specific local condition identified for Mahachai Residence, not a general recommendation for riverside houses. The project description does not provide indoor air-quality measurements or explain how ventilation performs under different operating conditions.
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What maintenance and climate features are documented?
Accessible services and ventilated roof
Plumbing, electrical wiring and ERV ducts are placed between the second-floor beams and left exposed for maintenance access. At the roof, a beam described as 60 cm deep creates a ventilated air channel between roof layers. These are documented design features and dimensions; the published record does not quantify their effect on cooling loads, energy use or indoor temperatures.
Independent stair structure
The blue stair is structurally independent of the main house, allowing its height to be adjusted as riverside soil settles, according to the project team. It is a project-specific response to the site conditions described, and the available project information does not state how often adjustment is expected or provide settlement monitoring data.
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What the published project record does—and does not—establish
The available project information documents the house’s brief, spatial organization, materials and several design dimensions. It does not establish construction cost, measured structural performance, quantified environmental results or post-occupancy outcomes. The architect’s website lists the project as 2025; ArchDaily gives the project area and credits, while its Spanish-language description supplies the detailed technical account attributed to the project team.
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