Home Tour: a private gallery villa in Khao Yai, like a Pandora’s box of masterpieces

Given Onion’s reputation for crafting masterstrokes across boutique hospitality and luxury retail spaces, their decision to take on a private residential commission naturally sparked our curiosity about the home’s origin story.

“Designing a private residence was perhaps our single greatest challenge, simply because we rarely accept home commissions—our portfolio consists mostly of public spaces,” Siriyot reflects. “When we committed to this project, it demanded a deep dive into the nuanced details and personal character of the owner, making it an extraordinarily demanding yet inspiring process.”

For Khaoyai House, the practice distilled the elevated sensibilities of high-end resort architecture into an intimate, personal scale. The resulting structure acts much like a metaphorical “Pandora’s Box”—curated, calm, and understated on the outside, yet revealing a captivating layer of spatial play, emotional shifts, and theatrical details at every turn within.

Driven by the owner’s passion for contemporary art and informed by a deep familiarity with luxury hospitality, the brief gave Onion complete creative freedom to set the architectural narrative.

Rather than adopting a conventional holiday home layout, the architects conceived the floor plan as a living gallery surrounding a central courtyard. Circulation corridors double as exhibition spaces, weaving the collection into daily rituals.

“The owner is an avid art collector, so we anchored the concept around a gallery loop enclosing the main drop-off court,” explains Siriyot. This layout establishes an unmistakable identity from the moment an automobile arrives, guiding visitors along an art-filled procession before they ever step inside.

The two-storey structure conceals a subterranean fitness studio while dispersing four guest suites across the upper and lower levels. A glasshouse-style suite extends across the ground floor, while the upper bedrooms face mountain horizons. Anchored by the central arrival drop-off, the layout divides cleanly into two wings: a semi-outdoor hearth room leads to the primary lounge on the right, while the left wing opens into a formal 14-seat dining hall.

Spatial planning relies heavily on emotional zoning. While the exterior maintains a crisp modern silhouette, interior spaces deliver dramatic shifts in mood and tone.

“We wanted every room to share a subtle family resemblance, yet evoke entirely distinct feelings upon entry,” Siriyot observes. The primary lounge is finished in ethereal monochrome whites, evoking the weightless sensation of floating among clouds. Conversely, the dining hall adopts dark, moody tones to foster an intimate, semi-formal atmosphere.

Deep within the private quarters, the element of surprise continues. The primary suite features a bold black bed leading into an open-plan bath area, complete with a freestanding tub that overlooks the green expanse of a nearby golf course.

Meanwhile, a ground-floor suite echoes the feel of an airy glass conservatory, enveloped by glass on three sides beneath rustic batten timber ceilings. In selecting secondary finishes, the team introduced whimsical touches—such as circular vanity mirrors that echo the recurring architectural arches.

Fluid movement is central to the design. Free from rigid pathways, residents and guests can choose between entering through the formal drop-off or taking a discreet side gate directly into the dining room, offering varied sensory experiences throughout the day.

Visual axes connect distinct zones seamlessly. Even when privacy is required, full-height sliding glass doors can be drawn open to establish an unbroken line of sight across the entire estate.

Interior designer Vichada Sitakalin joined forces with Onion to curate furnishings and soft goods. The interior scheme relies on tactile contrasts, pairing quiet luxury with raw, natural textures.

In the central courtyard, small-scale marble tiles break up the monochromatic architecture. Mediterranean-style arches line the walkways, casting dynamic shadow patterns as the sun moves across the sky. To maintain stylistic continuity reminiscent of fine hotels, the fluted ceiling details from the living room are scaled down and echoed along the stairwells.

Material selections directly mirror each room's intended mood. While the main living lounge remains pristine and white, the dining room embraces dark shou sugi ban charred pine walls paired with warm oak flooring. Custom bell-shaped lamps, hand-cast by local Thai artisans, hang above the dining table to soften the space.

Tactile finishes extend to the outdoor pool area, where hand-rubbed rustic teak ceilings celebrate natural wood grain. “The villa balances two distinct personalities—one tailored and precise, the other raw and handcrafted,” Siriyot notes.

This handcrafted sensibility is evident in the semi-outdoor hearth, where hand-plastered concrete forms curved benches around the fire pit. Roll-up bamboo blinds introduce a nostalgic, vernacular touch rarely seen in modern villas, blending into the mountain context.

Beyond visual appeal, the home caters to daily living rituals. Semi-outdoor sunbeds along the pool evoke the relaxed atmosphere of a boutique resort lounge, while dual fire pits—gas and real wood-burning—offer choices for cool evening gatherings.

“At night, residents can soak in the warm tub and watch the open flames across the pool,” says Siriyot. Lighting design eschews harsh spotlights, relying instead on indirect illumination washing from the corridors to create a soft, ambient glow after dark.

Read more: Home Tour: Inside Baan Arkard Yen, a mid-century sanctuary built for cool breezes and quiet leisure

Site sensitivity guided the master plan. All four bedrooms face mountain views, arranged around an existing mature tamarind tree preserved during construction.

The landscape scheme incorporates seasonal botanical displays—pink blooms along the western edge, yellow flora in adjacent zones—allowing the grounds to transform organically throughout the year.

Light and shadow dance across the white plaster throughout the day. Slotted corridor apertures paired with woven bamboo blinds cast changing geometric shadow patterns across the gallery walls.

Reflecting on the project, the architects note that private residential briefs present unique complexities compared to commercial spaces, requiring a delicate balance of individual tastes within a single household.

“Designing for a family of five meant harmonising distinct preferences,” Siriyot explains. “Thanks to the client’s trust, we maintained a strong, cohesive design vision.”

For Onion, the central drop-off courtyard remains the ultimate highlight—a space where indoor and outdoor environments dissolve, offering an unforgettable arrival experience before unlocking this private sanctuary.

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