The conceptual framework of the Vanillin Haus Hotel is structured around two interconnected design systems: (1) Functional and Spatial Planning and (2) Experiential and Sensory Design. These systems operate in parallel to address both the physical constraints of the site and the creation of a distinctive guest experience.

1. Functional and Spatial Planning
   The first design system responds to the physical constraints of the project. As the hotel occupies a relatively compact and narrow elongated building footprint, the interior planning focuses on efficient spatial organization while accommodating the essential furniture, facilities, and functional requirements expected of a four-star-level hotel experience. Particular attention is given to furniture layouts, circulation, functional clearances, and usable space to ensure that spatial limitations do not compromise guest comfort or quality of use. This framework therefore explores how a compact three-star hotel can maximize spatial efficiency while delivering an ambience and functional experience comparable to a higher-category hotel.
2. Experiential and Sensory Design
   The second design system establishes the conceptual and experiential identity of the hotel. Inspired by the name Vanillin Haus, the design interprets the sensory and emotional qualities associated with vanilla and vanillin, including warmth, softness, comfort, tranquility, and refined luxury. These qualities are translated into the central design concept, “The Scent of Warm Luxury.”
   The concept is further developed as a sequential Sensory Journey, in which different areas engage guests through distinct sensory experiences:“Scent → Taste → Sight → Touch” corresponds to
   “Lobby → Restaurant → Wellness → Guestrooms”The journey begins with scent upon entering the hotel, followed by taste in the restaurant, sight within the wellness environment, and touch in the guestrooms. These experiences are translated into spatial atmosphere, materiality, form, lighting, landscape, furniture, and interior details, creating a coherent and immersive guest experience.

The integration of these two design systems establishes the overall conceptual framework of the project. While Functional and Spatial Planning addresses the efficiency and usability of a constrained footprint, Experiential and Sensory Design creates the project’s distinctive identity and emotional experience. Together, they demonstrate how spatial efficiency and sensory-driven design can be integrated to enhance the perceived quality and experiential value of a compact urban hotel.

This creative design project employs a design-based methodology to develop the interior and spatial design of Vanillin Haus, a compact urban hotel in Sukhumvit 81, Bangkok. The methodology integrates functional and spatial planning with experiential and sensory design to address the physical constraints of the building while creating a distinctive hospitality experience. The design process consists of four sequential stages.

1. Site and Spatial Constraint Analysis
   The first stage analyses the existing architectural conditions and spatial constraints of the project. Particular attention is given to the compact, narrow, and elongated building configuration, available floor area, circulation, functional requirements, and usable space. The analysis identifies spatial limitations and opportunities that may affect guest comfort, operational efficiency, and the overall quality of the hotel environment. The findings establish the spatial requirements and priorities for subsequent design development.
2. Functional and Spatial Planning
   The second stage develops spatial planning strategies based on the identified constraints and requirements. Major functional areas, including the lobby, restaurant, wellness facilities, guestrooms, and back-of-house areas, are organized according to their functional relationships and circulation requirements. Furniture layouts, circulation routes, functional clearances, and space utilization are developed with reference to the spatial requirements of four-star hotel environments. Alternative layouts are explored to maximize spatial efficiency while maintaining usability, comfort, and appropriate separation between guest and service functions.
3. Conceptual and Sensory Design Development
   The third stage establishes the experiential identity of the hotel through the concept “The Scent of Warm Luxury.” The sensory and emotional qualities associated with vanilla including warmth, softness, comfort, tranquility, and refined luxury are translated into a sequential Sensory Journey: Scent → Taste → Sight → Touch. These sensory dimensions correspond to four primary zones: Lobby, Restaurant, Wellness, and Guestrooms. Each zone is developed through spatial atmosphere, form, materiality, color, lighting, landscape, furniture, and interior details.
4. Design Integration and Evaluation
   The final stage integrates the functional, spatial, and sensory design components into a coherent interior proposal. The design is evaluated according to spatial efficiency, functional usability, guest comfort, conceptual consistency, and sensory experience. The evaluation considers whether the proposed design can accommodate the required hotel functions within the limited building footprint while maintaining the intended design quality and creating a coherent guest journey. The design is subsequently refined to strengthen the relationship between functional performance and experiential quality.