Long-Span Steel Structure Installed in Pattaya Villa Project

Marketing as Structure

By Thiti Teerachin (ธิติ ธีรชินทร์) · April 01, 2026

A private residential project in Pattaya has introduced an unusually long-span structural system within Thailand’s villa construction sector. Located at the Majestic Residence Village, the development combines cellular beams spanning 48 metres with steel box girders forming cantilevered sections of approximately 19 metres. Both elements exceed spans typically encountered in low-rise residential buildings.. Both elements exceed spans typically encountered in low-rise residential buildings.

The project was designed by Mario Kleff and executed under Wandeegroup Asia Co Ltd, with fabrication support from B.S.Y. Group PLC.

Structural Scope and Materials

Construction involved approximately 50 tonnes of fabricated structural steel. The system integrates large-scale steel elements, including the long-span cellular beam and cantilevered box girders, designed to support extended floor plates.

In conventional villa construction, structural spans typically range between 6 and 12 metres. Even in larger building types, spans beyond 20 metres are relatively uncommon. The 48-metre cellular beam used here therefore represents a substantial increase in span within a residential context, although extended spans have been explored in other projects in Thailand, as demonstrated in Sundiego Resort Villa Pattaya, where prestressed concrete girders of approximately 30 metres were implemented.

Cellular beams—steel beams with regularly spaced openings in the web—are commonly used to reduce weight while maintaining structural efficiency and allowing building services to pass through the structure (see Steel Construction Info guidance on Design of composite beams with large web openings.

Load Distribution and Structural System

The structural configuration is based on a central support arrangement, from which the box girders extend laterally in cantilevered sections of 19 metres. A cantilever allows a beam to project beyond its support without external bracing, transferring loads back to the primary support (see Encyclopaedia Britannica entry on cantilever structures).

Foundation and Substructure

The substructure comprises a deep foundation system with more than 100 piles, designed to anchor the building to underlying rock. Construction of the foundation, basement, and associated elements required approximately 700 cubic metres of high-strength concrete and around 100 tonnes of reinforcement steel.

These measures reflect the increased structural demands associated with long-span systems in a residential setting.

Design Implications

The extended span allows for large, uninterrupted internal spaces and wider façade openings than typically achievable in comparable villa developments. By reducing the number of vertical supports, the system enables greater flexibility in spatial planning and façade design.

Structural Architecture Context

Long-span steel systems are more commonly associated with commercial, industrial, or infrastructure projects due to their cost and fabrication complexity. Their application in private residential construction remains limited.

This project demonstrates how such structural methods can be adapted to a villa-scale development, indicating a selective shift towards more complex engineering solutions in Thailand’s high-end residential sector.