BOI OSOS.

BOI OSOS at a glance

The One Start One Stop Investment Center (OSOS) has operated since November 2009 as a joint BOI-led service bringing together staff from multiple investment-related government agencies under one roof, so BOI-promoted companies and investors can handle registration, licensing and related approvals without visiting each agency separately.

It sits on the 18th floor of the Chamchuri Square Building at the corner of Phayathai and Rama IV roads in Pathumwan, directly above the Sam Yan MRT station, making it one of the more accessible government service points for anyone already living or working in central Bangkok.

Address: 18th Floor, Chamchuri Square Building, 319 Phayathai Road, Pathumwan, Bangkok 10330
Hours: Mon–Fri 8:30am–12:00pm and 1:00pm–4:30pm; closed weekends and official holidays
Nearest station: Sam Yan (MRT Blue Line) — Chamchuri Square sits directly at the station

What's handled here

• BOI investment promotion applications
• Foreign business licensing coordination
• Work permits and visas for BOI-promoted companies (via the co-located One Stop Service Center)
• Company registration coordination for promoted investors

Notable facts

• OSOS primarily serves BOI-promoted businesses and their foreign staff, including coordinating visas and work permits through the co-located One Stop Service Center for Visas and Work Permits — a different track from the standard visa-extension process most retirees and non-working expats use at Chaeng Wattana.
• Central Pathumwan location beside Sam Yan MRT puts it within easy reach of the Silom, Sathorn and Siam business districts.

Sources & References

• Immigration Bureau, Royal Thai Police
• Department of Livestock Development (DLD), Thailand

Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.