Anantara Siam Bangkok Opens 335 Renovated Rooms to Book

Anantara Siam Bangkok Hotel completed a USD 50 million transformation of all 335 guestrooms, suites, and villas, Anantara Hotels and Resorts said in a September 9, 2026 statement distributed through PR Newswire. Hotel News Resource reported the same day that the rebuild also covers meeting rooms, the spa, and fitness areas at the Ratchadamri landmark, which opened in 1983 to a design by hotel architect George Wimberley.

If you are choosing a Bangkok hotel for the next few months, the practical change is that the rebuilt inventory is now in the booking mix, including Garden Pool Suites with private pools and the two-bedroom Jim Thompson Explorer Suite. Place those nights against temple, market, and river days with our guide to things to do in Bangkok, because the hotel sits in the same central shopping and park core around Rajadamri Road.

All 335 Rooms Are Back in the Booking Mix

The hotel says every Deluxe Room, Siam Suite, Anantara Suite, and the Presidential Suite has been rebuilt with teak, silk accents, and marble bathrooms. Breaking Travel News, working from a hotel briefing published September 11, put the Thai-baht figure at more than THB 1.6 billion, which matches the USD 50 million figure in the English release. That is the number to use when you compare this stay with other rebuilt city hotels, not a nightly rate, which the hotel did not publish in the announcement.

General Manager Torsten Richter called the project a new chapter for a property that has anchored luxury stays in Bangkok for more than four decades. He pointed to the Global Tourism City Attractiveness Index 2026, which ranked Bangkok eighth among 200 cities, as the demand backdrop for the spend. The claim to weigh as a guest is simpler: the rooms you book now are the post-rebuild rooms, not a wing that is still under wraps.

Garden Pool Suites Put a Resort Stay on Rajadamri Road

The standout new product is the Anantara Garden Pool Suites and Villas, set in the hotel’s tropical gardens with private pools and indoor-outdoor living in the middle of the city. Minor Hotels’ July 2025 plan said six Garden Suites with plunge pools would arrive in the second phase, which ran from May to September 2026. If a quiet pool is the reason you are skipping a riverside resort, this is the category to request first.

The Jim Thompson Explorer Suite is a two-bedroom unit done with Thailand’s silk house, with teak floors, painted paneled walls, an open living and dining room, and a private library. Book that key if you need space for a family or a longer city trip rather than a standard king. It is a collaboration product, not a museum stay, so treat the silk and artwork as the design story rather than a ticketed exhibit.

Dining, Spa, and the Ballroom Stayed on the Property

Nine restaurants and bars remain on site, including Spice Market for Thai cooking, Biscotti for Italian, Shintaro for Japanese, Madison Steak Avenue, Guilty Bangkok for South American cooking, and Aqua Bar, which the hotel says sits on the Asia’s 50 Best Bars list. Mocha and Muffins, afternoon tea in The Lobby, and The Garden Terrace by the pool round out the list. You do not have to leave the grounds for a full dining day, which matters if you are in town on a short layover.

The Anantara Spa was rebuilt around Thai healing treatments. The Siam Sports Club now has a Technogym gym, a Pilates studio, and an outdoor zone with a Muay Thai ring, a climbing wall, and functional training. The Grand Ballroom and meeting rooms were redesigned with new event technology for conferences and weddings. If you are staging a celebration, ask the hotel which ballroom dates are already held, because the September notice confirms the rooms are finished, not that every weekend is open.

Two Phases Kept Guests in House Through 2026

Minor Hotels said in July 2025 that the hotel would stay open, with all dining venues and upper-level function spaces running through both phases. Phase one, through November 2025, covered Montathip and Kannika Court rooms, Garden Terrace Rooms, the Kasara Lounge, the pool, the fitness center, and some ground-floor meeting space. Guests checking in during that window were already using rebuilt rooms in those courts while later public spaces were still in the second phase.

Phase two, from May to September 2026, covered Garden Pool Villas, Parichart Court rooms, Spice Market, the Kids Club, the grand lobby, the ballroom, and remaining event space. REm Magazine reported the same two-phase calendar in September 2025 and traced the building’s earlier life as The Regent Bangkok and, later, Four Seasons Hotel Bangkok before the Anantara name arrived in 2015. The 100-metre lobby mural by Paiboon Suwannakudt and 19 ceiling panels titled Heavens in Thai Thought were conserved rather than replaced, the September 9 release said.

Booking the Rebuilt Anantara Siam in Bangkok

Direct booking is through the Anantara Siam Bangkok hotel site. Guests in Minor DISCOVERY, which sits inside GHA DISCOVERY, should see the stay credited as they would at other Anantara hotels. Another new Bangkok luxury stay on a later timeline is The Langham, Custom House, which opened reservations for December 20 stays. Anantara is the one you can book now for a rebuilt in-town garden hotel rather than a December debut.

If you want a museum morning after breakfast, the Bangkok National Museum visitor guide is the closest Deep Arrival culture page to this stretch of the city. The hotel did not publish a special renovation rate in the September notice, so compare the live Anantara price with other Pathum Wan hotels on your dates instead of waiting for a launch code that has not been announced.