Four extension projects are in progress across four countries, and they are a great example of how differently hotel groups approach the same basic move: adding rooms to a property that already exists. In London, Hilton is planning a 501-room addition to its Olympia property. In the Netherlands, Hotel Spier Dwingeloo is already under construction, with a 2028 opening targeted. Grapevine, Texas, is getting more rooms at Hotel Vin, Autograph Collection, a 120-room extension due in 2027. Sydney’s Shelbourne Hotel will offer 140 rooms in planning but no confirmed opening date yet.

What connects them isn’t geography but that all four are extension projects, adding capacity to existing properties rather than building from the ground up. Star ratings and stages vary—from already under construction to still in planning—but each represents an established property adding rooms or facilities. The details below were pulled from the THP database, where extension projects across every major brand are tracked continuously. These four represent a fraction of what’s in there.

Hilton London Olympia

• Location: London, England
• Construction Status: Planning
• Expected Opening Date: tba
• Construction Type: Extension
• Stars: 5
• Number of Rooms: 501
• Group: Hilton Hotels & Resorts | Hilton Worldwide

Hotel Spier Dwingeloo

• Location: Spier, Netherlands
• Construction Status: Under Construction
• Expected Opening Date: 2028 Q4
• Construction Type: Extension
• Stars: 4
• Number of Rooms: 110
• Group: Van der Valk Hotels & Restaurants | Van der Valk Group

Hotel Vin, Autograph Collection

• Location: Grapevine, Texas, United States
• Construction Status: Under Construction
• Expected Opening Date: 2027
• Construction Type: Extension
• Stars: 5
• Number of Rooms: 120
• Developer: Coury Hospitality
• Group: Autograph Collection | Marriott International, Inc.

Shelbourne Hotel

• Location: Sydney, Australia
• Construction Status: Planning
• Expected Opening Date: tba
• Construction Type: Extension
• Stars: 4
• Number of Rooms: 140
• Architect: Bates Smart

What This Means for Suppliers

Extensions run on a different procurement timeline than new builds. Furniture, fixtures, and equipment often need to match what’s already installed, which narrows the supplier selection compared to a ground-up project where specs are set from scratch. Of the four projects tracked here, Hotel Spier Dwingeloo is the one to watch first, since it’s already under construction and closest to placing orders. The other three, in London, Texas, and Sydney, are still in planning, meaning contracts and supplier decisions are still ahead.

The THP database tracks these details as projects develop, including contractor and supplier information as it becomes available. That gives vendors a way to see extension projects before they reach the bidding stage. With three of the four properties still in planning, there’s a window for suppliers to get in early, before contracts go out and decisions are harder to influence.