What Is a Marriott Room Block
A Marriott room block is a pre-reserved set of guest rooms held for a group at one of the Marriott Bonvoy brands for a specific event date range. The block is negotiated in advance, and the hotel guarantees availability under the terms of the group contract. Blocks are commonly used for corporate conferences, trade shows, weddings, and association meetings. The room rate is typically offered below the best available public rate for the same dates. Marriott Bonvoy properties include brands such as Sheraton, Westin, W Hotels, and The Ritz-Carlton (source).
Group booking rules require a minimum number of room nights, often tied to the total sleeping room count in the hotel. Marriott uses a block master to track reservations, cancellations, and rooming lists. The contract specifies cut-off dates, attrition thresholds, and cancellation penalties. Attrition clauses release the group if a certain percentage of rooms go unbooked. Some blocks include complimentary rooms or meeting space based on the total room nights committed (source).
How Marriott Room Block Pricing Works
Group Rate Structure
Marriott group rates are quoted as a percentage below the hotel's prevailing public rate or as a fixed dollar amount per night. The rate is usually guaranteed for the full block period, even if the group books fewer rooms. Taxes, resort fees, and incidental deposits are listed separately in the contract. Marriott Bonvoy loyalty points may be earned or redeemed on group block rooms, depending on the reservation type. The final rate depends on the property's occupancy forecast, the size of the block, and the length of the event (source).
Attrition and Cancellation Terms
Attrition clauses define the minimum number of room nights the group must sell to avoid penalties. Common thresholds are 80 to 90 percent of the blocked rooms. If the group falls below the threshold, the penalty is calculated on the difference between the guaranteed room nights and the actual room nights. Cancellation terms vary by property and brand. Some Marriott contracts allow free cancellation up to a specified date before arrival. The contract also sets the cut-off date by which the group must submit its final rooming list (source).
Best Practices for Booking a Marriott Room Block
Negotiation and Contract Review
Effective negotiation starts with a clear estimate of expected attendance and rooming needs. Planners should request attrition flexibility, complimentary room blocks for speakers or VIPs, and waived cancellation fees where possible. Reviewing the contract for hidden fees, such as mandatory service charges or early booking deposits, is essential. Marriott sales teams can provide historical occupancy data for the property to support forecasting. The final contract should align the room block with the event timeline and budget constraints (source).
Managing the Rooming List
A rooming list is