What is an Attrition Clause in a Hotel Block?

An attrition clause is a term in a hotel room block contract that requires you to fill a minimum percentage of the rooms you’ve reserved. If your guests don’t book enough rooms by the deadline, you’ll need to pay a fee to cover the hotel’s lost revenue from the unused rooms. Most contracts set the minimum between 75% and 90% of the total block.

How an Attrition Clause Works

When you sign a room block agreement with a hotel, they’ll reserve a set number of rooms for you at a special rate. In exchange, the hotel expects a certain number of rooms to be booked. The attrition clause spells out this expectation clearly. It sets a minimum booking rate—usually as a percentage—and explains what happens if you don’t meet that number.

This clause works together with your room block cutoff date. After the cutoff, the hotel will tally up how many rooms were actually booked. If you didn’t meet the minimum agreed, you’ll have to pay an attrition penalty. The hotel will bill you for the difference between the required minimum and the actual rooms booked.

Why the Attrition Clause Matters for Weddings

Wedding room blocks usually involve booking 10 to 50 or more rooms over one or two nights, which is significant revenue for the hotel. The attrition clause protects the hotel from holding rooms that end up unsold. For you, it could mean a financial liability ranging from a few hundred to several thousand dollars if not enough rooms are booked.

Understanding the clause before you sign lets you right-size your block. Overestimating how many guests will book rooms is the most common reason couples face attrition charges. A realistic headcount—based on your guests’ travel patterns and your venue location—reduces the risk of paying for unused rooms.

Common Attrition Rates and Penalty Structures

Hotels handle attrition penalties in a few ways:

Percentage-based threshold. This is the most common. You’ll need to fill 80 percent (or another agreed figure) of your room block. Penalties only apply to the difference between the threshold and your actual bookings, not every unfilled room.
Revenue-based calculation. The penalty is based on the lost room revenue for each unfilled room below the threshold. Some contracts also include taxes, resort fees, or estimated extra spending.
Sliding scale. A few hotels use tiered penalties: you pay less if you fill 70 to 79 percent, but more if you drop below 70 percent.
Resell credit. Some contracts state that if the hotel resells an attrition room to a walk-in guest, that room no longer counts against your shortfall.

Always check with the hotel and clarify exactly which charges are included in the penalty calculation before you confirm the agreement.

Tips for Negotiating a Favourable Attrition Clause

You may have more bargaining power than you realise, especially during off-peak periods or at hotels keen to host wedding groups. Consider these strategies:

Lower the threshold. Ask the hotel to reduce the required fill rate from 80 percent to 70 percent. Even a small reduction can save you hundreds if a few guests change their plans.
Request a review date. A review date, set two to four weeks before the cutoff, lets you release unbooked rooms back to the hotel without penalty. This gives the hotel time to resell them.
Add a resell credit. Ensure your contract includes a clause that credits you for any rooms the hotel manages to resell. If they fill those rooms with other guests, your liability will be reduced.
Start with a smaller block. It’s easier to add more rooms later than to pay for rooms you don’t need. Many hotels allow you to increase your block if demand is strong, so starting conservatively is a good approach.
Share your booking link early. The earlier your guests book, the more accurate your numbers will be. Using a centralised booking tool helps you track reservations and make changes before the cutoff date.

Attrition vs. Cancellation: Key Differences

It’s important to know the difference between attrition and outright cancellation. Attrition is about not meeting the minimum bookings in your reserved block. Cancellation clauses apply when you cancel the whole block or event. Usually, cancellation penalties are higher—sometimes calculated as a percentage of your total estimated spend on rooms, food and beverage, and meeting spaces combined.

Be sure to read both clauses carefully. If plans change and you need to cancel, knowing the difference helps you choose the option that costs less—whether that’s reducing your block size or cancelling everything.

Frequently Asked
Questions

What’s the usual attrition rate for hotel room blocks?

Most hotels set attrition rates at 75 to 90 percent. So, you’ll need to fill at least 75 to 90 percent of your reserved rooms, or pay a penalty for the empty ones. For weddings, 80 percent is the most common rate in hotel contracts.

How is the attrition penalty calculated?

The hotel multiplies the number of rooms that fell below the minimum commitment by the agreed room rate. Some contracts also include taxes and resort fees in this calculation. For example, if your block has 30 rooms at $200 per night and you need to fill 80%, but only 20 rooms are booked, you’ll have to pay a penalty for 4 rooms (24 minus 20), which totals $800 before taxes.

Can you negotiate the attrition clause?

Yes, you can. You may ask the hotel to lower the required fill percentage, extend the cutoff date, add a review window so you can release rooms before penalties apply, or include a clause that credits any rooms the hotel resells to walk-in guests against your attrition penalty.

What happens if you don’t meet the attrition requirement?

After your event, the hotel will invoice you for any shortfall. Depending on your contract, this may cover just the room charges, or it could also include the hotel’s estimated earnings from food, drinks, and other extras for those guests. Always review the contract details before signing so you understand your maximum financial exposure.

Is an attrition clause the same as a cancellation clause?

No. An attrition clause covers rooms in your block that aren’t booked. A cancellation clause applies if you cancel the whole block or event. Cancellation penalties are usually higher, and may include charges for lost food and beverage revenue, meeting space, and other contracted services.

Time to start planning.

Let’s kick off your wedding planning the right way.

Get Started