What’s an Attrition Clause in a Hotel Block?

An attrition clause is a part of a hotel room block contract that means you’re required 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 income from the empty rooms. Most contracts set the minimum between 75 and 90 percent of the total block.

How an Attrition Clause Works

When you sign a contracted room block agreement with a hotel, the property sets aside a set number of rooms at an agreed rate. In return, the hotel expects a certain level of occupancy. The attrition clause puts that expectation in writing. It sets out a minimum fill rate, usually as a percentage, and explains the financial consequences if bookings don’t meet the mark.

The clause works alongside your room block cut-off date. Once the cut-off date has passed, the hotel counts up the rooms that were actually booked. If the number is below the agreed minimum, the attrition penalty kicks in. The hotel will then invoice you for the difference between the required minimum and the actual number of rooms filled.

Why the Attrition Clause Matters for Weddings

Wedding room blocks often cover 10 to 50 or more rooms over one or two nights. That’s a fair bit of revenue for the hotel. The attrition clause protects the hotel from holding onto rooms that end up not being booked. For you, it’s a potential financial risk that could range from a few hundred pounds to several thousand.

Getting to grips with the clause before you sign means you can size your block sensibly. Overestimating how many guests will book rooms is the most common reason couples get hit with attrition charges. A realistic headcount, based on how your guests tend to travel and where your venue is, helps you avoid paying for rooms that go unused.

Common Attrition Rates and Penalty Structures

Hotels structure attrition penalties in a few different ways:

Percentage-based threshold. This is the most common approach. You’ll need to fill 80 percent (or another agreed figure) of your room block. Penalties only apply to the gap between the threshold and your actual bookings, not to every unfilled room.
Revenue-based calculation. The penalty matches the lost room revenue for each unfilled room below the threshold. Some contracts also take into account taxes, resort fees, or estimated extra spending.
Sliding scale. A handful of hotels use tiered penalties: a lower charge if you fill 70 to 79 percent, and a higher charge if you drop below 70 percent.
Resell credit. Some contracts include a clause stating that if the hotel resells an attrition room to a walk-in guest, that room no longer counts towards your shortfall.

Always ask the hotel to confirm exactly which charges are included in the penalty calculation before you finalise the agreement.

Tips for Negotiating a Favourable Attrition Clause

You’ve got more sway than you might think, especially during quieter seasons or at hotels keen to host wedding parties. Try these tips:

Lower the threshold. Ask the hotel to drop the required fill rate from 80 percent to 70 percent. Even a small reduction could save you hundreds of pounds if a few guests change their plans.
Request a review date. A review date, set two to four weeks before the cut-off, lets you release any unbooked rooms back to the hotel without penalty. This gives them time to resell those rooms on the open market.
Add a resell credit. Make sure the contract includes wording that credits resold rooms against your attrition count. If the hotel fills those rooms with other guests, your liability drops accordingly.
Start with a smaller block. It’s easier to add rooms later than to pay for ones you don’t need. Many hotels will let you increase your block if demand is high, so starting small is a smart move.
Share your booking link early. The sooner guests book, the sooner you’ll have accurate numbers. Managing room blocks through a centralised booking tool helps you keep track and act before the cut-off date rolls around.

Attrition vs Cancellation: Key Differences

It's important to tell the difference between attrition and full cancellation. Attrition covers a shortfall in bookings within a block you've reserved. Cancellation clauses come into play if you call off the whole block or event. Penalties for cancellation are usually higher, sometimes worked out as a percentage of the total estimated revenue from rooms, food and drink, and meeting space combined.

Take a close look at both clauses. If things change and you need to cancel, knowing the difference helps you find the most cost-effective way forward—whether that's shrinking your block or cancelling altogether.

Frequently Asked
Questions

What is a typical attrition rate in a hotel block?

Most hotels set attrition rates between 75% and 90%. This means you’ll need to fill at least 75% to 90% of the rooms in your block, or pay a penalty for any that aren’t booked. An 80% rate is the most common threshold in wedding hotel contracts.

How is the attrition penalty worked out?

The hotel multiplies the number of rooms that fall short of the minimum commitment by the agreed room rate. Some contracts also add on taxes and resort fees. For example, if your block has 30 rooms at £200 per night and you need to fill 80 percent, dropping to 20 rooms means you’ll owe a penalty on 4 rooms (24 minus 20), which comes to £800 before taxes.

Can you negotiate the attrition clause?

Yes. You can ask the hotel to reduce the required occupancy percentage, extend the cut-off date, add a review period so you can release rooms before any penalties kick in, 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?

The hotel will invoice you for any shortfall after the event. Depending on your contract, the charge might cover just the room revenue, or it could also include estimated food, drink, and any extra revenue the hotel expected from those guests. It’s worth reading the contract carefully before signing, so you know exactly what you could be liable for.

Is an attrition clause the same as a cancellation clause?

No. An attrition clause covers rooms left unbooked within a block you’re holding. A cancellation clause comes into play if you cancel the whole block or event. Cancellation penalties are usually higher and can include charges for lost food and drink revenue, meeting space, and other contracted services.

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