How many guests can legally stay at your short-term rental? It may be fewer than the number of beds you can fit inside.

For Airbnb hosts, Vrbo hosts, and other STR operators, occupancy can depend on bedroom count, square footage, fire-safety requirements, and septic capacity. Knowing your actual limit can help you avoid unauthorized bookings and compliance problems.

What the rule says

The “2 guests per bedroom + 2” formula is commonly used for short-term rentals, but it is not a nationwide rule. Each city or county can establish its own occupancy requirements.

Some jurisdictions use bedroom-based formulas. Mono County, California, for example, generally uses 2 people per bedroom + 2 additional people, with a 10-person maximum unless additional building approval applies. Septic capacity can also reduce the allowed occupancy.

Meredith, New Hampshire, uses a similar 2 people per permitted bedroom + 2 additional people approach and requires the septic system to support the permitted bedrooms.

Other jurisdictions use different formulas. Rockingham County, Virginia, for example, allows different occupancy levels depending on whether the property is served by public sewer or private septic.

Occupancy may also be affected by building and fire codes. Floor area, available exits, and the intended use of a space can affect how many people can safely occupy it.

Where these rules apply

Occupancy rules vary significantly by jurisdiction, so the same property setup may have different legal guest limits depending on where it is located. Here are a few examples of how local governments approach STR occupancy:

• Mono County, California: Uses a 2 guests per bedroom + 2 additional guests formula, with additional restrictions that can affect the final occupancy limit. This shows how a commonly used bedroom formula can still be subject to a local maximum.
• Meredith, New Hampshire: Allows 2 people per permitted bedroom + 2 additional people. The property's septic system must also be capable of supporting the permitted bedroom count, meaning wastewater capacity can affect STR eligibility.
• Rockingham County, Virginia: Occupancy depends partly on the property's wastewater system. Properties connected to public sewer can have a different limit from properties using private septic, showing why hosts need to check more than just bedroom count.
• Warwick, New York: Connects STR occupancy to the property's approved septic capacity and recorded bedrooms. A host therefore cannot simply increase guest capacity by adding beds to an existing room.
• Weber County, Utah: Uses a bedroom-based occupancy formula but allows property-specific restrictions to reduce the maximum. This reinforces the importance of checking the actual STR approval for your property rather than relying on a general formula.

These examples highlight an important point: you should never assume that the “2 + 2” formula applies to your property.

What this means for hosts

Adding more beds does not automatically increase your legal guest limit. Your approved bedrooms, property size, exits, septic system, and local STR rules may establish a lower maximum.

Your advertised occupancy should match the limit allowed by your applicable permits and regulations. If your listing promises accommodation for more guests than legally permitted, you could face enforcement action or be required to reduce the advertised capacity.

What hosts should do right now

• Check your local occupancy rule: Find the specific formula or maximum used by your city or county.
• Verify your bedroom count: Confirm which rooms are legally recognized as bedrooms.
• Check your septic capacity: If your property uses private septic, confirm its approved capacity.
• Review fire and building requirements: Make sure your occupancy complies with applicable safety requirements.
• Update your listings: Ensure Airbnb, Vrbo, Booking.com, and direct-booking listings show the correct maximum occupancy.
• Keep your records: Maintain copies of permits, septic approvals, floor plans, and inspection documents supporting your occupancy limit.

The 2 guests per bedroom + 2 formula is common, but it is not a universal STR standard. Your property's legal occupancy may be lower because of local zoning, building or fire requirements, septic capacity, or your STR permit.

Your Action Checklist

Before accepting your next booking, confirm your legal bedroom count, local occupancy formula, septic or sewer capacity, fire-safety requirements, and permitted maximum occupancy. Then make sure every booking channel reflects the same limit.

Not sure what this means for your property? Get your free compliance report at lodgecompliance.com.