Most hotels follow a "double occupancy" pricing model, where the base room rate covers one or two adults. If you add a third or fourth guest to the room, many hotels will indeed charge an "extra guest fee," which typically ranges from $20 to $50 per person, per night. This fee is intended to cover the additional costs of utilities, linens, towels, and the complimentary breakfast (if provided). However, there is a common exception for children under 12 (or sometimes 17) staying in the same room using existing bedding; they are often allowed to stay for free. If you require a "rollaway bed" or a cot for the extra guest, there is almost always a separate daily rental fee for the hardware. In 2026, it is vital to be transparent about your guest count during booking; if the hotel discovers "hidden" guests, they may not only charge the extra fees but could also be in violation of local fire safety codes, which could lead to an eviction without a refund.