How old do I need to be to book a hotel stay at LEGOLAND® California Resort? Guests must be 21 years of age or older to check in and book overnight accommodations at the LEGOLAND® Hotel or LEGOLAND® Castle Hotel. Was this article helpful? Related articles How Much Will a Room Cost Per Night? What is the cost of the Trip Protection Plan for hotel bookings at LEGOLAND® California Resort? I have a hotel stay booked and tickets are part of the package. Do I also need to make a day reservation to visit? How Can I Contact LEGOLAND® California Resort? What amenities are included in each room at the LEGOLAND Castle Hotel?