In many countries, guest houses fall under the same classification as hotels, hostels, bed and breakfasts, etc. - as an accommodation/lodging business.
What is a Casita? Casitas, or guest houses, are accessory dwelling units (ADU) the are separate from the main house. These can be useful in retirement because you don't have to worry about being inconvenienced if guests are over.
Regardless of their tastes or budget, there's a guest house that fits every type of traveler out there. In this guide, we'll cover the 8 types of guest houses (with examples). These include: rural, urban, budget, luxury, boutique, historic/cultural, mountain and eco-friendly. Some guest houses are a hybrid of multiple.
Accessory dwelling units (ADU) are also referred to in California as granny flats, guest houses, mother-in-law apartments, in-law suites, casitas, etc, depending on local custom.