The number of bathrooms in a 4 bedroom house can vary depending on the size and layout of the property. However, as a general rule of thumb, most 4 bedroom houses in the UK will have at least 2 bathrooms - one on each floor. This is because having a bathroom on each floor is seen as a necessity for most families, and is often a key selling point for properties.
Of course, some 4 bedroom houses may have more than 2 bathrooms, depending on the needs of the family. For example, a family with young children may opt for a house with 3 bathrooms so that they can have a dedicated bathroom for the kids. Alternatively, a family who entertain guests frequently may choose a 4 bedroom house with 3 or even 4 bathrooms so that their guests always have a clean and comfortable place to use the facilities.
Ultimately, the number of bathrooms in a 4 bedroom house is up to the needs and preferences of the family who will be living there. However, most 4 bedroom houses in the UK will have at least 2 bathrooms to cater for the needs of the average family.