Cuarto vs. habitación vs. pieza vs. sala

In Spanish, there are several ways to refer to a 'room' in a building or house. The words “cuarto”, “habitación”, “pieza”, and “sala” all somewhat represent this, but each has its own nuances and uses based on regions and contexts.

Cuarto

This term literally implies the number four, but when used in context, it can mean a room in general. It is often used to depict private or separate rooms in a house.
El cuarto de baño está limpio.
(The bathroom is clean.)
Su cuarto está al final del pasillo.
(His room is at the end of the hallway.)

Habitación

Habitación can be used to describe any space within a structure that is enclosed by walls. However, it is commonly associated with bedrooms.
Voy a limpiar mi habitación.
(I am going to clean my bedroom.)
La casa tiene tres habitaciones.
(The house has three bedrooms.)

Pieza

Pieza can translate as 'piece', but in this context, it typically refers to a room within a house. However, its usage can vary depending on location; in some countries, it's commonly used for bedrooms.
La pieza principal tiene una hermosa vista al mar.
(The main room has a beautiful view of the sea.)
Esta es la pieza de los niños.
(This is the children's room.)

Sala

Sala typically refers specifically to the living room or main social area of a house where family or guests gather.
Vamos a ver la televisión en la sala.
(Let's watch television in the living room.)
La sala está decorada para la Navidad.
(The living room is decorated for Christmas.)

Summary

'Cuarto', 'habitación', 'pieza', and 'sala' are all words in Spanish which can all refer to different types of rooms within a building or house. While 'cuarto' often represents private or separate rooms like bathrooms or bedrooms, 'habitación' usually denotes bedrooms. In some regions, 'pieza' might be used interchangeably with 'habitación', while 'sala' typically represents the living room area.