"The house" and "at home" in Spanish?	La casa. "Estoy en casa" (I'm at home) uses no article.
"The flat" or "apartment" in Spanish?	El piso (Spain), el departamento (Mexico, Argentina, Chile), el apartamento (understood everywhere).
"The kitchen" in Spanish?	La cocina. In Spain la cocina also means the cooker or stove.
"The living room" in Spanish?	La sala (de estar), or el salón in Spain.
"The bedroom" in Spanish?	El dormitorio, la habitación or el cuarto. In Mexico also la recámara.
"The dining room" in Spanish?	El comedor.
"The garden" and "the garage" in Spanish?	El jardín, el garaje.
"The floor" and "the ceiling" in Spanish?	El suelo (el piso in much of Latin America), el techo. Techo also means roof.
"The stairs" and "the third floor" in Spanish?	Las escaleras. El tercer piso (or la tercera planta in Spain).
"The door" and "the window" in Spanish?	La puerta, la ventana.
"The wall" in Spanish?	La pared for a wall of a room. El muro for an outside or free-standing wall.
"The table" and "the chair" in Spanish?	La mesa, la silla.
"The sofa" and "the armchair" in Spanish?	El sofá, el sillón.
"The bed" and "the pillow" in Spanish?	La cama, la almohada.
"The wardrobe" or "closet" in Spanish?	El armario (Spain), el clóset or el ropero (Latin America).
"The fridge" and "the oven" in Spanish?	La nevera or el frigorífico (Spain), el refrigerador (Latin America). El horno (oven).
"The washing machine" and "the dishwasher" in Spanish?	La lavadora. El lavavajillas or el lavaplatos.
"The kitchen sink" and "the bathroom sink" in Spanish?	El fregadero (kitchen). El lavabo or el lavamanos (bathroom).
"The shower" and "the bath" in Spanish?	La ducha (la regadera in Mexico). La bañera (la tina in parts of Latin America).
"To turn on" and "to turn off the light" in Spanish?	Encender la luz (prender la luz in Latin America). Apagar la luz.
"The rent" and "to rent" in Spanish?	El alquiler, alquilar (Spain and most countries). La renta, rentar (Mexico).
"To clean the house" in Spanish?	Limpiar la casa. "Los sábados hago la limpieza" (I do the cleaning on Saturdays).
"To do the dishes" in Spanish?	Lavar los platos, or fregar los platos in Spain.
"To make the bed" in Spanish?	Hacer la cama. "Hago la cama todas las mañanas."
"To do the laundry" in Spanish?	Lavar la ropa, or hacer la colada in Spain.