Arriba hay una sala abierta.

Arriba usually means up/upstairs/above, and the exact idea depends on context.

In this sentence, it could mean:

• upstairs if you are talking about parts of a building
• above if you are talking about something higher than the speaker

So Arriba hay una sala abierta could be understood as There is an open room upstairs or Above, there is an open room, depending on the situation.

A useful comparison:

• arriba = up, above, upstairs
• encima = on top of, over

So arriba is broader, while encima is more specifically about position over something.

Because hay is used to say that something exists: there is / there are.

• Hay una sala abierta = There is an open room.
• La sala está abierta = The room is open.

That is a very important difference in Spanish:

• hay introduces something as existing
• estar usually talks about the location or condition of a specific thing

Compare:

• Arriba hay una sala abierta. = There is an open room upstairs.
• La sala está arriba. = The room is upstairs.

Since the sentence is introducing una sala as something that exists in that place, hay is the right choice.

Hay comes from the verb haber.

In this use, haber is impersonal, which means it does not agree with the noun that follows. So Spanish uses the same form whether the thing is singular or plural:

• Hay una sala. = There is a room.
• Hay dos salas. = There are two rooms.

English changes from is to are, but Spanish keeps hay in both cases.

This is one of the most common beginner patterns in Spanish.

Spanish usually needs an article here, so una sala is the normal form.

With hay, you typically introduce something new or unspecified, so an indefinite article is very common:

• hay una sala
• hay un problema
• hay unas mesas

Leaving out the article would usually sound incomplete or unnatural in standard Spanish.

Also, la sala would change the meaning. It would refer to a specific room already known in the conversation, and hay la sala is generally not the normal standard pattern.

Because abierta has to agree with sala.

Sala is:

• feminine
• singular

So the adjective must also be:

• feminine
• singular

That gives:

• sala abierta

Compare:

• un cuarto abierto
• una puerta abierta
• unos cuartos abiertos
• unas puertas abiertas

This is standard adjective agreement in Spanish.

Because in Spanish, adjectives usually come after the noun.

So the normal order is:

• una sala abierta
• una casa grande
• un libro interesante

Putting the adjective before the noun is sometimes possible, but it often sounds more literary, emphatic, or changes the nuance. For a basic descriptive sentence, una sala abierta is the natural choice.

Yes. That is also correct.

Both of these are natural:

• Arriba hay una sala abierta.
• Hay una sala abierta arriba.

The difference is mainly about focus:

• Arriba hay... emphasizes the location first
• Hay... arriba introduces the room first, then adds where it is

Spanish word order is fairly flexible, especially with adverbs like arriba.

Sala can mean different things depending on context. In Latin American Spanish, it often means:

• living room
• sitting room
• hall
• more generally, a room or hall-like space

So the exact English equivalent depends on the situation.

For example:

• la sala de la casa often means the living room
• una sala de espera = a waiting room
• una sala de reuniones = a meeting room

So if you learned the translation as room, that may be fine for this sentence, but in real life sala often has a more specific feel than just any room.

It can mean different things depending on context.

Abierto / abierta can mean:

• physically open
• open to the public
• available or accessible
• not closed off

So una sala abierta might mean:

• a room whose door is open
• an open room or open area
• a room that is available for use

The exact nuance comes from the situation, not from the adjective alone.

In most of Latin America, hay is pronounced roughly like the English word eye.

A simple guide:

• hay → sounds like eye
• arriba → ah-REE-bah
• abierta → ah-BYER-tah

The h in Spanish is silent, so in hay you do not pronounce any h sound.

Also, in abierta, the ie forms a glide, so it sounds like byer, not like two fully separate syllables.