En general, las reparaciones son caras.

En general means in general / generally speaking. It sets up the sentence as a broad statement, not a comment about one specific situation.

So:

• En general, las reparaciones son caras. = In general, repairs are expensive.

You could also hear generalmente, but en general is extremely common and natural.

In Spanish, when you talk about things in a general sense, you often use the definite article:

• las reparaciones = repairs, repairs in general

English often leaves the article out in this kind of sentence:

• Repairs are expensive.

But Spanish usually includes it:

• Las reparaciones son caras.

This does not necessarily mean some specific repairs already mentioned. It can simply mean repairs as a category.

Because the sentence is talking about repairs in general, as a type of thing people deal with.

• la reparación = the repair
• las reparaciones = repairs

You could make it singular, but it would sound more like talking about the concept in a different way:

• La reparación es cara. = Repair is expensive / A repair is expensive

The plural las reparaciones is very natural when making a general statement.

Spanish has two verbs that can mean to be: ser and estar.

Here, son is from ser, and it is used because caras describes an inherent or general characteristic of repairs:

• Las reparaciones son caras. = Repairs are expensive.

You would not normally say están caras here unless you were talking about a temporary situation, like prices being unusually high at the moment. For a broad statement, son is the correct choice.

Because caras is an adjective agreeing with las reparaciones, which is:

• feminine
• plural

Agreement in Spanish means the adjective changes to match the noun.

Here are the forms of caro:

• caro = masculine singular
• cara = feminine singular
• caros = masculine plural
• caras = feminine plural

So:

• la reparación cara
• las reparaciones caras

In the full sentence:

• Las reparaciones son caras.

The singular form is la reparación, so it is feminine.

A useful clue is the ending -ción. Nouns ending in -ción are almost always feminine:

• la reparación
• la situación
• la información
• la conversación

So the plural is:

• las reparaciones

And that is why the adjective must also be feminine plural:

• caras

The singular version is:

• En general, la reparación es cara.

That means In general, repair is expensive or A repair is expensive, depending on context.

But the plural version:

• En general, las reparaciones son caras.

often sounds more natural when speaking generally about this kind of expense.

Yes. That is correct and natural.

• En general, las reparaciones son caras.
• Generalmente, las reparaciones son caras.

Both mean something like Generally, repairs are expensive.

A small nuance:

• en general = in general, broadly speaking
• generalmente = generally, usually

In many everyday contexts, they are very close in meaning.

Yes. Spanish word order is flexible.

These are all possible:

• En general, las reparaciones son caras.
• Las reparaciones son caras en general.

The first version is usually the most natural if you want to frame the whole statement as a general observation from the start.

Putting en general at the end can sound slightly more like an afterthought or a softening comment.

A Spain Spanish pronunciation is approximately:

• reparaciones → reh-pah-rah-thee-OH-nes in much of Spain
• In many other Spanish-speaking places, it sounds more like reh-pah-rah-see-OH-nes

The stress falls on -cio-:

• re-pa-ra-cio-nes

That is because the written accent in the singular reparación shows the stress:

• re-pa-ra-ción

And in the plural:

• re-pa-ra-cio-nes

In this sentence, yes, caras means expensive.

But cara can also mean face, depending on context:

• la cara = the face
• caras = faces

So context matters:

• Las reparaciones son caras. = Repairs are expensive.
• Las caras son bonitas. = The faces are pretty.

In your sentence, because caras is describing reparaciones, it clearly means expensive.

Yes. Costly is possible.

• Las reparaciones son caras. = Repairs are expensive.
• also possible: Repairs are costly.

But expensive is the most direct and common translation for learners.

Spanish often uses an adjective where English might use a different structure.

So Spanish says:

• Las reparaciones son caras. = Repairs are expensive.

English could also say:

• Repairs cost a lot.

In Spanish, that version would be:

• Las reparaciones cuestan mucho.

Both are correct, but your sentence uses ser + caro.

No. The sentence is standard and natural across the Spanish-speaking world.

The only noticeable Spain-specific point is pronunciation, because in most of Spain c before i is pronounced like th in think:

• reparaciones → reh-pah-rah-thee-OH-nes

But the grammar and vocabulary are general Spanish, not Spain-only Spanish.