Mañana peritarán la rotura.

Peritarán is the 3rd person plural simple future of peritar.

• peritar = to assess officially, to appraise, to inspect as an expert
• -án = the ending for they will

So grammatically, peritarán means they will appraise / they will assess officially.

A useful point: in Spanish, the simple future is added to the whole infinitive:

• peritar
  • -án → peritarán

Because Spanish often drops subject pronouns when the verb ending already shows who the subject is.

In peritarán, the ending -án tells you the subject is they (or sometimes you plural in Latin America, but in this kind of sentence it is usually understood as they).

So Spanish does not need ellos:

• Mañana peritarán la rotura. = natural
• Mañana ellos peritarán la rotura. = possible, but usually only if you want emphasis or contrast

Not really. Peritar is quite technical and is especially common in contexts like:

• insurance
• legal claims
• vehicle damage
• property damage
• expert reports

In everyday conversation, many speakers might say something more ordinary, such as:

• Mañana vendrá el perito.
• Mañana revisarán la avería.
• Mañana evaluarán los daños.

So the sentence is correct, but it sounds a bit specialised or professional.

Mañana can mean either:

• tomorrow
• morning

In this sentence, without more context, it is usually understood as tomorrow.

If someone specifically wanted to say in the morning, Spanish very often says:

• por la mañana

So:

• Mañana peritarán la rotura. = probably They will assess the damage tomorrow
• Por la mañana peritarán la rotura. = They will assess the damage in the morning

Context always decides, but tomorrow is the more likely reading here.

Spanish uses the definite article much more often than English does.

Here, la rotura refers to a specific breakage/damaged part that both speaker and listener already know about. That is why the article sounds natural.

So Spanish says:

• peritarán la rotura

where English might say:

• they will assess the breakage
• they will assess the damage

The article does not necessarily mean the in a heavily emphatic way; often it just marks something as the known or relevant object in the situation.

Rotura is more specific. It usually refers to something broken, a break, breakage, or a rupture.

By contrast:

• daño = damage in a broad sense
• rotura = damage specifically involving something broken

So rotura is a good choice if the issue is, for example:

• a broken pipe
• a broken window
• a broken component
• a crack or rupture in something

It sounds more precise than daño.

Yes. Spanish word order is more flexible than English word order.

This sentence begins with Mañana to highlight when the action will happen:

• Mañana peritarán la rotura.

Other orders are possible, for example:

• Peritarán la rotura mañana.

That is also grammatical, but it may sound slightly different in focus. Starting with Mañana is very natural if the speaker wants to foreground the time.

The accent mark shows the correct stress: pe-ri-ta-RÁN.

Spanish spelling rules would normally make a word ending in n stressed on the second-to-last syllable, but here the stress must fall on the last syllable, so an accent mark is needed:

• peritaran would suggest the wrong stress pattern
• peritarán shows the correct pronunciation

This is normal for many future forms:

• hablarán
• comerán
• vivirán
• peritarán

Yes, it is grammatical and natural, especially in a formal or professional context in Spain, such as insurance or repair claims.

That said, in everyday speech in Spain, people might often say something a bit more conversational, such as:

• Mañana vendrá el perito.
• Mañana van a revisar la rotura.
• Mañana tasarán los daños.

So the original sentence is perfectly fine, but it sounds a little more like the language of a report, claim, or official process than casual conversation.