Disculpe, ¿le importa si cierro la ventana?

Disculpe means excuse me here. It is used to get the other person’s attention politely and to soften the request.

Grammatically, disculpe is the usted command form of disculpar, so it is formal. In English, we often do the same thing with Excuse me before asking for something.

It is formal.

You can tell because of:

• Disculpe instead of disculpa
• le instead of te

In Spain, a more informal version would be:

Perdona, ¿te importa si cierro la ventana?

That would be suitable with friends, family, classmates, or someone you speak to with tú.

Because the sentence is using the formal you, which is usted.

With usted, Spanish uses third-person forms:

• le importa = does it matter to you? / do you mind? in a formal way
• te importa = the same idea, but informal

So:

• ¿Le importa...? = formal
• ¿Te importa...? = informal

Because importar works here with an indirect object: something matters to someone.

So:

• le = to you in the formal singular
• lo = him/it as a direct object, which does not fit this structure

Think of importar here as working like:

• Does it matter to you...?
• Do you mind...?

So the person affected is introduced with le, not lo.

Because Spanish often leaves subject pronouns out when they are clear from context.

Here, you already know it is usted because:

• disculpe is the formal command form
• le importa matches the formal pattern

So usted is understood and does not need to be stated.

You could say ¿A usted le importa...? for emphasis, but normally that would sound unnecessary.

Literally, it is close to:

Does it matter to you if...?

But the natural English meaning is:

Do you mind if...?

So:

• ¿Le importa si cierro la ventana? = Do you mind if I close the window?

This is a very common polite pattern in Spanish.

Because Spanish needs a conjugated verb here.

The subject of the second action is I, so Spanish says:

• si cierro = if I close

It cannot use the infinitive cerrar in this structure.

Compare:

• ¿Le importa si cierro la ventana? = correct
• ¿Le importa si cerrar la ventana? = incorrect

Because after si in this sentence, Spanish uses the indicative, not the subjunctive.

Here si means if / whether, and the speaker is asking about a real possible action:

• si cierro la ventana = if I close the window

So:

• cierro = present indicative, correct
• cierre = subjunctive, not correct in this sentence

This is a very common learner question because English does not make this distinction in the same way.

Because cerrar is a stem-changing verb.

In the present tense, the e in the stem changes to ie in most forms:

• cierro
• cierras
• cierra
• cerramos
• cerráis
• cierran

So cierro means I close.

This is just a normal conjugation pattern, not something special caused by the sentence.

Because the speaker means a specific window that both people can identify, probably the one in the room they are in.

So:

• la ventana = the window
• una ventana = a window, any window, not a specific one

In this context, la ventana is the natural choice.

Because Disculpe is not part of the question itself. It is a separate polite opener.

Spanish punctuation marks only the part that is actually a question:

• Disculpe, ¿le importa si cierro la ventana?

This is very normal in Spanish.

Yes, that is also possible and natural.

There is a small difference in structure:

• ¿Le importa si cierro la ventana?
• ¿Le importa que cierre la ventana?

Both can mean Do you mind if I close the window?

The version with que cierre uses the subjunctive after importa que, which is also a very standard Spanish pattern. Learners often meet both versions.

Yes, several alternatives are natural in Spain, depending on the level of politeness:

• Perdone, ¿le importa si cierro la ventana?
• ¿Le importaría si cierro la ventana? → more polite
• ¿Puedo cerrar la ventana? → simpler, more direct
• ¿Le molesta si cierro la ventana? → Would it bother you if I close the window?

The original sentence is already perfectly natural and polite. It is a good option when speaking formally.