Ti dà fastidio se apro la finestra?

Ti is the object pronoun, meaning to you or you as the person affected.

• tu = you as the subject
• ti = you as the object

In Ti dà fastidio, the idea is it bothers you, so Italian uses ti, not tu.

A very literal breakdown is:

• ti = to you
• dà fastidio = gives annoyance / bothers

So the structure is not you do something, but rather something affects you.

Dare fastidio is a very common Italian expression meaning:

• to bother
• to annoy
• to inconvenience
• to be a nuisance

So Ti dà fastidio se apro la finestra? is a natural way to say Do you mind if I open the window?

Literally, it is closer to Does it give you annoyance if I open the window?, but in normal English that sounds unnatural, so Do you mind...? or Does it bother you...? is better.

The accent distinguishes dà from da.

• dà = he/she/it gives from the verb dare
• da = from, by, at

So here dà is the verb, and the accent helps avoid confusion.

Examples:

• Mi dà un consiglio. = He/She gives me advice.
• Vengo da Milano. = I come from Milan.

Because dare fastidio is a fixed expression.

Italian normally says:

• dare fastidio a qualcuno = to bother someone

not usually:

• dare il fastidio
• dare un fastidio

In this expression, fastidio works as part of the idiom, so no article is needed.

You can use un fastidio in other contexts, such as È un fastidio, meaning It is a nuisance, but that is a different structure.

This works a lot like English Does it bother you if...?

In English, it is often just a structural subject. Italian often does the same idea without saying an actual it.

So in Ti dà fastidio se apro la finestra?, the thing that bothers you is the whole situation: me opening the window. Italian leaves that understood and simply uses the third person singular dà.

You can think of it as:

• [Questo] ti dà fastidio?
• Does [this] bother you?

where this is the action introduced by se apro la finestra.

Because Italian commonly uses the present indicative after se when the condition is real or possible.

So:

• se apro la finestra = if I open the window

Here the speaker is asking about a real, immediate possibility, not a hypothetical or unlikely situation.

That is why apro is natural.

If you wanted a more hypothetical idea, Italian could use:

• Ti darebbe fastidio se aprissi la finestra?
• Would it bother you if I opened the window?

So:

• se apro = real/immediate possibility
• se aprissi = more hypothetical

Because Italian usually drops subject pronouns when the verb ending already makes the subject clear.

Apro already tells you the subject is I.

So:

• apro = I open
• io apro = I open, but with extra emphasis

You would add io only if you want contrast or emphasis, for example:

• Se apro io la finestra, va bene?
  = If I open the window, is that okay?

In the original sentence, io is unnecessary.

Yes. That is completely natural.

Both versions are correct:

• Ti dà fastidio se apro la finestra?
• Se apro la finestra, ti dà fastidio?

The difference is mainly one of focus:

• Ti dà fastidio... ? starts with the other person’s comfort or reaction
• Se apro la finestra... ? starts with the action itself

The original version can sound slightly more considerate because it puts your possible discomfort first.

Yes, it is a normal and polite way to ask.

If you want to be more formal, change ti to Le:

• Le dà fastidio se apro la finestra?

That is the polite form used with one person in formal situations.

Other possibilities:

• Vi dà fastidio se apro la finestra? = Do you all mind if I open the window?
• Le dispiace se apro la finestra? = Do you mind if I open the window?
  This can sound a little softer or more courteous.

So the sentence you have is polite and everyday; Le dà fastidio... is the formal version.

It can mean both.

Fastidio can refer to:

• annoyance
• bother
• inconvenience
• discomfort

So in this sentence, the speaker may be asking whether opening the window would:

• annoy you
• make you uncomfortable
• make you cold
• create a draft you do not like

That is why English often translates this kind of sentence as Do you mind...? rather than only Does it annoy you...?

Yes, absolutely. Ti dispiace se apro la finestra? is very common.

Both are natural, but the nuance is slightly different:

• Ti dà fastidio...? focuses on whether something bothers or inconveniences you
• Ti dispiace...? often sounds a little softer and closer to Would you mind...?

In many everyday situations, they can be used almost interchangeably.

So:

• Ti dà fastidio se apro la finestra? = Does it bother you / Do you mind if I open the window?
• Ti dispiace se apro la finestra? = Do you mind if I open the window?

The second one is often felt as a bit gentler.