Fachowiec naprawia zepsuty domofon w starej kamienicy.

Fachowiec means something like a skilled worker, a tradesperson, a repair professional, or an expert.

In this sentence, it suggests someone who knows how to fix technical things. Depending on context, English translations could include:

• repairman
• technician
• specialist
• professional

It is a fairly broad Polish word, so it does not name a specific job by itself.

Naprawia is the 3rd person singular present tense of naprawiać (to repair / to be repairing).

So it means:

• he repairs
• she repairs
• is repairing

Polish present tense can describe both:

• a general action: The repairman repairs broken intercoms
• an action happening now: The repairman is repairing the broken intercom

Because Polish usually does not need a separate form like English is repairing, context tells you which meaning is intended.

In the present tense, Polish verbs do not show the gender of the subject.

So naprawia can mean:

• he repairs
• she repairs
• it repairs

The noun fachowiec is grammatically masculine, so here we understand the subject as masculine. But the verb form itself does not change for masculine vs. feminine in the present tense.

Gender shows up much more clearly in the past tense, for example:

• Fachowiec naprawiał... = The male repairman was repairing / repaired...
• Fachowczyni naprawiała... = The female specialist was repairing / repaired...

Because domofon is the direct object of the verb naprawia, and it is masculine inanimate.

In Polish, masculine inanimate nouns have the same form in the:

• nominative
• accusative

So:

• nominative: zepsuty domofon
• accusative: zepsuty domofon

The adjective must agree with the noun, so zepsuty also stays the same here.

You would see zepsutego with a masculine animate noun, for example:

• Widzę zmęczonego fachowca = I see the tired repairman

But domofon is not animate, so that does not happen here.

Zepsuty means broken, out of order, or not working.

It comes from the verb zepsuć (to break / to spoil), and as an adjective it describes the state of something:

• zepsuty domofon = a broken intercom
• zepsuty samochód = a broken car
• zepsuty zegarek = a broken watch

So here it simply tells you that the intercom is not working.

Domofon usually means an intercom system, especially the kind used at the entrance to an apartment building so residents can speak to visitors and unlock the door.

A very natural English translation is:

• intercom
• entry phone
• door-entry intercom

It usually refers to the building entrance communication device, not just any kind of intercom in general.

Because w here means in, and after w meaning location, Polish uses the locative case.

The noun kamienica is feminine singular, so in the locative it becomes:

• kamienica → kamienicy

The adjective must agree with it:

• stara → starej

So:

• w starej kamienicy = in the old tenement building / townhouse / apartment building

This is a very common pattern:

• w nowej szkole = in the new school
• w dużej firmie = in the big company

A kamienica is a traditional urban multi-storey building, often older and often divided into apartments. In many contexts it is best translated as:

• tenement building
• townhouse
• old apartment building

But none of these is a perfect one-word match.

For learners, it helps to know that kamienica often suggests an older city building, especially the kind found in Polish town and city centers.

Because the phrase is in the locative case after w.

The basic dictionary form is:

• stara kamienica = an old tenement building

But after w meaning in, both words change:

• w starej kamienicy = in an old tenement building

So starej is simply the feminine singular locative form of stary.

Yes. Polish word order is much more flexible than English word order.

The neutral version here is:

• Fachowiec naprawia zepsuty domofon w starej kamienicy.

But you could also say:

• W starej kamienicy fachowiec naprawia zepsuty domofon.
• Zepsuty domofon w starej kamienicy naprawia fachowiec.

These versions shift the focus or emphasis, but the basic meaning stays similar.

English usually relies more on word order to mark subject and object. Polish relies more on case endings, so word order can move around more freely.

Polish does not have articles like English a/an and the.

So:

• fachowiec can mean a repairman or the repairman
• zepsuty domofon can mean a broken intercom or the broken intercom
• w starej kamienicy can mean in an old tenement building or in the old tenement building

The exact meaning depends on context.

This is very normal in Polish, and learners have to get used to understanding definiteness from the situation rather than from an article.

Yes. Naprawiać is imperfective.

That matters because the sentence presents the action as:

• ongoing,
• repeated,
• or simply viewed without emphasizing completion.

So naprawia means something like:

• is repairing
• repairs

If you wanted to emphasize a completed action, you would usually use the perfective verb naprawić, for example:

• Fachowiec naprawił zepsuty domofon. = The repairman repaired / fixed the broken intercom.

So the original sentence focuses on the process or present activity, not on the finished result.