Privremeno radim od kuće, jer je ured zatvoren.

Yes — radim can mean both I work and I am working.

Croatian present tense often covers both:

• a general present: I work
• a current ongoing action: I am working

So Privremeno radim od kuće can mean:

• I’m temporarily working from home
• I temporarily work from home

In this sentence, because of privremeno (temporarily), the intended meaning is clearly about a temporary current situation.

Because Croatian usually does not need subject pronouns when the verb already shows who is doing the action.

Here, radim is the 1st person singular form, so it already means I work / I am working. That makes ja unnecessary.

• radim = I work / I am working
• ja radim = I work

You would add ja only for emphasis or contrast, for example:

• Ja radim od kuće, a on ide u ured. = I’m working from home, but he’s going to the office.

Privremeno means temporarily. It is an adverb, so it describes how or in what way the action is happening.

Here it modifies radim:

• Privremeno radim = I am working temporarily

Croatian adverbs are often quite flexible in position, so you may also see:

• Radim privremeno od kuće

But the original version sounds very natural and gives early emphasis to the temporary nature of the situation.

Because raditi od kuće is the standard Croatian expression for to work from home.

Even though both od and iz can sometimes relate to movement away from a place, in this fixed expression Croatian uses od kuće.

So:

• raditi od kuće = to work from home

Using iz kuće here would sound unnatural in standard usage.

This is one of those phrases that learners often just need to memorize as a set expression.

Kuće is in the genitive singular.

That is because the preposition od normally takes the genitive case.

So:

• kuća = house, home nominative singular
• od kuće = from home genitive singular

This is a very common Croatian pattern:

• od škole = from school
• od prijatelja = from a friend
• od kuće = from home

Because jer means because and introduces a subordinate clause.

The sentence has two parts:

• Privremeno radim od kuće
• jer je ured zatvoren

In Croatian, a clause introduced by jer is normally separated by a comma:

• ..., jer ...

So the comma here is standard and expected.

Because Croatian clitics — short unstressed words like forms of biti (sam, si, je, smo...) — usually go in the second position in their clause.

In the clause:

• jer je ured zatvoren

the word je comes right after jer, which is normal Croatian word order.

So this is the natural structure:

• jer je ured zatvoren = because the office is closed

A version like jer ured je zatvoren sounds unnatural in standard Croatian.

Because ured is the subject of the clause je ured zatvoren.

The basic structure is:

• ured = subject
• je = is
• zatvoren = closed

Subjects are normally in the nominative case, so:

• ured = nominative singular

That is why it is not in some other case here.

Because zatvoren agrees with ured.

• ured is masculine singular
• so the adjective must also be masculine singular

That gives:

• ured je zatvoren = the office is closed

Compare:

• kuća je zatvorena = the house is closed / shut
  (kuća is feminine)
• mjesto je zatvoreno = the place is closed
  (mjesto is neuter)

So the ending changes to match the gender and number of the noun.

In this sentence, learners can most usefully think of zatvoren as a predicate adjective meaning closed.

So:

• ured je zatvoren = the office is closed

Historically and grammatically, it is related to a passive participle from zatvoriti (to close), but in everyday learning it is often easiest to understand it simply as an adjective describing the office’s state.

Similar examples:

• Vrata su otvorena. = The door is open / The doors are open.
• Trgovina je zatvorena. = The shop is closed.

Not in this sentence if you mean working from home.

• od kuće is the normal expression with raditi
• kod kuće means at home

So:

• Radim od kuće. = I work from home.
• Kod kuće sam. = I am at home.

Both are correct, but they mean different things.

In this phrase, kuće is best understood as home.

The noun kuća literally means house, but in the expression od kuće it often functions like English from home, not necessarily emphasizing the physical building.

So:

• raditi od kuće = to work from home

This is very similar to how English uses home in a broad, natural way.

Yes, Croatian word order is fairly flexible, but some versions are more natural than others.

The original:

• Privremeno radim od kuće, jer je ured zatvoren.

Possible alternatives:

• Radim od kuće privremeno, jer je ured zatvoren.
• Jer je ured zatvoren, privremeno radim od kuće.

These are grammatically possible, but the original sounds very natural and neutral.

What usually stays stable is:

• od kuće as a phrase
• je in second position in its clause
• zatvoren agreeing with ured