Sovituskoppi on vapaa nyt, joten voit mennä sinne heti.

Sovituskoppi is a compound noun:

• sovitus = fitting, trying on
• koppi = booth, cubicle, stall

So sovituskoppi literally means something like fitting booth or changing cubicle, and in natural English it is usually fitting room or changing room.

This kind of compound is very common in Finnish: two nouns are joined together to make one new word.

Here vapaa is an adjective meaning free or available.

In Sovituskoppi on vapaa:

• sovituskoppi is the subject
• on = is
• vapaa is a predicate adjective

Because sovituskoppi is singular, vapaa stays in the singular basic form too.

So the structure is simply:

• The fitting room
  • is
    • free/available

This is a very common Finnish sentence pattern.

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

So sovituskoppi can mean:

• a fitting room
• the fitting room

The exact meaning depends on context. In this sentence, the situation makes it clear that it means something like the fitting room or a fitting room is available now.

Nyt means now.

It tells you that the fitting room is free at this moment. Without nyt, the sentence would still mean that the fitting room is free, but nyt adds the idea that this is true right now, perhaps after being occupied before.

So:

• Sovituskoppi on vapaa. = The fitting room is free.
• Sovituskoppi on vapaa nyt. = The fitting room is free now.

Joten means so, therefore, or thus. It introduces a result or conclusion.

In this sentence:

• Sovituskoppi on vapaa nyt = The fitting room is free now
• joten voit mennä sinne heti = so you can go there right away

So the second part follows as a result of the first part.

This is different from koska, which means because and gives a reason.

Compare:

• Sovituskoppi on vapaa, joten voit mennä sinne.
  The fitting room is free, so you can go there.

• Voit mennä sinne, koska sovituskoppi on vapaa.
  You can go there because the fitting room is free.

Voit mennä literally means you can go.

It sounds softer and less direct than mene, which is the imperative go.

So:

• voit mennä sinne heti = you can go there right away
• mene sinne heti = go there right away

In shops or service situations, Finnish often uses forms like voit mennä because they sound polite and natural.

In Finnish, the verb ending usually already tells you who the subject is.

Here:

• voit = you can

Because the ending -t already shows it is sinä (you singular), the pronoun is usually left out unless it is needed for emphasis or contrast.

So:

• voit mennä sinne = you can go there
• sinä voit mennä sinne = you can go there

The second version sounds more emphatic.

This is a very common Finnish distinction:

• siellä = there, in that place
• sinne = to there, to that place

Since the verb mennä means to go, it usually needs a word showing movement toward a place, not location in a place.

So:

• mennä sinne = go there
• olla siellä = be there

That is why sinne is correct here.

Heti means immediately, right away, or at once.

So voit mennä sinne heti means:

• you can go there immediately
• you can go there right away

It adds a sense that there is no need to wait.

Yes, Finnish word order is fairly flexible, although the original sentence is the most neutral and natural.

For example:

• Sovituskoppi on nyt vapaa
• Nyt sovituskoppi on vapaa

Both are possible, but they shift the emphasis slightly.

• Sovituskoppi on vapaa nyt emphasizes the state now
• Nyt sovituskoppi on vapaa puts now earlier for emphasis

Similarly, in the second clause:

• voit mennä sinne heti is the most neutral
• heti voit mennä sinne would sound unusual in normal conversation

So yes, Finnish allows variation, but not every rearrangement sounds equally natural.

Not exactly.

Vapaa means free, available, not occupied, or not reserved.

For a fitting room, vapaa means nobody is using it, so it is available for you.

Tyhjä means empty, but that would focus more on the room containing nothing rather than being available for use.

In this context, Finnish naturally uses vapaa, not tyhjä.

It is neutral and natural everyday Finnish.

It would sound perfectly normal in a shop, for example if an employee tells a customer that the fitting room is available.

It is not especially formal, but it is polite because of the phrasing voit mennä instead of a direct command.