Korjauskustannus aiheutuu kuivaamisesta.

It is a compound noun: korjaus + kustannus.

In Finnish, compounds are very common. The last part tells you the basic meaning category, so here the main word is kustannus = cost/expense. The first part, korjaus-, tells you what kind of cost it is: a repair cost.

So Finnish does not need a separate of phrase here. Instead of something like cost of repair, it can simply build one compound word.

Because the verb aiheutua normally goes with the elative case, which has the ending -sta/-stä.

A common pattern is:

aiheutua jostakin = to result from something / to be caused by something

So:

• kuivaaminen = drying
• kuivaamisesta = from drying

In natural English, that often corresponds to because of drying, due to drying, or as a result of drying.

The basic form is kuivaaminen.

This is a -minen noun, which is a very common Finnish way to turn a verb into an action noun, similar to English -ing forms.

Here the source verb is kuivata = to dry.
From that you get:

• kuivata = to dry
• kuivaaminen = drying
• kuivaamisesta = from drying

So the sentence uses an action noun rather than a finite verb for drying.

Aiheutuu is the 3rd person singular present tense form of aiheutua.

The verb aiheutua means things like:

• to result from
• to arise from
• to be caused by

So in this sentence it links korjauskustannus to its cause, kuivaamisesta.

Grammatically:

• korjauskustannus = subject
• aiheutuu = verb
• kuivaamisesta = source/cause in the elative case

This is a very common question.

• aiheutua is intransitive: something results from something
• aiheuttaa is transitive: something causes something

Compare:

• Korjauskustannus aiheutuu kuivaamisesta.
  = The repair cost results from drying.

• Kuivaaminen aiheuttaa korjauskustannuksia.
  = Drying causes repair costs.

So the two verbs are closely related, but the sentence structure changes.

Finnish often uses the singular when talking about a cost as one overall expense or as a general concept.

So korjauskustannus can mean something like:

• the repair cost
• a repair cost
• repair cost in general

If you wanted to emphasize multiple separate costs, you could use the plural korjauskustannukset.

English sometimes prefers a plural like repair costs, but Finnish does not always match English number in the same way.

Because Finnish has no articles.

A noun like korjauskustannus can mean:

• a repair cost
• the repair cost
• just repair cost as a general idea

The exact interpretation comes from context, not from a separate article word.

This is completely normal in Finnish.

Yes. Finnish word order is fairly flexible because the grammatical roles are often shown by case endings rather than by strict word order.

This sentence has a neutral order:

Korjauskustannus aiheutuu kuivaamisesta.

But you could also say:

Kuivaamisesta aiheutuu korjauskustannus.

That version puts more focus on kuivaamisesta as the starting point or cause.

So the meaning stays very similar, but the emphasis changes.

They are related, but not always identical.

• kuivaaminen is a -minen noun and usually highlights the action or process of drying
• kuivaus is another noun meaning drying, often a bit more established or technical as a procedure, treatment, or event

In many contexts both can be possible, but kuivaamisesta strongly sounds like from the process/activity of drying.

So the sentence is focusing on the fact that the repair cost comes from that drying process.