Serviceavtalen er klar.

Because Norwegian normally writes compound nouns as one word.

So serviceavtale is a compound made from:

• service
• avtale

This is very common in Norwegian. Where English might sometimes use two words, Norwegian often prefers one compound word.

Examples:

• serviceavtale
• bilverksted
• hjemmekontor

So writing service avtale would look wrong in standard Norwegian.

The ending -en marks the noun as definite singular, so it corresponds to the in English.

• en serviceavtale = a service agreement
• serviceavtalen = the service agreement

Norwegian often adds definiteness to the end of the noun instead of using a separate word like English the.

Because the noun is already definite through the ending -en.

In this sentence:

• serviceavtalen already means the service agreement

So you do not add another separate definite article.

This is a basic feature of Norwegian:

• bilen = the car
• huset = the house
• serviceavtalen = the service agreement

A separate word such as den/det/de is only needed in certain other structures, especially when an adjective comes before the noun:

• den nye serviceavtalen = the new service agreement

Er is the present tense of å være, which means to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• vi er = we are

Norwegian does not change the verb for different persons in the present tense, so er works for all subjects.

Because adjectives in Norwegian agree with the noun in gender and number, even after er.

Here, serviceavtalen is singular and is treated with the klar form, so:

• serviceavtalen er klar

Compare:

• huset er klart = the house is ready
• bilene er klare = the cars are ready

So the pattern is roughly:

• klar for many singular non-neuter nouns
• klart for singular neuter nouns
• klare for plural

Klar often means ready, prepared, or finished enough to be used/signed/sent depending on context.

In a sentence like Serviceavtalen er klar, the idea is usually that the agreement is now ready.

It does not necessarily mean exactly the same thing as English clear here, even though klar can sometimes mean clear in other contexts.

Useful comparison:

• klar = ready / prepared
• ferdig = finished / completed

In real life, the difference can overlap, but klar often focuses on being ready for the next step.

This is normal Norwegian main-clause word order:

• subject
  • verb
    • complement

So:

• Serviceavtalen = subject
• er = verb
• klar = complement/adjective

This is very similar to English:

• The service agreement is ready

Norwegian main clauses also follow the V2 rule, meaning the finite verb is usually in the second position. So if you move something else to the front, the verb still stays second:

• Nå er serviceavtalen klar. = Now the service agreement is ready.

Then you would need a different structure.

In Norwegian, when an adjective comes before a definite noun, you usually need:

• a definite article
• the adjective
• the noun in definite form

So you get:

• den nye serviceavtalen = the new service agreement

This is sometimes called double definiteness.

That is different from your sentence, where klar comes after er:

• Serviceavtalen er klar

Here, klar is not directly attached to the noun as a describing adjective before it; it is part of the predicate, so no extra article is needed.