Nøkkeloverleveringen skjer etter utflyttingen.

Because Norwegian normally writes compound nouns as a single word.

• nøkkel = key
• overlevering = handover / transfer

Together, nøkkeloverlevering means key handover.

This is very common in Norwegian. English often uses separate words where Norwegian prefers one compound word.

The ending -en is the definite article attached to the noun. In English, this usually corresponds to the.

So:

• nøkkeloverlevering = key handover
• nøkkeloverleveringen = the key handover

And:

• utflytting = moving out / move-out
• utflyttingen = the moving out / the move-out

In Norwegian, the definite article is often added to the end of the noun instead of being a separate word.

Because the sentence is talking about specific events in a known situation, not about the ideas in general.

This kind of sentence often appears in practical contexts such as renting, property management, or moving. In that setting, both the key handover and the move-out are understood as specific, expected steps in a process.

So the definite forms sound natural:

• nøkkeloverleveringen
• utflyttingen

If you removed the definite endings, the sentence would sound more general or more like a rule or heading.

Skjer is the present tense of å skje, which means to happen or to take place.

So skjer here means something like:

• happens
• takes place
• occurs

It is a very natural verb when talking about an event or process. Norwegian often uses skje where English might use something broader like be or take place.

Because Norwegian often uses the present tense for scheduled, expected, or planned future events.

This is similar to English sentences like:

• The meeting starts at 10.
• We leave tomorrow.

So Nøkkeloverleveringen skjer etter utflyttingen can refer to what is going to happen as part of an arrangement or procedure, even though the verb is in the present tense.

Because in Norwegian, a definite noun usually does not need a separate word for the. The definiteness is already shown by the ending -en.

So:

• etter utflyttingen = after the move-out

You would normally only add den if you wanted extra emphasis, contrast, or if there were an adjective:

• etter den endelige utflyttingen = after the final move-out

Without an adjective or special emphasis, etter utflyttingen is the normal form.

They are related, but they are different kinds of words.

• å flytte ut is a verb phrase: to move out
• utflytting is a noun: moving out / move-out

So:

• Vi skal flytte ut = We are going to move out
• Utflyttingen skjer i juni = The move-out takes place in June

In formal or administrative Norwegian, noun forms like utflytting, innflytting, and overlevering are very common.

This is the normal Norwegian main-clause pattern:

• subject
  • finite verb
    • other information

Here that gives:

• Nøkkeloverleveringen = subject
• skjer = finite verb
• etter utflyttingen = adverbial phrase

Norwegian follows the V2 rule in main clauses, which means the finite verb normally comes in the second position.

For example, you could also say:

• Etter utflyttingen skjer nøkkeloverleveringen.

That is also correct, and skjer still stays in second position.

Yes, but it changes the feel of the sentence.

• Nøkkeloverleveringen skjer etter utflyttingen sounds like a specific situation or process.
• Nøkkeloverlevering skjer etter utflytting sounds more general, like a rule, policy, or heading.

So the version with definite endings is more natural when talking about a particular tenancy or move.

The ending -ing is a common way of forming nouns from verbs in Norwegian.

For example:

• å overlevere → overlevering
• å flytte ut → utflytting

These -ing nouns often refer to:

• an action
• a process
• an event

So both overlevering and utflytting are action nouns, similar to English words like handover or moving out.

Sometimes, yes. In Bokmål, many nouns of this type can be treated as feminine, and feminine definite forms often end in -a.

So you may also see forms like:

• utflyttinga
• overleveringa

But -en forms are also very common in Bokmål, and in many contexts they are the safest choice for learners.

So the sentence with -en is completely normal:

• Nøkkeloverleveringen skjer etter utflyttingen.