Politiet omringer huset.

Because both nouns are in the definite singular neuter form.

• hus = house

• huset = the house

• politi = police / police force
• politiet = the police

In Norwegian, many neuter nouns take -et when they become definite.

Norwegian usually puts the idea of the at the end of the noun instead of using a separate word before it.

So:

• hus = house
• huset = the house

This is very common in Norwegian.
If there is an adjective, Norwegian often uses double definiteness:

• det store huset = the big house

So in your sentence, politiet and huset already include the.

Grammatically, it is a singular definite form, but its meaning is collective.

So politiet means the police as a group or institution, not just one person.

This is a bit different from English, where the police is grammatically plural in form. In Norwegian, politiet is just the normal way to say the police.

You would normally use a different noun, such as en politibetjent.

So:

• politiet = the police / the police force
• en politibetjent = a police officer

That is why politiet in this sentence does not mean one officer.

Omringer is the present tense of the verb å omringe.

• å omringe = to surround
• omringer = surrounds / are surrounding

Norwegian present tense is often made by adding -r to the infinitive:

• å komme → kommer
• å snakke → snakker
• å omringe → omringer

No. In modern Norwegian, verbs do not change for person or number the way they do in English.

So you get:

• jeg omringer = I surround
• du omringer = you surround
• politiet omringer = the police surround(s)
• de omringer = they surround

The verb form omringer stays the same.

Yes. This is the standard subject–verb–object order:

• Politiet = subject
• omringer = verb
• huset = object

So the sentence structure is very straightforward.

But Norwegian is also a V2 language, which means the verb usually stays in the second position in main clauses. For example:

• Nå omringer politiet huset. = Now the police are surrounding the house.

Here Nå comes first, so the verb omringer still has to come second.

Not if you want the same meaning.

Huset omringer politiet would normally mean The house surrounds the police, because Norwegian mainly shows subject and object here through word order, not special case endings.

So:

• Politiet omringer huset = The police surround the house
• Huset omringer politiet = The house surrounds the police

Word order matters a lot.

It is capitalized only because it is the first word of the sentence.

Norwegian does not capitalize all nouns like German does.

So in the middle of a sentence, you would write:

• Jeg ser at politiet omringer huset.

Yes, usually.

Omringe suggests surrounding something on all sides, often in an active or strategic way. It is a strong, deliberate verb.

So Politiet omringer huset sounds more like:

• they have surrounded it
• they have it encircled
• they may be blocking escape

If you just wanted to say they are physically around the house, that could be less strong.

A rough pronunciation is:

poo-lee-TEE-eh om-RING-er HOO-seh

A few notes:

• politiet has four syllables
• the stress is mainly on -TEE-
• omringer is stressed on RING
• huset is often pronounced with a very weak final -t, or no clear t at all, depending on dialect

Pronunciation varies across Norway, but that approximation is a good start.