Het expertiserapport noemt de nieuwwaarde.

Het is the definite article for a het-word in Dutch, so here it means the.

The noun is het expertiserapport = the assessment report / expert report.

In Dutch, every singular noun takes either:

• de
• het

You usually have to learn this together with the noun:

• het rapport
• therefore het expertiserapport

Because expertiserapport is singular and definite, het is required here.

Dutch very often forms compound nouns by writing them as a single word.

So:

• expertise = expertise, assessment
• rapport = report
• expertiserapport = expert report / assessment report

This is very normal in Dutch. Where English often uses separate words, Dutch often combines them:

• schoolboek
• ziekenhuis
• belastingformulier

The last part usually carries the core meaning. In expertiserapport, the main noun is rapport, so the whole word means a kind of report.

In Dutch compounds, the last word determines the grammatical gender and article.

Here, the last part is rapport, and that noun is a het-word:

• het rapport

So the full compound is also a het-word:

• het expertiserapport

This is a very useful rule for compounds:

• de tafel → de keukentafel
• het huis → het zomerhuis
• het rapport → het expertiserapport

Noemen often means to call / to name, but in this sentence it more naturally means something like:

• mentions
• states
• gives
• lists

So Het expertiserapport noemt de nieuwwaarde means that the report mentions or states the new/replacement value.

This is a common thing in Dutch: a verb may have a basic meaning you first learn, but in context it can have a broader sense.

Compare:

• Hij noemt haar slim. = He calls her smart.
• Het artikel noemt drie oorzaken. = The article mentions three causes.

So here, noemt is not really about giving something a name.

Dutch main clauses usually follow the verb-second rule (V2).

That means the finite verb comes in the second slot:

• Het expertiserapport noemt de nieuwwaarde.

Structure:

• 1st slot: Het expertiserapport
• 2nd slot: noemt
• then the rest: de nieuwwaarde

This stays true even if something else comes first:

• In het rapport noemt men de nieuwwaarde.
• Vandaag noemt het expertiserapport de nieuwwaarde.

So English speakers often notice this because Dutch word order is stricter in this respect than English.

Because the subject is singular:

• het expertiserapport = it / the report

In the present tense, Dutch uses:

• ik noem
• jij noemt
• hij/zij/het noemt
• wij/jullie/zij noemen

So:

• Het expertiserapport noemt ...

If the subject were plural, you would use noemen:

• De expertiserapporten noemen de nieuwwaarde.

Nieuwwaarde is a compound noun:

• nieuw = new
• waarde = value

Together, it means something like:

• new value
• often more specifically replacement value in insurance, valuation, or assessment contexts

It is the value of something as new, not its current used value.

This is a technical or formal word, and you often see it in reports, insurance documents, and appraisals.

Because it is formed from:

• nieuw
• waarde

When Dutch joins these into a compound, both parts stay visible:

• nieuw + waarde = nieuwwaarde

So the w at the end of nieuw and the w at the start of waarde both remain.

This may look unusual to an English speaker, but it is normal Dutch compound spelling.

Because the main noun here is waarde, and waarde is a de-word:

• de waarde

So the compound is also a de-word:

• de nieuwwaarde

Again, the last part of the compound decides the article:

• de waarde
• therefore de nieuwwaarde

Normally, no. In standard Dutch, you would usually need the article:

• Het expertiserapport noemt de nieuwwaarde.

That is because nieuwwaarde is being used as a regular singular countable noun referring to a specific value.

Leaving out the article would sound unnatural in ordinary Dutch, unless it were part of a special note style, heading, or highly technical shorthand.

So for normal sentence building, use:

• de nieuwwaarde

It sounds fairly formal or technical because of the nouns:

• expertiserapport
• nieuwwaarde

These are words you are more likely to see in:

• insurance documents
• valuations
• legal or administrative texts
• professional reports

The grammar itself is completely normal, but the vocabulary belongs more to formal written Dutch than casual conversation.