Månedsleien er høy.

Månedsleien means the monthly rent.

It is a compound noun:

• måned = month
• leie = rent
• månedsleie = monthly rent
• månedsleien = the monthly rent

So the -n at the end makes it definite: the monthly rent, not just monthly rent.

That -s- is a linking s, which is very common in Norwegian compound words.

So:

• måned
  • leie becomes månedsleie

This -s- does not usually have a separate meaning by itself. It just helps connect the parts of the compound in a natural way.

You will see this in many other words too.

In Norwegian, nouns often show definiteness by adding an ending.

For many masculine/common-gender singular nouns, the definite form ends in -en.

Here:

• månedsleie = monthly rent
• månedsleien = the monthly rent

So instead of putting a separate word like the in front, Norwegian usually adds the definite ending directly to the noun.

Leie is usually treated as a feminine or masculine/common-gender noun in Bokmål, depending on style and usage.

That means you may see:

• ei leie / leia
• or en leie / leien

In your sentence, månedsleien uses the -en definite ending, so it is being treated in the common-gender/masculine-style form.

Both systems are normal in Bokmål for many nouns.

The adjective changes depending on what noun it describes.

Here, månedsleien is singular and not neuter, so the adjective is:

• høy = singular common gender form

Compare:

• Leien er høy. = The rent is high.
• Beløpet er høyt. = The amount is high.
  (beløp is neuter, so høyt)
• Prisene er høye. = The prices are high.
  (plural, so høye)

So høy is correct because it agrees with månedsleien.

Because høy is used predicatively here, after the verb er.

In Norwegian, adjectives behave differently depending on where they appear:

• attributive: before a noun
  
  • den høye månedsleien = the high monthly rent
• predicative: after a verb like er
  
  • Månedsleien er høy = The monthly rent is high

After er, the adjective does not take the definite form. It just agrees in gender and number.

Er means is / are / am, depending on context. It is the present tense of å være = to be.

In this sentence:

• Månedsleien er høy.
• The monthly rent is high.

So the structure is very straightforward:

• subject
  • verb
    • adjective

Yes, in this sentence it is very similar to English.

Norwegian:

• Månedsleien = subject
• er = verb
• høy = adjective

So:

• Månedsleien er høy.
• The monthly rent is high.

This is a normal basic sentence pattern in Norwegian.

Yes. Den månedlige leien er høy is also correct and means essentially the same thing.

There are two common ways to express this idea:

1. Compound noun

   • månedsleien
   • literally something like month-rent-the
   • very natural in Norwegian

2. Adjective + noun

   • den månedlige leien
   • the monthly rent

The compound form is often very natural and compact in Norwegian.

A rough guide is:

• måned: the å sounds somewhat like the vowel in British law
• leien: the ei often sounds like the i in English mine
• høy has a vowel sound that English does not really have, followed by something like y

A very rough approximation for an English speaker might be:

• MOH-neds-lie-en er hoi

But that is only approximate. The hardest parts are usually:

• å in måned
• øy in høy

If you want to sound more natural, those vowel sounds are worth practicing.

Yes. Leie can have several related meanings depending on context, including:

• rent
• hire
• rental
• sometimes the act of renting something

In månedsleie, the meaning is clearly monthly rent.

So context matters, but in this sentence the meaning is unambiguous.

Yes, absolutely. Månedsleien er høy is natural and idiomatic Norwegian.

It sounds like something you might say when talking about:

• apartments
• housing costs
• student accommodation
• office space

It is a short, normal everyday sentence.