Við göngum upp að húsinu.

Because göngum is the 1st person plural present tense form of the verb að ganga (to walk).

• að ganga = the infinitive, like English to walk
• ég geng = I walk
• við göngum = we walk

So the subject við (we) requires the verb form göngum.

This is a common pattern in Icelandic: the verb changes depending on the subject.

Við means we.

It is the 1st person plural pronoun. In this sentence:

• Við = we
• göngum = walk / are walking

So Við göngum means we walk or we are walking, depending on context.

Icelandic often includes the subject pronoun clearly, especially in simple learner-style sentences like this one.

Upp að here means something like up to or toward a place, especially as you approach it on foot.

It is best understood as a unit in this sentence:

• upp = up
• að = to / toward / up to

Together, upp að húsinu means up to the house.

In natural English, you may not always translate upp separately. Depending on context, the whole phrase could be understood as:

• up to the house
• toward the house
• over to the house

The exact nuance depends on the situation.

Not always.

Upp often does suggest upward movement, but in combinations like upp að, it can also feel more idiomatic, meaning up to a place rather than strictly higher in elevation.

So this sentence may mean:

• you are literally walking uphill toward the house, or
• you are simply approaching the house, with upp að as the natural expression used

Context tells you how literal upp is.

Because the preposition að takes the dative case, and the noun is also definite (the house, not just a house).

The base noun is:

• hús = house

But after að, it must be in the dative singular:

• húsi = to a house / at a house
• húsinu = to the house / at the house

So:

• að húsi = to a house
• að húsinu = to the house

That is why húsinu appears in this sentence.

The ending -inu includes the definite article and the dative singular ending for a neuter noun.

Icelandic usually puts the at the end of the noun instead of using a separate word.

So:

• hús = house
• húsi = house (dative singular, indefinite)
• húsinu = the house (dative singular, definite)

In other words, -nu here is part of the built-on definite article, and the whole form shows both:

• case: dative
• definiteness: the

Yes, you could.

Við göngum að húsinu would mean we walk to/toward the house.

Adding upp gives a slightly different nuance, often:

• up to the house
• right up to the house
• movement with a sense of approach, sometimes upward

So both are possible, but upp að húsinu is a bit more specific in feeling than just að húsinu.

Yes.

Icelandic present tense often covers both ideas that English separates:

• we walk
• we are walking

So Við göngum upp að húsinu could mean either:

• We walk up to the house
  or
• We are walking up to the house

The broader context tells you which is meant.

The dictionary form is að ganga.

This is the infinitive, meaning to walk. Icelandic dictionaries usually list verbs with að:

• að ganga = to walk

From that verb you get forms such as:

• ég geng = I walk
• þú gengur = you walk
• við göngum = we walk

So when you see göngum, you should connect it back to að ganga.

A rough pronunciation guide for an English speaker might be:

• Við ≈ vith
• göngum ≈ GURN-gum or GON-gum with a rounded vowel not found exactly in English
• upp ≈ oop
• að ≈ ath (with a voiced th sound, like in this)
• húsinu ≈ HOO-si-nu

A few useful notes:

• ð is often like the th in this
• ú is like oo
• ö is a rounded front vowel; English does not have an exact match
• stress usually falls on the first syllable in Icelandic words

So the sentence is stressed roughly like this:

VIÐ GÖNG-um UPP að HÚS-i-nu

Yes, Icelandic word order is somewhat flexible, but Við göngum upp að húsinu is the most straightforward neutral order.

This is:

• Við = subject
• göngum = verb
• upp að húsinu = adverbial/prepositional phrase

In other contexts, Icelandic may move elements for emphasis or because of normal sentence patterns, but for a basic declarative sentence, this order is very natural and standard.

For a learner, this sentence is a good model to follow.