Später wollen wir auch ein kleines Regal im Flur montieren.

Später means later. German often puts a time expression first to set the scene.

So:

• Später = later
• wollen wir = we want to / we intend to
• rest of the sentence = what we want to do

Starting with Später gives it emphasis: Later, we also want to mount/put up a small shelf in the hallway.

When a different element comes first in a German main clause, the verb still has to stay in the second position, which is why you get Später wollen wir... and not Später wir wollen...

Because German main clauses follow the V2 rule: the finite verb must be in the second position.

If the sentence began with the subject, it would be:

• Wir wollen später auch ein kleines Regal im Flur montieren.

But since Später is moved to the front, the verb must come next:

• Später wollen wir auch ein kleines Regal im Flur montieren.

So the order is:

1. Später
2. wollen
3. wir

This is very normal German word order.

Yes, wollen basically means to want.

Here, wir wollen ... montieren means:

• we want to mount ...
• depending on context, also we intend to mount ...
• or we’re going to mount ... later

In everyday German, wollen can sometimes sound a bit stronger than English want, but in planning contexts it often simply expresses intention.

So in this sentence, it likely means something like:

• Later, we also plan to put up a small shelf in the hallway.

Because wollen is a modal verb, and with modal verbs in German, the other verb usually goes to the end in the infinitive.

Pattern:

• subject + modal verb + ... + infinitive

Examples:

• Wir wollen gehen. = We want to go.
• Sie kann Deutsch sprechen. = She can speak German.
• Später wollen wir ... montieren. = Later we want to mount ...

So montieren stays in its basic infinitive form and appears at the end.

Ein kleines Regal is in the accusative case because it is the direct object of montieren.

They are mounting what?

• ein kleines Regal

Also, Regal is a neuter noun: das Regal

So in nominative and accusative singular, the article is:

• ein Regal

The adjective ending in this phrase is -es:

• ein kleines Regal

That happens because:

• Regal is neuter
• singular
• accusative
• and it follows ein

Because adjective endings in German depend on:

• gender
• case
• article type

Here:

• Regal is neuter
• the phrase is accusative singular
• the article is ein

For a neuter noun after ein in the nominative or accusative singular, the adjective usually ends in -es:

• ein kleines Regal
• ein neues Auto
• ein schönes Haus

So kleines matches the grammar of Regal.

Auch means also or too.

In this sentence, it suggests that mounting the shelf is another thing the speakers want to do:

• Später wollen wir auch ein kleines Regal im Flur montieren.
• Later, we also want to mount a small shelf in the hallway.

Its position can shift depending on what is being emphasized, but here it naturally modifies the whole action or adds this plan to other plans already mentioned.

For example:

• Wir wollen auch ein kleines Regal montieren. = We also want to mount a small shelf.
• Wir wollen ein kleines Regal auch im Flur montieren. = less natural here, and the emphasis changes

So the placement of auch is important for nuance.

Because im Flur means in the hallway in the sense of location.

German uses:

• dative for location: where?
• accusative for direction/movement toward somewhere: where to?

Here, the shelf will be mounted in the hallway as a location, so German uses dative:

• im Flur = in dem Flur = in the hallway

If the sentence were about movement into the hallway, you would use accusative:

• in den Flur gehen = to go into the hallway

So:

• wo? where? → im Flur
• wohin? to where? → in den Flur

Yes. Im is a contraction of:

• in dem → im

This is very common in German.

Examples:

• im Flur = in the hallway
• im Zimmer = in the room
• im Garten = in the garden

German frequently contracts certain preposition + article combinations:

• an dem → am
• in dem → im
• zu dem → zum
• zu der → zur

So im Flur is the normal way to say it.

Montieren often means to mount, install, or attach something. Depending on context, it can sometimes also mean assemble.

In this sentence, because the object is ein kleines Regal, likely meanings are:

• mount a small shelf
• put up a small shelf
• possibly install a small shelf

If the shelf is being built from parts, German might also use:

• aufbauen = set up / assemble
• zusammenbauen = put together / assemble

So montieren here strongly suggests fixing or installing the shelf in place.

Yes. German word order is flexible, as long as the main grammar rules are respected.

For example, these are possible:

• Wir wollen später auch ein kleines Regal im Flur montieren.
• Auch wollen wir später ein kleines Regal im Flur montieren.
  This is grammatical but less natural in everyday speech.
• Ein kleines Regal wollen wir später auch im Flur montieren.
  This gives strong emphasis to ein kleines Regal.

The most neutral versions are usually:

• Später wollen wir auch ein kleines Regal im Flur montieren.
• Wir wollen später auch ein kleines Regal im Flur montieren.

A natural understanding would be something like:

• Later, we also want to put up a small shelf in the hallway.
• Later, we’re also planning to install a small shelf in the hallway.

The sentence sounds like part of a larger plan, for example when talking about furnishing or organizing a home. The word auch suggests there are other things being done as well.