Vi repar i replokalen efter jobbet.

Here, repar is the present tense of the informal verb repa, which means to rehearse.

It is especially common when talking about bands, musicians, or theatre groups.

So:

Vi repar = We rehearse / We’re rehearsing

A more formal verb you may also see is repetera.

No. It only looks similar.

In Swedish, to repair is usually reparera.

In this sentence, repar comes from repa = to rehearse, not to repair.

So this is a classic false-friend situation for English speakers.

They are close, but not identical.

• öva = to practice
• repa = to rehearse

Öva is broader and can mean practicing a skill in general.
Repa is more specifically about rehearsing, often together with others, especially for music or performance.

So in a band context, repar sounds very natural.

Replokalen means the rehearsal room or the rehearsal space.

It comes from:

• rep = short for rehearsal-related language
• lokal = room, premises, space

So:

• replokal = rehearsal room / rehearsal space
• replokalen = the rehearsal room / the rehearsal space

This is a very common word in music contexts.

In Swedish, the definite article is often added to the end of the noun instead of being a separate word.

For example:

• replokal = rehearsal room

• replokalen = the rehearsal room

• jobb = job / work
• jobbet = the job / the work

So the English word the is often built into the noun in Swedish.

Because i is the normal preposition for being in an enclosed place such as a room or building.

So:

• i replokalen = in the rehearsal room

This is about location, not movement.
If the sentence were about going into the room, Swedish might use something like in i replokalen, but here it just describes where the rehearsing happens.

Because efter jobbet is the natural, idiomatic way to say after work or after the workday.

Even though jobbet literally looks like the job, the whole phrase works like an everyday time expression.

So:

• efter jobbet = after work / after the working day

Efter jobb would sound unnatural or incomplete in normal Swedish.

Not necessarily.

Swedish present tense can be used for several things:

• something happening now
• something that happens regularly
• a planned future event

So Vi repar i replokalen efter jobbet could mean:

• We rehearse in the rehearsal room after work
• We’re rehearsing in the rehearsal room after work
• We rehearse there after work today

The exact meaning depends on context.

Yes, but Swedish follows an important rule in main clauses: the finite verb usually stays in second position.

Original sentence:

Vi repar i replokalen efter jobbet.

If you move Efter jobbet to the front, you get:

Efter jobbet repar vi i replokalen.

Notice that repar still comes second. That is a very important Swedish word-order pattern.

In normal Swedish, you usually need to include the subject.

So Vi repar i replokalen efter jobbet is the normal full sentence.

Leaving out vi would usually sound incomplete, unless it is a very informal note, message, or headline-style language.

So yes, in ordinary speech and writing, vi is needed.