Después de que la electricista revise la luz del pasillo, pintaremos también el pasamanos.

In standard Spanish, the normal structure is después de que + verb.

• después de que la electricista revise... = after the electrician checks...

Using después que without de is much less standard and is not what learners should usually copy.

A useful comparison:

• después de que + conjugated verb
• después de + infinitive / noun

For example:

• Después de que llegue, salimos. = After he/she arrives, we leave.
• Después de llegar, salimos. = After arriving, we leave.

Because después de que often triggers the subjunctive when the action is still in the future or has not happened yet.

In this sentence, the electrician has not checked the hallway light yet. The checking is a future event relative to the speaker, so Spanish uses the present subjunctive:

• revise

Not:

• revisa (present indicative)
• revisará (future)

This is a very common pattern:

• Después de que vengas, comemos.
• Después de que termine, te llamo.

If the event is seen as already completed in the past, Spanish normally uses the indicative:

• Después de que revisó la luz, pintamos el pasamanos.

Because it comes from the verb revisar, and here it matches the present subjunctive form for ella / usted:

• yo: revise
• tú: revises
• él/ella/usted: revise
• nosotros: revisemos
• vosotros: reviséis
• ellos/ellas/ustedes: revisen

The indicative would be:

• él/ella/usted: revisa

So:

• la electricista revise = subjunctive
• la electricista revisa = indicative

Yes, if the subject is understood to be the same or clear from context.

• Después de que la electricista revise la luz del pasillo, pintaremos también el pasamanos.
• Después de revisar la luz del pasillo, pintaremos también el pasamanos.

But there is an important difference:

• después de que + finite verb clearly states who does the action
• después de + infinitive is more compact and often leaves the subject implicit

In your sentence, using después de que la electricista revise... is helpful because it clearly says that the electrician is the one checking the light.

Exactly. Many Spanish nouns ending in -ista are the same for both genders, and the article tells you whether the person is male or female:

• el electricista = the male electrician
• la electricista = the female electrician

Other common examples:

• el/la dentista
• el/la periodista
• el/la turista

So electricista itself does not change; only the article changes.

Because de + el contracts to del in Spanish.

So:

• de el pasillo → del pasillo

This contraction is mandatory, except when El is part of a proper name:

• el libro del profesor
• la foto del coche

But:

• de El Escorial stays de El Escorial

Here, la luz del pasillo simply means the hallway light or the light in the corridor.

Pintaremos is the simple future: we will paint.

It is used here because the painting will happen after the electrician checks the light, so the action is clearly in the future.

Spanish could also use other future expressions, depending on style and context:

• pintaremos = we will paint
• vamos a pintar = we’re going to paint
• sometimes even present tense in context: después..., pintamos...

But pintaremos is perfectly natural and clear. It sounds a little more direct and planned than some present-tense alternatives.

Here también means also / as well, and it adds the idea that the handrail will be painted in addition to something else already mentioned or understood.

So the sentence suggests something like:

• We will also paint the handrail.

Its position is flexible in Spanish, but placement can slightly change the emphasis:

• Pintaremos también el pasamanos.
• También pintaremos el pasamanos.

Both are natural. In your sentence, también sits close to el pasamanos, which makes that item feel like the added element.

No, it is singular here. Pasamanos is one of those Spanish nouns that ends in -s even in the singular.

So:

• el pasamanos = the handrail / banister
• los pasamanos = the handrails

This can confuse learners because many plural nouns also end in -s, but not every word ending in -s is plural.

Other examples of singular nouns ending in -s include:

• el paraguas
• el lunes
• la crisis

Usually not in this kind of sentence. This is a classic false friend.

Here revisar means something like:

• to check
• to inspect
• to examine
• to look over

So la electricista revise la luz means the electrician checks or inspects the light.

If an English speaker sees revise, they may think of editing text or studying again, but in Spanish revisar is much broader and often means check.

Because the sentence begins with a subordinate clause:

• Después de que la electricista revise la luz del pasillo, ...

Then the main clause follows:

• ... pintaremos también el pasamanos.

In Spanish, when a longer subordinate clause comes first, using a comma before the main clause is normal and helpful. It works much like English:

• After the electrician checks the hallway light, we’ll also paint the handrail.

If the order were reversed, the comma would often disappear:

• Pintaremos también el pasamanos después de que la electricista revise la luz del pasillo.

Not with exactly the same meaning.

• después de que = after
• cuando = when

So:

• Después de que la electricista revise la luz del pasillo, pintaremos también el pasamanos.
  = The painting happens after the checking.

• Cuando la electricista revise la luz del pasillo, pintaremos también el pasamanos.
  = More like when the electrician checks it; this can sound more general or time-based, and in some contexts less explicitly sequential.

Both can take the subjunctive for future reference, but después de que is better if you want to stress that one action happens only once the other has been completed.

Because la luz del pasillo is the natural noun phrase: the hallway light.

Spanish usually keeps the noun together with its complement:

• la luz del pasillo
• la puerta de la cocina
• el techo del baño

Putting del pasillo before la luz would sound unnatural here.

So the structure is:

• revise = verb
• la luz del pasillo = direct object

This is the most normal word order.