L'architetto arriva per il sopralluogo.

Because Italian often shortens the article before a vowel.

Here, architetto starts with a-, so the full article changes to l':

• lo architetto would not be used
• instead, Italian says l'architetto

So l'architetto means the architect.

Usually, yes: architetto is traditionally the masculine form.

The feminine form is often architetta. However, in real usage, some speakers also use architetto for a woman, especially as a professional title.

So in many learning contexts, you can understand l'architetto here as the architect, while noting that the traditional grammatical form is masculine.

Arriva is the third-person singular present indicative of arrivare.

That means it corresponds to:

• he/she arrives
• is arriving
• sometimes even will arrive, depending on context

In this sentence, it most naturally means the architect arrives / is arriving.

Because Italian uses the simple present much more broadly than English.

So arriva can cover both:

• arrives
• is arriving

Italian does have a progressive form:

• sta arrivando = is arriving

But very often, plain arriva is the normal and natural choice.

Here per expresses purpose or reason.

So arriva per il sopralluogo means that the architect arrives for the site inspection, or in order to carry out the inspection.

It does not mean through or by here. It means something like:

• for
• for the purpose of
• in connection with

Because Italian often uses the definite article where English might not.

Il sopralluogo means the site inspection. In context, this usually refers to a specific, expected inspection.

So per il sopralluogo sounds natural as:

• for the site inspection
• for the inspection

Without the article, the phrase would usually sound less natural in an ordinary sentence.

Sopralluogo is a fairly specific word. It usually means an on-site inspection, site visit, or walkthrough.

It is common in areas like:

• architecture
• construction
• real estate
• engineering
• insurance

So it is more specific than a general visit. It suggests going to a place in order to inspect, assess, or examine it.

This is the normal, straightforward Italian order:

subject + verb + complement

• L'architetto = subject
• arriva = verb
• per il sopralluogo = purpose phrase

Italian can change word order for emphasis, for example:

• Per il sopralluogo arriva l'architetto

But the original sentence is the most neutral and standard way to say it.

Sometimes, but the meaning changes slightly.

• arrivare focuses on reaching the destination
• venire focuses more on coming toward a place or person

So:

• L'architetto arriva = The architect arrives
• L'architetto viene = The architect comes

Both can be possible in the right context, but arriva is specifically about the act of arriving.

A useful point here is that Italian double consonants are pronounced more strongly than single ones.

In this sentence:

• architetto has tt
• arriva has rr
• sopralluogo has ll

That means you should give those consonants a clear, slightly longer sound.

A rough pronunciation guide:

• l'architetto ≈ lar-kee-TET-to
• arriva ≈ ar-REE-va
• sopralluogo ≈ so-pra-LLWO-go

You do not need to exaggerate them too much, but they should be noticeable.