Learn Hardcore Norwegian: Et ekstra rom gjør huset større.

gjør is the present tense of the verb gjøre (“to make” or “to do”). Here it translates as “makes” – so the sentence means “An extra room makes the house bigger.”

Why is it et ekstra rom and not det ekstra rommet?

Because you’re talking about any extra room (indefinite), not a specific one. rom is a neuter noun, so the indefinite article is et. Use det ekstra rommet only when you mean “that extra room” (definite).

How do you form the comparative større from stor?

stor means “big.” To make the comparative, you add -re and change o to ø, giving større (“bigger”). Many adjectives in Norwegian form comparatives by adding -ere, but stor is irregular.

Could you say mer stor instead of større?

No. Some adjectives use mer + adjective (like mer interessant), but stor has its own comparative større. mer stor would be ungrammatical.

Why use gjør instead of blir in gjør huset større?

gjør means “make” (cause), whereas blir means “become” (change of state). Et ekstra rom gjør huset større emphasizes the extra room as the cause. You could say ”huset blir større” (“the house becomes bigger”), but that focuses on the result, not the cause.

What is the word order in Et ekstra rom gjør huset større?

Norwegian generally follows Subject–Verb–Object order. Here:

Subject: Et ekstra rom
Verb: gjør
Object: huset
Object complement (predicate adjective): større

Why is rom neuter and how does that affect the article?

In Norwegian, each noun has a grammatical gender (masculine, feminine or neuter). rom is neuter, so its indefinite singular article is et (→ et rom) and its definite form is rommet (→ rommet = “the room”).