Spanish · Pronunciation Guide
lah KAH-sah — the s stays a clean hiss, not the z of English "Casa".
Two syllables — CA-sa — with the stress on the first, straight from the default rule. The plural "casas" keeps it. Note the near-twin "caza" (hunt) is pronounced identically in Latin American Spanish, since z and s merge — one of the few places where seseo creates a genuine homophone pair.
Listen: la casa
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Voy a casa ahora.
I'm going home now.
Listen: Voy a casa ahora.
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"Voy a casa ahora" drops the article, which Spanish does with "casa" when it means home rather than a specific house — "voy a la casa" would point at a particular building. "Ahora" has a silent h in the middle, so its vowels run together.
English speakers voice the s exactly as they do in the borrowed word "casa", turning it into a z. Spanish hisses it. Both a vowels then want differentiating, when they should be identical and wide open. And the article rule is worth internalising early: "a casa" means homeward, "a la casa" means to the house.