Esta casa es demasiado pequeña.

English Translation

This house is far too small.

Why not “demasiada” since casa is feminine?

‘Demasiado’ is an adverb. Adverbs are invariable. You can tell it’s an adverb because it modifies an adjective (pequeña).

Demasiadas casas (adj + noun)
Demasiado pequeñas (adv + adj).

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