Is the grammar of sentence The house is not as cheap he thought right?

The grammar of the sentence "The house is not as cheap he thought" is incorrect.

Here's why:

* Missing Pronoun: The sentence is missing a pronoun after "as cheap." It should be "as cheap as he thought." The word "as" is needed to complete the comparison.

Here's the corrected sentence:

The house is not as cheap as he thought.