A word for “house” in the Qenya Lexicon of the 1910s under the early root ᴱ√IŘI [IÐI] “dwell” (QL/43). It also appeared in the contemporaneous Poetic and Mythological Words of Eldarissa (PME/43).
Early Quenya
mardo
noun. dweller
indo
noun. house
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun appearing as ᴱQ. mardo “dweller” in the Qenya Lexicon of the 1910s, apparently an agental form of ᴱQ. mar “dwelling” (QL/60).
Neo-Quenya: Since Q. mar(da) “dwelling” appears in Tolkien’s later writing (PE17/64, 107), I would keep ᴺQ. mardo “dweller” as well.