House Design With No Internal Dividing Walls

This page is the CodyCross answer for the clue below from Life on Wheels, Group 1785, Puzzle 5 (Catalytic Converter).

Question is: House Design With No Internal Dividing Walls

and the answer is: OPENPLAN

Word Meaning:

OPEN — (usually not comparable) Physically unobstructed, uncovered, etc.

Definitions from Wiktionary.