Usable floor space in a resident's sleeping room is calculated by measuring from interior wall surface to interior wall surface:
(a) Areas under moveable furniture; and
(b) Areas of door swings and entryways into the sleeping room.
(a) Areas under ceilings less than seven feet six inches high;
(b) Closet space and built-in storage;
(c) Areas under counters, sinks, or appliances; and
(d) Bathrooms and toilet rooms.
[Statutory Authority: RCW 18.20.090 (2004 c 142 § 19) and chapter 18.20 RCW. 04-16-065, § 388-78A-3020, filed 7/30/04, effective 9/1/04.]