Here are few simple/clean concepts with strong symbolism!
Entries #103, #104 and #105 in one or another form utilize key (as symbol of entrance to interior space) and letter "Q", so that logo icon, even detached from text part, might be used as recognizable stand alone mark,...this is handy in numerous occasions (printing, or web). On entry #104, I've also combined house element, to give it more obvious feel!
Entry #106 is different and combines symbolic tape measure (as interior designer, I also know how important this tool is,...:) ), and inner space corner! Logo icon also forms recognizable letter "Q". This might probably be the best branding solution, I've offered so far!
Hope you'll like some of these, and if you have some suggestions for improvement (colors, layouts, fonts, etc.), feel free to let me know!