[Bonka]

Do you know if your parents want custom made furniture and drapes? Because if they're looking to furnish the space with mainly off-the-shelf items you're probably better off with an interior decorator. Otherwise, expect to pay for it: a custom made 3-seat sofa with a medium/high end designer fabric label can go into the 5-figure range.

Here are a few namedrops on well known designers in Vancouver that might match your parent's style more and you would be working with them directly.

Lin Heppner
Audrey Topliss
Seoris Harrison
Tina Wei
Cathy Howden

Also you are more likely to work with an associate with big firms like Kelly Deck and Juli Hodgson, if that could be an issue.

Ultimately, it depends on the budget and if you want custom made pieces. Designers all upcharge differently so any budget can get eaten up with their fees: they can charge by the hour, they can charge a designer fee, they'll put a markup on the materials (ie: fabric) you use, etc.